Query

Connection

Model

• Query()
• Query.prototype.Symbol.asyncIterator()
• Query.prototype.allowDiskUse()
• Query.prototype.batchSize()
• Query.prototype.cast()
• Query.prototype.center()
• Query.prototype.circle()
• Query.prototype.comment()
• Query.prototype.countDocuments()
• Query.prototype.deleteMany()
• Query.prototype.distinct()
• Query.prototype.equals()
• Query.prototype.estimatedDocumentCount()
• Query.prototype.exists()
• Query.prototype.find()
• Query.prototype.findOneAndDelete()
• Query.prototype.findOneAndReplace()
• Query.prototype.geometry()
• Query.prototype.getFilter()
• Query.prototype.getPopulatedPaths()
• Query.prototype.getUpdate()
• Query.prototype.gte()
• Query.prototype.in()
• Query.prototype.j()
• Query.prototype.limit()
• Query.prototype.lte()
• Query.prototype.maxDistance()
• Query.prototype.maxTimeMS()
• Query.prototype.merge()
• Query.prototype.model
• Query.prototype.ne()
• Query.prototype.nearSphere()
• Query.prototype.nor()
• Query.prototype.orFail()
• Query.prototype.populate()
• Query.prototype.pre()
• Query.prototype.read()
• Query.prototype.regex()
• Query.prototype.replaceOne()
• Query.prototype.selected()
• Query.prototype.selectedInclusively()
• Query.prototype.set()
• Query.prototype.setQuery()
• Query.prototype.size()
• Query.prototype.slaveOk()
• Query.prototype.snapshot()
• Query.prototype.tailable()
• Query.prototype.toConstructor()
• Query.prototype.updateMany()
• Query.prototype.use$geoWithin
• Query.prototype.where()
• Query.prototype.writeConcern()

QueryCursor

AggregationCursor

Virtualtype

Array

DocumentArrayPath

• Query()
• Query.prototype.Symbol.asyncIterator()
• Query.prototype.allowDiskUse()
• Query.prototype.batchSize()
• Query.prototype.cast()
• Query.prototype.center()
• Query.prototype.circle()
• Query.prototype.comment()
• Query.prototype.countDocuments()
• Query.prototype.deleteMany()
• Query.prototype.distinct()
• Query.prototype.equals()
• Query.prototype.estimatedDocumentCount()
• Query.prototype.exists()
• Query.prototype.find()
• Query.prototype.findOneAndDelete()
• Query.prototype.findOneAndReplace()
• Query.prototype.geometry()
• Query.prototype.getFilter()
• Query.prototype.getPopulatedPaths()
• Query.prototype.gt()
• Query.prototype.hint()
• Query.prototype.intersects()
• Query.prototype.lean()
• Query.prototype.lt()
• Query.prototype.map()
• Query.prototype.maxScan()
• Query.prototype.maxscan()
• Query.prototype.mod()
• Query.prototype.mongooseOptions()
• Query.prototype.near()
• Query.prototype.nin()
• Query.prototype.or()
• Query.prototype.polygon()
• Query.prototype.post()
• Query.prototype.projection()
• Query.prototype.readConcern()
• Query.prototype.remove()
• Query.prototype.select()
• Query.prototype.selectedExclusively()
• Query.prototype.session()
• Query.prototype.setOptions()
• Query.prototype.setUpdate()
• Query.prototype.skip()
• Query.prototype.slice()
• Query.prototype.sort()
• Query.prototype.then()
• Query.prototype.update()
• Query.prototype.updateOne()
• Query.prototype.w()
• Query.prototype.within()
• Query.prototype.wtimeout()

Parameters

• [options] «Object»
• [model] «Object»
• [conditions] «Object»
• [collection] «Object» Mongoose collection

Query constructor used for building queries. You do not need to instantiate a directly. Instead use Model functions like Model.find().

Example:

Parameters

• js «String|Function» javascript string or function

Returns:

• «Query» this

Specifies a javascript function or expression to pass to MongoDBs query system.

Example

query.$where('this.comments.length === 10 || this.name.length === 5')
// or
query.$where(function () {
  return this.comments.length === 10 || this.name.length === 5;
})

NOTE:

Only use $where when you have a condition that cannot be met using other MongoDB operators like $lt. Be sure to read about all of its caveats before using.

Query.prototype.Symbol.asyncIterator()

Returns an asyncIterator for use with This function only works for find() queries. You do not need to call this function explicitly, the JavaScript runtime will call it for you.

Example

for await (const doc of Model.aggregate([{ $sort: { name: 1 } }])) {
  console.log(doc.name);
}

Node.js 10.x supports async iterators natively without any flags. You can enable async iterators in Node.js 8.x using the .

Note: This function is not if Symbol.asyncIterator is undefined. If Symbol.asyncIterator is undefined, that means your Node.js version does not support async iterators.

Parameters

• [path] «String»
• val «Array»

Specifies an $all query condition.

When called with one argument, the most recent path passed to where() is used.

Example:

MyModel.find().where('pets').all(['dog', 'cat', 'ferret']);
// Equivalent:
MyModel.find().all('pets', ['dog', 'cat', 'ferret']);

Parameters

• [v] «Boolean» Enable/disable allowDiskUse. If called with 0 arguments, sets allowDiskUse: true

Returns:

• «Query» this

Sets the allowDiskUse option, which allows the MongoDB server to use more than 100 MB for this query’s sort(). This option can let you work around QueryExceededMemoryLimitNoDiskUseAllowed errors from the MongoDB server.

Note that this option requires MongoDB server >= 4.4. Setting this option is a no-op for MongoDB 4.2 and earlier.

Calling query.allowDiskUse(v) is equivalent to query.setOptions({ allowDiskUse: v })

Example:

await query.find().sort({ name: 1 }).allowDiskUse(true);
// Equivalent:
await query.find().sort({ name: 1 }).allowDiskUse();

Parameters

• array «Array» array of conditions

Returns:

• «Query» this

Specifies arguments for a $and condition.

Example

query.and([{ color: 'green' }, { status: 'ok' }])

Query.prototype.batchSize()

Parameters

• val «Number»

Specifies the batchSize option.

Example

query.batchSize(100)

Note

Cannot be used with distinct()

Parameters

• val «Object»
• Upper «[Array]» Right Coords

Returns:

• «Query» this

Specifies a $box condition

Example

const lowerLeft = [40.73083, -73.99756]
const upperRight= [40.741404,  -73.988135]
query.where('loc').within().box(lowerLeft, upperRight)
query.box({ ll : lowerLeft, ur : upperRight })

Query.prototype.cast()

Parameters

• [model] «Model» the model to cast to. If not set, defaults to this.model

• [obj] «Object»

Returns:

• «Object»

Casts this query to the schema of model

Note

If obj is present, it is cast instead of this query.

