BucketAuto class

$bucketAuto aggregation stage

Stage description

Categorizes incoming documents into a specific number of groups, called buckets, based on a specified expression. Bucket boundaries are automatically determined in an attempt to evenly distribute the documents into the specified number of buckets.

Each bucket is represented as a document in the output. The document for each bucket contains an _id field, whose value specifies the inclusive lower bound and the exclusive upper bound for the bucket, and a count field that contains the number of documents in the bucket. The count field is included by default when the output is not specified.

https://docs.mongodb.com/manual/reference/operator/aggregation/bucketAuto/

Inheritance

Constructors

BucketAuto({@required AggregationExpr groupBy, @required int buckets, Map<String, Accumulator> output, Granularity granularity})
Creates $bucketAuto aggregation stage [...]

Properties

hashCode int
The hash code for this object. [...]
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

Methods

build() Map<String, dynamic>
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
toString() String
Returns a string representation of this object.
inherited

Operators

operator ==(Object other) bool
The equality operator. [...]
inherited