@Self
@Self
This is the documentation for Angular 7.
You can switch to the latest version Angular 8.
You can switch to the latest version Angular 8.
A constructor parameter decorator that tells the DI framework to retrieve a dependency only from the local injector.
constructor(@Self() service: Service) {}
Example
In the following example, the dependency can be resolved by the local injector when instantiating the class itself, but not when instantiating a child.
class Dependency {}
@Injectable()
class NeedsDependency {
constructor(@Self() public dependency: Dependency) {}
}
let inj = ReflectiveInjector.resolveAndCreate([Dependency, NeedsDependency]);
const nd = inj.get(NeedsDependency);
expect(nd.dependency instanceof Dependency).toBe(true);
inj = ReflectiveInjector.resolveAndCreate([Dependency]);
const child = inj.resolveAndCreateChild([NeedsDependency]);
expect(() => child.get(NeedsDependency)).toThrowError();