ModelAggregateQuery<TValue extends AsyncAggregateValue> class

A query to output an aggregate of the documents in a collection.

コレクションのドキュメントの集計を出力するためのクエリ。

Annotations

• @immutable

Properties

defaultValue → Object?

Initial value if value could not be obtained.

final

hashCode → int

The hash code for this object.

no setter, override

key → String?

Field key to be queried.

final

onCreate → TValue Function(ModelAggregateQuery<AsyncAggregateValue> query, CollectionBase<DocumentBase> collection, VoidCallback onFinished)

Create an AsyncAggregateValue from the query.

final

onUpdate → Future<void> Function(ModelUpdateNotification update, AsyncAggregateValue value)

Defines the behavior of the collection when it receives an update notification.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

type → ModelAggregateQueryType

Query type.

final

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

override

Static Methods

average(String key) → ModelAggregateQuery<AsyncAggregateValue<double>>

Query to output the average value of the field key of the documents in the collection.

count() → ModelAggregateQuery<AsyncAggregateValue<int>>

A query to output the total number of documents in the collection.

sum(String key) → ModelAggregateQuery<AsyncAggregateValue<double>>

Query to output the total value of the fields in key of the documents in the collection.