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docs: clarify that `forRoot` can be called in other modules (#42361) 

The faq on `forRoot` implies that you cannot and should not call `forRoot` for an import
outside the AppModule. This is technically incorrect. This commit clarifies
the statement and refers the reader to the hierarchical injectors guide.

fixes #29002

PR Close #42361
This commit is contained in:
Andrew Scott 2021-05-26 11:22:12 -07:00 committed by Andrew Kushnir
parent 15726594a9
commit bcfe4afda9
1 changed files with 6 additions and 0 deletions
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aio/content/guide/ngmodule-faq.md
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@ -180,6 +180,12 @@ Only call and import a `forRoot()` result in the root application module, `AppMo
Avoid importing it in any other module, particularly in a lazy-loaded module. For more Avoid importing it in any other module, particularly in a lazy-loaded module. For more
information on `forRoot()` see [the `forRoot()` pattern](guide/singleton-services#the-forroot-pattern) section of the [Singleton Services](guide/singleton-services) guide. information on `forRoot()` see [the `forRoot()` pattern](guide/singleton-services#the-forroot-pattern) section of the [Singleton Services](guide/singleton-services) guide.
<div class="alert is-helpful">
Note: the `forRoot()` import can be used in a module other than `AppModule`. Importantly,
`forRoot()` should only be called once, and the module that imports the `forRoot()` needs to be available to
the root `ModuleInjector`. For more information, refer to the guide on [Hierarchical injectors](guide/hierarchical-dependency-injection#moduleinjector).
</div>
For a service, instead of using `forRoot()`, specify `providedIn: 'root'` on the service's `@Injectable()` decorator, which For a service, instead of using `forRoot()`, specify `providedIn: 'root'` on the service's `@Injectable()` decorator, which
makes the service automatically available to the whole application and thus singleton by default. makes the service automatically available to the whole application and thus singleton by default.