Class QuerierAbstract

Abstract Querier base class to implement Model Queriers. By extending this abstract base class and providing the extending class to the Linker, e.g., by Targeting it, the priority method of the resulting class will be called whenever the Model requests or persists data and, if this class claims the highest priority, its commit method will be called.

Decorator

Provide

Example

Simple Querier stub:

import { Provider, Target } from '@sgrud/core';
import { type Querier } from '@sgrud/data';
import { type Observable } from 'rxjs';

⁠@Target()
export class ExampleQuerier
  extends Provider<typeof Querier>('sgrud.data.Querier') {

  public override readonly types: Set<Querier.Type> = new Set<Querier.Type>([
    'query'
  ]);

  public override commit(
    operation: Querier.Operation,
    variables: Querier.Variables
  ): Observable<unknown> {
    throw new Error('Stub!');
  }

  public override priority(): number {
    return 0;
  }

}

See

Model

Hierarchy (view full)

Constructors

constructor

Properties

[provide] types

Methods

commit priority

Constructors

constructor

Properties

Static Readonly [provide]

[provide]: "sgrud.data.Querier" = 'sgrud.data.Querier'

Magic string by which this class is provided.

See

provide

Readonly Abstract types

types: Set<Querier.Type>

A set containing all types of queries this Querier can handle. May contain any of the 'mutation', 'query' and 'subscription' Types.

Methods

Abstract commit

Abstract priority

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