Parameters

• [reject] «Function»

Returns:

• «Promise»

Executes the query returning a Promise which will be resolved with either the doc(s) or rejected with the error. Like .then(), but only takes a rejection handler.

More about Promise catch() in JavaScript.

Query.prototype.center()

DEPRECATED Alias for

Deprecated. Use circle instead.

Query.prototype.centerSphere()

Parameters

• [path] «String»
• val «Object»

Returns:

• «Query» this

DEPRECATED Specifies a $centerSphere condition

Deprecated. Use instead.

Example

const area = { center: [50, 50], radius: 10 };
query.where('loc').within().centerSphere(area);

Query.prototype.circle()

Parameters

• [path] «String»
• area «Object»

Returns:

• «Query» this

Specifies a $center or $centerSphere condition.

Example

const area = { center: [50, 50], radius: 10, unique: true }
query.where('loc').within().circle(area)
// alternatively
query.circle('loc', area);
// spherical calculations
const area = { center: [50, 50], radius: 10, unique: true, spherical: true }
query.where('loc').within().circle(area)
// alternatively
query.circle('loc', area);

Parameters

• value «Object»

Returns:

• «Query» this

Adds a collation to this op (MongoDB 3.4 and up)

Parameters

• val «String»

Specifies the comment option.

Example

query.comment('login query')

Note

Cannot be used with distinct()

Query.prototype.count()

Parameters

• [filter] «Object» count documents that match this object

• [callback] «Function» optional params are (error, count)

Returns:

• «Query» this

Specifies this query as a count query.

This method is deprecated. If you want to count the number of documents in a collection, e.g. count({}), use the instead. Otherwise, use the countDocuments() function instead.

Passing a callback executes the query.

This function triggers the following middleware.

• count()

Example:

const countQuery = model.where({ 'color': 'black' }).count();
query.count({ color: 'black' }).count(callback)
query.count({ color: 'black' }, callback)
query.where('color', 'black').count(function (err, count) {
  if (err) return handleError(err);
  console.log('there are %d kittens', count);
})

Parameters

• [filter] «Object» mongodb selector

• [callback] «Function» optional params are (error, count)

Returns:

• «Query» this

Specifies this query as a countDocuments() query. Behaves like count(), except it always does a full collection scan when passed an empty filter {}.

There are also minor differences in how countDocuments() handles $where and a couple geospatial operators. versus count().

Passing a callback executes the query.

This function triggers the following middleware.

• countDocuments()

Example:

const countQuery = model.where({ 'color': 'black' }).countDocuments();
query.countDocuments({ color: 'black' }).count(callback);
query.countDocuments({ color: 'black' }, callback);
query.where('color', 'black').countDocuments(function(err, count) {
  if (err) return handleError(err);
  console.log('there are %d kittens', count);
});

The countDocuments() function is similar to count(), but there are a few operators that countDocuments() does not support. Below are the operators that count() supports but countDocuments() does not, and the suggested replacement:

• $where:
• $near: $geoWithin with
• $nearSphere: $geoWithin with

Parameters

• [options] «Object»

Returns:

• «QueryCursor»

Returns a wrapper around a mongodb driver cursor. A QueryCursor exposes a Streams3 interface, as well as a .next() function.

The .cursor() function triggers pre find hooks, but not post find hooks.

Example

// There are 2 ways to use a cursor. First, as a stream:
Thing.
  find({ name: /^hello/ }).
  cursor().
  on('data', function(doc) { console.log(doc); }).
  on('end', function() { console.log('Done!'); });
// Or you can use `.next()` to manually get the next doc in the stream.
// `.next()` returns a promise, so you can use promises or callbacks.
const cursor = Thing.find({ name: /^hello/ }).cursor();
cursor.next(function(error, doc) {
  console.log(doc);
});
// Because `.next()` returns a promise, you can use co
// to easily iterate through all documents without loading them
// all into memory.
co(function*() {
  const cursor = Thing.find({ name: /^hello/ }).cursor();
  for (let doc = yield cursor.next(); doc != null; doc = yield cursor.next()) {
    console.log(doc);
  }
});

Valid options

• transform: optional function which accepts a mongoose document. The return value of the function will be emitted on data and returned by .next().

Query.prototype.deleteMany()

Parameters

• [filter] «Object|Query» mongodb selector

• [options] «Object» optional see Query.prototype.setOptions()

• [callback] «Function» optional params are (error, mongooseDeleteResult)

Returns:

• «Query» this

Declare and/or execute this query as a deleteMany() operation. Works like remove, except it deletes every document that matches filter in the collection, regardless of the value of single.

This function triggers deleteMany middleware.

Example

await Character.deleteMany({ name: /Stark/, age: { $gte: 18 } });
// Using callbacks:
Character.deleteMany({ name: /Stark/, age: { $gte: 18 } }, callback);

This function calls the MongoDB driver’s . The returned promise resolves to an object that contains 3 properties:

• ok: 1 if no errors occurred
• deletedCount: the number of documents deleted
• n: the number of documents deleted. Equal to deletedCount.

Example

const res = await Character.deleteMany({ name: /Stark/, age: { $gte: 18 } });
// `0` if no docs matched the filter, number of docs deleted otherwise
res.deletedCount;

Parameters

• [filter] «Object|Query» mongodb selector

• [options] «Object» optional see

• [callback] «Function» optional params are (error, mongooseDeleteResult)

Returns:

• «Query» this

Declare and/or execute this query as a deleteOne() operation. Works like remove, except it deletes at most one document regardless of the single option.

This function triggers deleteOne middleware.

Example

await Character.deleteOne({ name: 'Eddard Stark' });
// Using callbacks:
Character.deleteOne({ name: 'Eddard Stark' }, callback);

This function calls the MongoDB driver’s Collection#deleteOne() function. The returned resolves to an object that contains 3 properties:

• ok: 1 if no errors occurred
• deletedCount: the number of documents deleted
• n: the number of documents deleted. Equal to deletedCount.

Example

const res = await Character.deleteOne({ name: 'Eddard Stark' });
// `1` if MongoDB deleted a doc, `0` if no docs matched the filter `{ name: ... }`
res.deletedCount;

Query.prototype.distinct()

Parameters

• [field] «String»
• [filter] «Object|Query»
• [callback] «Function» optional params are (error, arr)

Returns:

• «Query» this

Declares or executes a distinct() operation.

Passing a callback executes the query.

This function does not trigger any middleware.

