我的书签
添加书签
移除书签- (see
#columnfor usage) #drop_column#rename_column(the first argument is the old name, while the second is the new name)#add_index(see#indexfor usage)#add_primary_key(see#primary_keyfor usage)#add_foreign_key(see for usage)#add_constraint(see#constraintfor usage)#drop_constraint(accepts the name of the constraint as argument)#add_unique_constraint#set_column_default(accepts the name of the column and the default value as comma separated args)#set_column_type(accepts the name of the column and the new type as comma separated args)#set_column_not_null(accepts the name of the column)
- To add a unique constraint use
add_unique_constraint(:column_name)
Some methods can be used without block. Those methods accept the name of the target table as first argument, then the other args.
#add_column#drop_column#rename_column#add_index#drop_index#set_column_type
Tables can be renamed via #rename_table. It accepts the old name and the new name as arguments.
Safe operation can be performed via #drop_table?. It drops the table only if it exists.
