示例1，查询

示例2，分页

func Paginate(r *ghttp.Request) func(m *gdb.Model) *gdb.Model {
    return func(m *gdb.Model) *gdb.Model {
        type Pagination struct {
            Page int
            Size int
        _ = r.Parse(&pagination)
        switch {
        case pagination.Size > 100:
            pagination.Size = 100
        }
        return m.Page(pagination.Page, pagination.Size)
    }
}