Example

distinct(field, conditions, callback)
distinct(field, conditions)
distinct(field, callback)
distinct(field)
distinct(callback)
distinct()

Parameters

• path «String|Object|Function»
• filter «Object|Function»

Returns:

• «Query» this

Specifies an $elemMatch condition

Example

query.elemMatch('comment', { author: 'autobot', votes: {$gte: 5}})
query.where('comment').elemMatch({ author: 'autobot', votes: {$gte: 5}})
query.elemMatch('comment', function (elem) {
  elem.where('author').equals('autobot');
  elem.where('votes').gte(5);
})
query.where('comment').elemMatch(function (elem) {
  elem.where({ author: 'autobot' });
  elem.where('votes').gte(5);
})

Query.prototype.equals()

Parameters

• val «Object»

Returns:

• «Query» this

Specifies the complementary comparison value for paths specified with where()

Example

User.where('age').equals(49);
// is the same as
User.where('age', 49);

Parameters

• err «Error|null» if set, exec() will fail fast before sending the query to MongoDB

Returns:

• «Query» this

Gets/sets the error flag on this query. If this flag is not null or undefined, the exec() promise will reject without executing.

Example:

Query().error(); // Get current error value
Query().error(null); // Unset the current error
Query().error(new Error('test')); // `exec()` will resolve with test
Schema.pre('find', function() {
  if (!this.getQuery().userId) {
    this.error(new Error('Not allowed to query without setting userId'));
  }
});

Note that query casting runs after hooks, so cast errors will override custom errors.

Example:

const TestSchema = new Schema({ num: Number });
const TestModel = db.model('Test', TestSchema);
TestModel.find({ num: 'not a number' }).error(new Error('woops')).exec(function(error) {
  // `error` will be a cast error because `num` failed to cast
});

Parameters

• [options] «Object» passed transparently to the

• [callback] «Function» optional params are (error, count)

Returns:

• «Query» this

Specifies this query as a estimatedDocumentCount() query. Faster than using countDocuments() for large collections because estimatedDocumentCount() uses collection metadata rather than scanning the entire collection.

estimatedDocumentCount() does not accept a filter. Model.find({ foo: bar }).estimatedDocumentCount() is equivalent to Model.find().estimatedDocumentCount()

This function triggers the following middleware.

• estimatedDocumentCount()

Example:

await Model.find().estimatedDocumentCount();

Parameters

• [operation] «String|Function»
• [callback] «Function» optional params depend on the function being called

Returns:

• «Promise»

Executes the query

Examples:

const promise = query.exec();
const promise = query.exec('update');
query.exec(callback);
query.exec('find', callback);

Query.prototype.exists()

Parameters

• [path] «String»
• val «Boolean»

Returns:

• «Query» this

Specifies an $exists condition

Example

// { name: { $exists: true }}
Thing.where('name').exists()
Thing.where('name').exists(true)
Thing.find().exists('name')
// { name: { $exists: false }}
Thing.where('name').exists(false);
Thing.find().exists('name', false);

Parameters

• [verbose] «String» The verbosity mode. Either ‘queryPlanner’, ‘executionStats’, or ‘allPlansExecution’. The default is ‘queryPlanner’

Returns:

• «Query» this

Sets the explain option, which makes this query return detailed execution stats instead of the actual query result. This method is useful for determining what index your queries use.

Calling query.explain(v) is equivalent to query.setOptions({ explain: v })

Example:

const query = new Query();
const res = await query.find({ a: 1 }).explain('queryPlanner');
console.log(res);

Parameters

• [filter] «Object|ObjectId» mongodb selector. If not specified, returns all documents.

• [callback] «Function»

Returns:

• «Query» this

Find all documents that match selector. The result will be an array of documents.

If there are too many documents in the result to fit in memory, use Query.prototype.cursor()

Example

// Using async/await
const arr = await Movie.find({ year: { $gte: 1980, $lte: 1989 } });
// Using callbacks
Movie.find({ year: { $gte: 1980, $lte: 1989 } }, function(err, arr) {});

Parameters

• [filter] «Object» mongodb selector

• [projection] «Object» optional fields to return

• [options] «Object» see

• [callback] «Function» optional params are (error, document)

Returns:

• «Query» this

Declares the query a findOne operation. When executed, the first found document is passed to the callback.

Passing a callback executes the query. The result of the query is a single document.

• Note: conditions is optional, and if conditions is null or undefined, mongoose will send an empty findOne command to MongoDB, which will return an arbitrary document. If you’re querying by _id, use Model.findById() instead.

This function triggers the following middleware.

• findOne()

Example

const query  = Kitten.where({ color: 'white' });
query.findOne(function (err, kitten) {
  if (err) return handleError(err);
  if (kitten) {
    // doc may be null if no document matched
  }
});

Parameters

• [conditions] «Object»

• [options] «Object»

• [options.rawResult] «Boolean» if true, returns the

• [options.session=null] «ClientSession» The session associated with this query. See transactions docs.

• [options.strict] «Boolean|String» overwrites the schema’s

• [callback] «Function» optional params are (error, document)

Returns:

• «Query» this

Issues a MongoDB command.

Finds a matching document, removes it, and passes the found document (if any) to the callback. Executes if callback is passed.

This function triggers the following middleware.

• findOneAndDelete()

This function differs slightly from Model.findOneAndRemove() in that findOneAndRemove() becomes a MongoDB findAndModify() command, as opposed to a findOneAndDelete() command. For most mongoose use cases, this distinction is purely pedantic. You should use findOneAndDelete() unless you have a good reason not to.

Available options

• sort: if multiple docs are found by the conditions, sets the sort order to choose which doc to update
• maxTimeMS: puts a time limit on the query - requires mongodb >= 2.6.0
• rawResult: if true, resolves to the raw result from the MongoDB driver

Callback Signature

function(error, doc) {
  // error: any errors that occurred
  // doc: the document before updates are applied if `new: false`, or after updates if `new = true`
}

Examples

A.where().findOneAndDelete(conditions, options, callback) // executes
A.where().findOneAndDelete(conditions, options)  // return Query
A.where().findOneAndDelete(conditions, callback) // executes
A.where().findOneAndDelete(conditions) // returns Query
A.where().findOneAndDelete(callback)   // executes
A.where().findOneAndDelete()           // returns Query

Query.prototype.findOneAndRemove()

Parameters

• [conditions] «Object»

• [options] «Object»

• [options.rawResult] «Boolean» if true, returns the raw result from the MongoDB driver

• [options.session=null] «ClientSession» The session associated with this query. See .

• [options.strict] «Boolean|String» overwrites the schema’s strict mode option

• [callback] «Function» optional params are (error, document)

Returns:

• «Query» this

Issues a mongodb findAndModify remove command.

Finds a matching document, removes it, passing the found document (if any) to the callback. Executes if callback is passed.

This function triggers the following middleware.

