查询¶

Query()¶

参数

[collection] «Object» Mongoose collection

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

示例

const query = MyModel.find();
query.setOptions({ lean : true });
query.collection(model.collection);
query.where('age').gte(21).exec(callback);

const query = new mongoose.Query();

Query.prototype.use$geoWithin¶

Flag to opt out of using $geoWithin.

mongoose.Query.use$geoWithin = false;

MongoDB 2.4 deprecated the use of $within, replacing it with $geoWithin. Mongoose uses $geoWithin by default (which is 100% backward compatible with $within). If you are running an older version of MongoDB, set this flag to false so your within() queries continue to work.

Query.prototype.toConstructor()¶

返回

«Query» subclass-of-Query

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

示例

var query = Movie.find({ tags: 'adventure' }).read('primaryPreferred');

var Adventure = query.toConstructor();

Adventure().exec(callback)

Adventure().where({ name: /^Life/ }).exec(callback);

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)

New in 3.7.3

Query.prototype.$where()¶

参数

js «String,Function» javascript string or function

返回

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

示例

query.$where('this.comments.length === 10 || this.name.length === 5')

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

注释

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.where()¶

参数

返回

Specifies a path for use with chaining.

示例

User.find({age: {$gte: 21, $lte: 65}}, callback);

User.where('age').gte(21).lte(65);

User.find().where({ name: 'vonderful' })

User
.where('age').gte(21).lte(65)
.where('name', /^vonderful/i)
.where('friends').slice(10)
.exec(callback)

Query.prototype.equals()¶

参数

返回

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

示例

User.where('age').equals(49);

User.where('age', 49);

Query.prototype.or()¶

参数

array «Array» array of conditions

返回

Specifies arguments for an $or condition.

示例

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

Query.prototype.nor()¶

参数

array «Array» array of conditions

返回

Specifies arguments for a $nor condition.

示例

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

Query.prototype.and()¶

参数

array «Array» array of conditions

返回

Specifies arguments for a $and condition.

示例

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