QueryConstraint class

A QueryConstraint is used to narrow the set of documents returned by a Database query. QueryConstraints are created by invoking endAt(), endBefore(), startAt(), startAfter(), limitToFirst(), limitToLast(), orderByChild(), orderByChild(), orderByKey() , orderByPriority() , orderByValue() or equalTo() and can then be passed to query() to create a new query instance that also contains this QueryConstraint.

Signature:

export declare abstract class QueryConstraint 

Properties

QueryConstraint.type

The type of this query constraints

Signature:

abstract readonly type: QueryConstraintType;