• findOneAndRemove()

Available options

• sort: if multiple docs are found by the conditions, sets the sort order to choose which doc to update
• maxTimeMS: puts a time limit on the query - requires mongodb >= 2.6.0
• rawResult: if true, resolves to the raw result from the MongoDB driver

Callback Signature

function(error, doc) {
  // error: any errors that occurred
  // doc: the document before updates are applied if `new: false`, or after updates if `new = true`
}

Examples

A.where().findOneAndRemove(conditions, options, callback) // executes
A.where().findOneAndRemove(conditions, options)  // return Query
A.where().findOneAndRemove(conditions, callback) // executes
A.where().findOneAndRemove(conditions) // returns Query
A.where().findOneAndRemove(callback)   // executes
A.where().findOneAndRemove()           // returns Query

Query.prototype.findOneAndReplace()

Parameters

• [filter] «Object»
• [replacement] «Object»

• [options.rawResult] «Boolean» if true, returns the raw result from the MongoDB driver

• [options.session=null] «ClientSession» The session associated with this query. See .

• [options.strict] «Boolean|String» overwrites the schema’s strict mode option

• [options.new=false] «Boolean» By default, findOneAndUpdate() returns the document as it was before update was applied. If you set new: true, findOneAndUpdate() will instead give you the object after update was applied.

• [options.lean] «Object» if truthy, mongoose will return the document as a plain JavaScript object rather than a mongoose document. See and the Mongoose lean tutorial.

• [options.session=null] «ClientSession» The session associated with this query. See .

• [options.strict] «Boolean|String» overwrites the schema’s strict mode option

• [options.omitUndefined=false] «Boolean» If true, delete any properties whose value is undefined when casting an update. In other words, if this is set, Mongoose will delete baz from the update in Model.updateOne({}, { foo: 'bar', baz: undefined }) before sending the update to the server.

• [options.timestamps=null] «Boolean» If set to false and are enabled, skip timestamps for this update. Note that this allows you to overwrite timestamps. Does nothing if schema-level timestamps are not set.

• [options.returnOriginal=null] «Boolean» An alias for the new option. returnOriginal: false is equivalent to new: true.

• [callback] «Function» optional params are (error, document)

Returns:

• «Query» this

Issues a MongoDB command.

Finds a matching document, removes it, and passes the found document (if any) to the callback. Executes if callback is passed.

This function triggers the following middleware.

• findOneAndReplace()

Available options

• sort: if multiple docs are found by the conditions, sets the sort order to choose which doc to update
• maxTimeMS: puts a time limit on the query - requires mongodb >= 2.6.0
• rawResult: if true, resolves to the

Callback Signature

function(error, doc) {
  // error: any errors that occurred
  // doc: the document before updates are applied if `new: false`, or after updates if `new = true`
}

Examples

Parameters

• [filter] «Object|Query»
• [doc] «Object»

• [options] «Object»

• [options.rawResult] «Boolean» if true, returns the

• [options.strict] «Boolean|String» overwrites the schema’s strict mode option

• [options.session=null] «ClientSession» The session associated with this query. See .

• [options.multipleCastError] «Boolean» by default, mongoose only returns the first error that occurred in casting the query. Turn on this option to aggregate all the cast errors.

• [options.new=false] «Boolean» By default, findOneAndUpdate() returns the document as it was before update was applied. If you set new: true, findOneAndUpdate() will instead give you the object after update was applied.

• [options.lean] «Object» if truthy, mongoose will return the document as a plain JavaScript object rather than a mongoose document. See Query.lean() and .

• [options.session=null] «ClientSession» The session associated with this query. See transactions docs.

• [options.strict] «Boolean|String» overwrites the schema’s

• [options.omitUndefined=false] «Boolean» If true, delete any properties whose value is undefined when casting an update. In other words, if this is set, Mongoose will delete baz from the update in Model.updateOne({}, { foo: 'bar', baz: undefined }) before sending the update to the server.

• [options.timestamps=null] «Boolean» If set to false and schema-level timestamps are enabled, skip timestamps for this update. Note that this allows you to overwrite timestamps. Does nothing if schema-level timestamps are not set.

• [options.returnOriginal=null] «Boolean» An alias for the new option. returnOriginal: false is equivalent to new: true.

• [callback] «Function» optional params are (error, doc), unless rawResult is used, in which case params are (error, writeOpResult)

Returns:

• «Query» this

Issues a mongodb findAndModify update command.

Finds a matching document, updates it according to the update arg, passing any options, and returns the found document (if any) to the callback. The query executes if callback is passed.

This function triggers the following middleware.

• findOneAndUpdate()

Available options

• new: bool - if true, return the modified document rather than the original. defaults to false (changed in 4.0)
• upsert: bool - creates the object if it doesn’t exist. defaults to false.
• fields: {Object|String} - Field selection. Equivalent to .select(fields).findOneAndUpdate()
• sort: if multiple docs are found by the conditions, sets the sort order to choose which doc to update
• maxTimeMS: puts a time limit on the query - requires mongodb >= 2.6.0
• runValidators: if true, runs update validators on this command. Update validators validate the update operation against the model’s schema.
• setDefaultsOnInsert: if this and upsert are true, mongoose will apply the specified in the model’s schema if a new document is created. This option only works on MongoDB >= 2.4 because it relies on MongoDB’s $setOnInsert operator.
• rawResult: if true, returns the
• (string) if set to ‘query’ and runValidators is on, this will refer to the query in custom validator functions that update validation runs. Does nothing if runValidators is false.

Callback Signature

function(error, doc) {
  // error: any errors that occurred
  // doc: the document before updates are applied if `new: false`, or after updates if `new = true`
}

Examples

query.findOneAndUpdate(conditions, update, options, callback) // executes
query.findOneAndUpdate(conditions, update, options)  // returns Query
query.findOneAndUpdate(conditions, update, callback) // executes
query.findOneAndUpdate(conditions, update)           // returns Query
query.findOneAndUpdate(update, callback)             // returns Query
query.findOneAndUpdate(update)                       // returns Query
query.findOneAndUpdate(callback)                     // executes
query.findOneAndUpdate()                             // returns Query

Parameters

• object «Object» Must contain a type property which is a String and a coordinates property which is an Array. See the examples.

Returns:

• «Query» this

Specifies a $geometry condition

Example

const polyA = [[[ 10, 20 ], [ 10, 40 ], [ 30, 40 ], [ 30, 20 ]]]
query.where('loc').within().geometry({ type: 'Polygon', coordinates: polyA })
// or
const polyB = [[ 0, 0 ], [ 1, 1 ]]
query.where('loc').within().geometry({ type: 'LineString', coordinates: polyB })
// or
const polyC = [ 0, 0 ]
query.where('loc').within().geometry({ type: 'Point', coordinates: polyC })
// or
query.where('loc').intersects().geometry({ type: 'Point', coordinates: polyC })

The argument is assigned to the most recent path passed to where().

NOTE:

geometry() must come after either intersects() or within().

The object argument must contain type and coordinates properties. - type {String} - coordinates {Array}

Parameters

• path «String|Object» path or object of key/value pairs to get

Returns:

• «Query» this

For update operations, returns the value of a path in the update’s $set. Useful for writing getters/setters that can work with both update operations and save().

Example:

const query = Model.updateOne({}, { $set: { name: 'Jean-Luc Picard' } });
query.get('name'); // 'Jean-Luc Picard'

Query.prototype.getFilter()

Returns:

• «Object» current query filter

Returns the current query filter (also known as conditions) as a POJO.

Example:

const query = new Query();
query.find({ a: 1 }).where('b').gt(2);
query.getFilter(); // { a: 1, b: { $gt: 2 } }

Returns:

• «Object» the options

Gets query options.

Example:

const query = new Query();
query.limit(10);
query.setOptions({ maxTimeMS: 1000 })
query.getOptions(); // { limit: 10, maxTimeMS: 1000 }

Returns:

• «Array» an array of strings representing populated paths

Gets a list of paths to be populated by this query

Example:

bookSchema.pre('findOne', function() {
   let keys = this.getPopulatedPaths(); // ['author']
 });
 ...
 Book.findOne({}).populate('author');

Example:

// Deep populate
 const q = L1.find().populate({
   path: 'level2',
   populate: { path: 'level3' }
 });
 q.getPopulatedPaths(); // ['level2', 'level2.level3']

Query.prototype.getQuery()

Returns:

• «Object» current query filter

Returns the current query filter. Equivalent to getFilter().

You should use getFilter() instead of getQuery() where possible. getQuery() will likely be deprecated in a future release.

Example:

const query = new Query();
query.find({ a: 1 }).where('b').gt(2);
query.getQuery(); // { a: 1, b: { $gt: 2 } }

Query.prototype.getUpdate()

Returns:

• «Object» current update operations

Returns the current update operations as a JSON object.

Example:

const query = new Query();
query.update({}, { $set: { a: 5 } });
query.getUpdate(); // { $set: { a: 5 } }

Query.prototype.gt()

Parameters

• [path] «String»
• val «Number»

Specifies a $gt query condition.

When called with one argument, the most recent path passed to where() is used.

Example

Thing.find().where('age').gt(21)
// or
Thing.find().gt('age', 21)

Query.prototype.gte()

Parameters

• [path] «String»
• val «Number»

Specifies a $gte query condition.

When called with one argument, the most recent path passed to where() is used.

Parameters

• val «Object» a hint object

Returns:

• «Query» this

Sets query hints.

Example

query.hint({ indexA: 1, indexB: -1})

Note

Cannot be used with distinct()

Parameters

• [path] «String»
• val «Array»

Specifies an $in query condition.

When called with one argument, the most recent path passed to where() is used.

Query.prototype.intersects()

Parameters

• [arg] «Object»

Returns:

• «Query» this

Declares an intersects query for geometry().

Example

query.where('path').intersects().geometry({
    type: 'LineString'
  , coordinates: [[180.0, 11.0], [180, 9.0]]
})
query.where('path').intersects({
    type: 'LineString'
  , coordinates: [[180.0, 11.0], [180, 9.0]]
})

NOTE:

MUST be used after where().

NOTE:

In Mongoose 3.7, intersects changed from a getter to a function. If you need the old syntax, use this.

Query.prototype.j()

Parameters

• val «boolean»

Returns:

• «Query» this

Requests acknowledgement that this operation has been persisted to MongoDB’s on-disk journal.

• deleteOne()
• deleteMany()
• findOneAndDelete()
• findOneAndReplace()
• findOneAndUpdate()
• remove()
• update()
• updateOne()
• updateMany()

Defaults to the schema’s

Example:

await mongoose.model('Person').deleteOne({ name: 'Ned Stark' }).j(true);

Query.prototype.lean()

Parameters

• bool «Boolean|Object» defaults to true

Returns:

• «Query» this

Sets the lean option.

Documents returned from queries with the lean option enabled are plain javascript objects, not . They have no save method, getters/setters, virtuals, or other Mongoose features.

Example:

new Query().lean() // true
new Query().lean(true)
new Query().lean(false)
const docs = await Model.find().lean();
docs[0] instanceof mongoose.Document; // false

, especially when combined with cursors.

If you need virtuals, getters/setters, or defaults with lean(), you need to use a plugin. See:

• mongoose-lean-getters

Parameters

• val «Number»

Specifies the maximum number of documents the query will return.

Example

query.limit(20)

Note

Cannot be used with distinct()

Query.prototype.lt()

Parameters

• [path] «String»
• val «Number»

Specifies a $lt query condition.

When called with one argument, the most recent path passed to where() is used.

Parameters

• [path] «String»
• val «Number»

Specifies a $lte query condition.

When called with one argument, the most recent path passed to where() is used.

Query.prototype.map()

Parameters

• fn «Function» function to run to transform the query result

Returns:

• «Query» this

Runs a function fn and treats the return value of fn as the new value for the query to resolve to.

Any functions you pass to map() will run after any post hooks.

Example:

const res = await MyModel.findOne().map(res => {
  // Sets a `loadedAt` property on the doc that tells you the time the
  // document was loaded.
  return res == null ?
    res :
    Object.assign(res, { loadedAt: new Date() });
});

Parameters

• [path] «String»
• val «Number»

Specifies a maxDistance query condition.

When called with one argument, the most recent path passed to where() is used.

Query.prototype.maxScan()

Parameters

• val «Number»

Specifies the maxScan option.

Example

query.maxScan(100)

Note

Cannot be used with distinct()

Parameters

• [ms] «Number» The number of milliseconds

Returns:

• «Query» this

Sets the maxTimeMS option. This will tell the MongoDB server to abort if the query or write op has been running for more than ms milliseconds.

Calling query.maxTimeMS(v) is equivalent to query.setOptions({ maxTimeMS: v })

Example:

const query = new Query();
// Throws an error 'operation exceeded time limit' as long as there's
// >= 1 doc in the queried collection
const res = await query.find({ $where: 'sleep(1000) || true' }).maxTimeMS(100);

DEPRECATED Alias of maxScan

Parameters

• source «Query|Object»

Returns:

• «Query» this

Merges another Query or conditions object into this one.

When a Query is passed, conditions, field selection and options are merged.

Parameters

• [path] «String»
• val «Array» must be of length 2, first element is divisor, 2nd element is remainder.

Returns:

• «Query» this

Specifies a $mod condition, filters documents for documents whose path property is a number that is equal to remainder modulo divisor.

Example

// All find products whose inventory is odd
Product.find().where('inventory').mod([2, 1]);
// This syntax is a little strange, but supported.
Product.find().where('inventory').mod(2, 1);

Query.prototype.model

Type:

• «property»

The model this query is associated with.

Example:

const q = MyModel.find();
q.model === MyModel; // true

Query.prototype.mongooseOptions()

Parameters

• options «Object» if specified, overwrites the current options

Returns:

• «Object» the options

Getter/setter around the current mongoose-specific options for this query Below are the current Mongoose-specific options.

• populate: an array representing what paths will be populated. Should have one entry for each call to
• lean: if truthy, Mongoose will not hydrate any documents that are returned from this query. See for more information.
• strict: controls how Mongoose handles keys that aren’t in the schema for updates. This option is true by default, which means Mongoose will silently strip any paths in the update that aren’t in the schema. See the strict mode docs for more information.
• strictQuery: controls how Mongoose handles keys that aren’t in the schema for the query filter. This option is false by default for backwards compatibility, which means Mongoose will allow Model.find({ foo: 'bar' }) even if foo is not in the schema. See the for more information.
• useFindAndModify: used to work around the findAndModify() deprecation warning
• omitUndefined: delete any properties whose value is undefined when casting an update. In other words, if this is set, Mongoose will delete baz from the update in Model.updateOne({}, { foo: 'bar', baz: undefined }) before sending the update to the server.
• nearSphere: use $nearSphere instead of near(). See the

Mongoose maintains a separate object for internal options because Mongoose sends Query.prototype.options to the MongoDB server, and the above options are not relevant for the MongoDB server.

Parameters

• [path] «String»
• val «any»

Specifies a $ne query condition.

When called with one argument, the most recent path passed to where() is used.

Query.prototype.near()

Parameters

• [path] «String»
• val «Object»

Returns:

• «Query» this

Specifies a $near or $nearSphere condition

These operators return documents sorted by distance.

Example

query.where('loc').near({ center: [10, 10] });
query.where('loc').near({ center: [10, 10], maxDistance: 5 });
query.where('loc').near({ center: [10, 10], maxDistance: 5, spherical: true });
query.near('loc', { center: [10, 10], maxDistance: 5 });

DEPRECATED Specifies a $nearSphere condition

Example

query.where('loc').nearSphere({ center: [10, 10], maxDistance: 5 });

Deprecated. Use query.near() instead with the spherical option set to true.

Example

query.where('loc').near({ center: [10, 10], spherical: true });

Parameters

• [path] «String»
• val «Array»

Specifies an $nin query condition.

When called with one argument, the most recent path passed to where() is used.

Query.prototype.nor()

Parameters

• array «Array» array of conditions

Returns:

• «Query» this

Specifies arguments for a $nor condition.

Example

query.nor([{ color: 'green' }, { status: 'ok' }])

Parameters

• array «Array» array of conditions

Returns:

• «Query» this

Specifies arguments for an $or condition.

Example

query.or([{ color: 'red' }, { status: 'emergency' }])

Query.prototype.orFail()

Parameters

• [err] «Function|Error» optional error to throw if no docs match filter. If not specified, orFail() will throw a DocumentNotFoundError

Returns:

• «Query» this

Make this query throw an error if no documents match the given filter. This is handy for integrating with async/await, because orFail() saves you an extra if statement to check if no document was found.

Example:

// Throws if no doc returned
await Model.findOne({ foo: 'bar' }).orFail();
// Throws if no document was updated
await Model.updateOne({ foo: 'bar' }, { name: 'test' }).orFail();
// Throws "No docs found!" error if no docs match `{ foo: 'bar' }`
await Model.find({ foo: 'bar' }).orFail(new Error('No docs found!'));
// Throws "Not found" error if no document was found
await Model.findOneAndUpdate({ foo: 'bar' }, { name: 'test' }).
  orFail(() => Error('Not found'));

Parameters

• [path] «String|Array»

• [coordinatePairs…] «Array|Object»

Returns:

• «Query» this

Specifies a $polygon condition

Example

query.where('loc').within().polygon([10,20], [13, 25], [7,15])
query.polygon('loc', [10,20], [13, 25], [7,15])

Parameters

• path «Object|String» either the path to populate or an object specifying all parameters

• [select] «Object|String» Field selection for the population query

• [model] «Model» The model you wish to use for population. If not specified, populate will look up the model by the name in the Schema’s ref field.

• [match] «Object» Conditions for the population query

• [options] «Object» Options for the population query (sort, etc)

• [options.path=null] «String» The path to populate.

• [options.retainNullValues=false] «boolean» by default, Mongoose removes null and undefined values from populated arrays. Use this option to make populate() retain null and undefined array entries.

• [options.getters=false] «boolean» if true, Mongoose will call any getters defined on the localField. By default, Mongoose gets the raw value of localField. For example, you would need to set this option to true if you wanted to add a lowercase getter to your localField.

• [options.clone=false] «boolean» When you do BlogPost.find().populate('author'), blog posts with the same author will share 1 copy of an author doc. Enable this option to make Mongoose clone populated docs before assigning them.

• [options.match=null] «Object|Function» Add an additional filter to the populate query. Can be a filter object containing , or a function that returns a filter object.

• [options.transform=null] «Function» Function that Mongoose will call on every populated document that allows you to transform the populated document.

• [options.options=null] «Object» Additional options like limit and lean.

Returns:

• «Query» this

Specifies paths which should be populated with other documents.

Example:

let book = await Book.findOne().populate('authors');
book.title; // 'Node.js in Action'
book.authors[0].name; // 'TJ Holowaychuk'
book.authors[1].name; // 'Nathan Rajlich'
let books = await Book.find().populate({
  path: 'authors',
  // `match` and `sort` apply to the Author model,
  // not the Book model. These options do not affect
  // which documents are in `books`, just the order and
  // contents of each book document's `authors`.
  match: { name: new RegExp('.*h.*', 'i') },
  sort: { name: -1 }
});
books[0].title; // 'Node.js in Action'
// Each book's `authors` are sorted by name, descending.
books[0].authors[0].name; // 'TJ Holowaychuk'
books[0].authors[1].name; // 'Marc Harter'
books[1].title; // 'Professional AngularJS'
// Empty array, no authors' name has the letter 'h'
books[1].authors; // []

Paths are populated after the query executes and a response is received. A separate query is then executed for each path specified for population. After a response for each query has also been returned, the results are passed to the callback.

Parameters

• fn «Function»

Returns:

• «Promise»

Add post middleware to this query instance. Doesn’t affect other queries.

Example:

const q1 = Question.find({ answer: 42 });
q1.post(function middleware() {
  console.log(this.getFilter());
});
await q1.exec(); // Prints "{ answer: 42 }"
// Doesn't print anything, because `middleware()` is only
// registered on `q1`.
await Question.find({ answer: 42 });

Parameters

• fn «Function»

Returns:

• «Promise»

Add pre middleware to this query instance. Doesn’t affect other queries.

Example:

const q1 = Question.find({ answer: 42 });
q1.pre(function middleware() {
  console.log(this.getFilter());
});
await q1.exec(); // Prints "{ answer: 42 }"
// Doesn't print anything, because `middleware()` is only
// registered on `q1`.
await Question.find({ answer: 42 });

Parameters

• arg «Object|null»

Returns:

• «Object» the current projection

Get/set the current projection (AKA fields). Pass null to remove the current projection.

Unlike projection(), the select() function modifies the current projection in place. This function overwrites the existing projection.

Example:

const q = Model.find();
q.projection(); // null
q.select('a b');
q.projection(); // { a: 1, b: 1 }
q.projection({ c: 1 });
q.projection(); // { c: 1 }
q.projection(null);
q.projection(); // null

Query.prototype.read()

Parameters

• pref «String» one of the listed preference options or aliases

• [tags] «Array» optional tags for this query

Returns:

• «Query» this

Determines the MongoDB nodes from which to read.

Preferences:

primary - (default) Read from primary only. Operations will produce an error if primary is unavailable. Cannot be combined with tags.
secondary            Read from secondary if available, otherwise error.
primaryPreferred     Read from primary if available, otherwise a secondary.
secondaryPreferred   Read from a secondary if available, otherwise read from the primary.
nearest              All operations read from among the nearest candidates, but unlike other modes, this option will include both the primary and all secondaries in the random selection.

Aliases

Example:

new Query().read('primary')
new Query().read('p')  // same as primary
new Query().read('primaryPreferred')
new Query().read('pp') // same as primaryPreferred
new Query().read('secondary')
new Query().read('s')  // same as secondary
new Query().read('secondaryPreferred')
new Query().read('sp') // same as secondaryPreferred
new Query().read('nearest')
new Query().read('n')  // same as nearest
// read from secondaries with matching tags
new Query().read('s', [{ dc:'sf', s: 1 },{ dc:'ma', s: 2 }])

Query.prototype.readConcern()

Parameters

• level «String» one of the listed read concern level or their aliases

Returns:

• «Query» this

Sets the readConcern option for the query.

Example:

new Query().readConcern('local')
new Query().readConcern('l')  // same as local
new Query().readConcern('available')
new Query().readConcern('a')  // same as available
new Query().readConcern('majority')
new Query().readConcern('m')  // same as majority
new Query().readConcern('linearizable')
new Query().readConcern('lz') // same as linearizable
new Query().readConcern('snapshot')
new Query().readConcern('s')  // same as snapshot

Read Concern Level:

local         MongoDB 3.2+ The query returns from the instance with no guarantee guarantee that the data has been written to a majority of the replica set members (i.e. may be rolled back).
available     MongoDB 3.6+ The query returns from the instance with no guarantee guarantee that the data has been written to a majority of the replica set members (i.e. may be rolled back).
majority      MongoDB 3.2+ The query returns the data that has been acknowledged by a majority of the replica set members. The documents returned by the read operation are durable, even in the event of failure.
linearizable  MongoDB 3.4+ The query returns data that reflects all successful majority-acknowledged writes that completed prior to the start of the read operation. The query may wait for concurrently executing writes to propagate to a majority of replica set members before returning results.
snapshot      MongoDB 4.0+ Only available for operations within multi-document transactions. Upon transaction commit with write concern "majority", the transaction operations are guaranteed to have read from a snapshot of majority-committed data.

Aliases

l   local
a   available
m   majority
lz  linearizable
s   snapshot

Read more about how to use read concern .

Parameters

• [path] «String»
• val «String|RegExp»

Specifies a $regex query condition.

When called with one argument, the most recent path passed to where() is used.

Query.prototype.remove()

Parameters

• [filter] «Object|Query» mongodb selector

• [callback] «Function» optional params are (error, mongooseDeleteResult)

Returns:

• «Query» this

Declare and/or execute this query as a remove() operation. remove() is deprecated, you should use or deleteMany() instead.

This function does not trigger any middleware

Example

Character.remove({ name: /Stark/ }, callback);

This function calls the MongoDB driver’s Collection#remove() function. The returned resolves to an object that contains 3 properties:

• ok: 1 if no errors occurred
• deletedCount: the number of documents deleted
• n: the number of documents deleted. Equal to deletedCount.

Example

const res = await Character.remove({ name: /Stark/ });
// Number of docs deleted
res.deletedCount;

Note

Calling remove() creates a Mongoose query, and a query does not execute until you either pass a callback, call , or call Query#exec().

// not executed
const query = Character.remove({ name: /Stark/ });
// executed
Character.remove({ name: /Stark/ }).remove(callback);
// executed without a callback
Character.exec();

Query.prototype.replaceOne()

Parameters

• [filter] «Object»

• [doc] «Object» the update command

• [options] «Object»

• [options.multipleCastError] «Boolean» by default, mongoose only returns the first error that occurred in casting the query. Turn on this option to aggregate all the cast errors.

• [options.omitUndefined=false] «Boolean» If true, delete any properties whose value is undefined when casting an update. In other words, if this is set, Mongoose will delete baz from the update in Model.updateOne({}, { foo: 'bar', baz: undefined }) before sending the update to the server.

• [options.strict] «Boolean|String» overwrites the schema’s strict mode option

• [options.upsert=false] «Boolean» if true, and no documents found, insert a new document

• [options.writeConcern=null] «Object» sets the for replica sets. Overrides the schema-level write concern

• [options.timestamps=null] «Boolean» If set to false and are enabled, skip timestamps for this update. Does nothing if schema-level timestamps are not set.

• [callback] «Function» params are (error, writeOpResult)

Returns:

• «Query» this

Declare and/or execute this query as a replaceOne() operation. Same as update(), except MongoDB will replace the existing document and will not accept any operators ($set, etc.)

Note replaceOne will not fire update middleware. Use pre('replaceOne') and post('replaceOne') instead.

Example:

const res = await Person.replaceOne({ _id: 24601 }, { name: 'Jean Valjean' });
res.n; // Number of documents matched
res.nModified; // Number of documents modified

This function triggers the following middleware.

• replaceOne()

Query.prototype.select()

Parameters

• arg «Object|String|Array<String>»

Returns:

• «Query» this

Specifies which document fields to include or exclude (also known as the query “projection”)

When using string syntax, prefixing a path with - will flag that path as excluded. When a path does not have the - prefix, it is included. Lastly, if a path is prefixed with +, it forces inclusion of the path, which is useful for paths excluded at the .

A projection must be either inclusive or exclusive. In other words, you must either list the fields to include (which excludes all others), or list the fields to exclude (which implies all other fields are included). The _id field is the only exception because MongoDB includes it by default.

Example

// include a and b, exclude other fields
query.select('a b');
// Equivalent syntaxes:
query.select(['a', 'b']);
query.select({ a: 1, b: 1 });
// exclude c and d, include other fields
query.select('-c -d');
// Use `+` to override schema-level `select: false` without making the
// projection inclusive.
const schema = new Schema({
  foo: { type: String, select: false },
  bar: String
});
// ...
query.select('+foo'); // Override foo's `select: false` without excluding `bar`
// or you may use object notation, useful when
// you have keys already prefixed with a "-"
query.select({ a: 1, b: 1 });
query.select({ c: 0, d: 0 });

Returns:

• «Boolean»

Determines if field selection has been made.

Query.prototype.selectedExclusively()

Returns:

• «Boolean»

Determines if exclusive field selection has been made.

query.selectedExclusively() // false
query.select('-name')
query.selectedExclusively() // true
query.selectedInclusively() // false

Returns:

• «Boolean»

Determines if inclusive field selection has been made.

query.selectedInclusively() // false
query.select('name')
query.selectedInclusively() // true

Query.prototype.session()

Parameters

• [session] «ClientSession» from await conn.startSession()

Returns:

• «Query» this

Sets the associated with this query. Sessions are how you mark a query as part of a transaction.

Calling session(null) removes the session from this query.

Example:

const s = await mongoose.startSession();
await mongoose.model('Person').findOne({ name: 'Axl Rose' }).session(s);

Parameters

• path «String|Object» path or object of key/value pairs to set

• [val] «Any» the value to set

Returns:

• «Query» this

Adds a $set to this query’s update without changing the operation. This is useful for query middleware so you can add an update regardless of whether you use updateOne(), updateMany(), findOneAndUpdate(), etc.

Example:

// Updates `{ $set: { updatedAt: new Date() } }`
new Query().updateOne({}, {}).set('updatedAt', new Date());
new Query().updateMany({}, {}).set({ updatedAt: new Date() });

Query.prototype.setOptions()

Parameters

• options «Object»

Returns:

• «Query» this

Sets query options. Some options only make sense for certain operations.

Options:

The following options are only for find():

• tailable
• %7D%7D)
• limit
• allowDiskUse
• readPreference
• comment
• maxscan

The following options are only for write operations: update(), updateOne(), updateMany(), replaceOne(), findOneAndUpdate(), and findByIdAndUpdate():

• writeConcern
• : If timestamps is set in the schema, set this option to false to skip timestamps for that particular update. Has no effect if timestamps is not enabled in the schema options.
• omitUndefined: delete any properties whose value is undefined when casting an update. In other words, if this is set, Mongoose will delete baz from the update in Model.updateOne({}, { foo: 'bar', baz: undefined }) before sending the update to the server.
• overwriteDiscriminatorKey: allow setting the discriminator key in the update. Will use the correct discriminator schema if the update changes the discriminator key.
• overwrite: replace the entire document

The following options are only for find(), findOne(), findById(), findOneAndUpdate(), and findByIdAndUpdate():

• lean
• projection
• sanitizeProjection

The following options are only for all operations except update(), updateOne(), updateMany(), remove(), deleteOne(), and deleteMany():

The following options are for findOneAndUpdate() and findOneAndRemove()

• useFindAndModify
• rawResult

The following options are for all operations

• collation
• explain

Query.prototype.setQuery()

Parameters

• new «Object» query conditions

Returns:

• «undefined»

Sets the query conditions to the provided JSON object.

Example:

const query = new Query();
query.find({ a: 1 })
query.setQuery({ a: 2 });
query.getQuery(); // { a: 2 }

Parameters

• new «Object» update operation

Returns:

• «undefined»

Sets the current update operation to new value.

Example:

const query = new Query();
query.update({}, { $set: { a: 5 } });
query.setUpdate({ $set: { b: 6 } });
query.getUpdate(); // { $set: { b: 6 } }

Query.prototype.size()

Parameters

• [path] «String»
• val «Number»

Specifies a $size query condition.

When called with one argument, the most recent path passed to where() is used.

Example

MyModel.where('tags').size(0).exec(function (err, docs) {
  if (err) return handleError(err);
  assert(Array.isArray(docs));
  console.log('documents with 0 tags', docs);
})

Query.prototype.skip()

Parameters

• val «Number»

Specifies the number of documents to skip.

Example

query.skip(100).limit(20)

Note

Cannot be used with distinct()

Parameters

• v «Boolean» defaults to true

Returns:

• «Query» this

DEPRECATED Sets the slaveOk option.

Deprecated in MongoDB 2.2 in favor of read preferences.

Example:

query.slaveOk() // true
query.slaveOk(true)
query.slaveOk(false)

Parameters

• [path] «String»
• val «Number» number/range of elements to slice

Returns:

• «Query» this

Specifies a $slice projection for an array.

Example

query.slice('comments', 5)
query.slice('comments', -5)
query.slice('comments', [10, 5])
query.where('comments').slice(5)
query.where('comments').slice([-10, 5])

Query.prototype.snapshot()

Returns:

• «Query» this

Specifies this query as a snapshot query.

Example

query.snapshot() // true
query.snapshot(true)
query.snapshot(false)

Note

Cannot be used with distinct()

Parameters

• arg «Object|String»

Returns:

• «Query» this

Sets the sort order

If an object is passed, values allowed are asc, desc, ascending, descending, 1, and -1.

If a string is passed, it must be a space delimited list of path names. The sort order of each path is ascending unless the path name is prefixed with - which will be treated as descending.

Example

// sort by "field" ascending and "test" descending
query.sort({ field: 'asc', test: -1 });
// equivalent
query.sort('field -test');

Note

Cannot be used with distinct()

Parameters

• bool «Boolean» defaults to true

• [opts] «Object» options to set

• [opts.numberOfRetries] «Number» if cursor is exhausted, retry this many times before giving up

• [opts.tailableRetryInterval] «Number» if cursor is exhausted, wait this many milliseconds before retrying

Sets the tailable option (for use with capped collections).

Example

query.tailable() // true
query.tailable(true)
query.tailable(false)

Note

Cannot be used with distinct()

Query.prototype.then()

Parameters

• [resolve] «Function»
• [reject] «Function»

Returns:

• «Promise»

Executes the query returning a Promise which will be resolved with either the doc(s) or rejected with the error.

More about .

Returns:

• «Query» subclass-of-Query

Converts this query to a customized, reusable query constructor with all arguments and options retained.

Example

// Create a query for adventure movies and read from the primary
// node in the replica-set unless it is down, in which case we'll
// read from a secondary node.
const query = Movie.find({ tags: 'adventure' }).read('primaryPreferred');
// create a custom Query constructor based off these settings
const Adventure = query.toConstructor();
// Adventure is now a subclass of mongoose.Query and works the same way but with the
// default query parameters and options set.
Adventure().exec(callback)
// further narrow down our query results while still using the previous settings
Adventure().where({ name: /^Life/ }).exec(callback);
// since Adventure is a stand-alone constructor we can also add our own
// helper methods and getters without impacting global queries
Adventure.prototype.startsWith = function (prefix) {
  this.where({ name: new RegExp('^' + prefix) })
  return this;
}
Object.defineProperty(Adventure.prototype, 'highlyRated', {
  get: function () {
    this.where({ rating: { $gt: 4.5 }});
    return this;
  }
})
Adventure().highlyRated.startsWith('Life').exec(callback)