2019年9月23日 · Injectable() in the service specifies that this service can be injected/used in other components. In short if service has injectable decorator, other components can use that service by creating reference of service class in the constructor.

In the @Injectable() decorator for the service itself. In the @NgModule() decorator for an NgModule. In the @Component() decorator for a component. The @Injectable() decorator has the providedIn metadata option, where you can specify the provider of the decorated service class with the root injector, or with the injector for a specific NgModule.

2016年5月19日 · The @Injectable decorator aims to actually set some metadata about which dependencies to inject into the constructor of the associated class. It's a class decorator that doesn't require parameters. It's a class decorator that doesn't require parameters.

2016年4月8日 · A component is injectable by default @Component() (or @Directive()) includes @Injectable(). Don't expect to get a specific instance of a component injected. This works for example with constructor(@Host() private parentComponent) where DI lookup is limited to parent injectors up to the injector of the host element.

2020年10月14日 · import { Injectable } from '@nestjs/common'; const userMock = [{ account: 'dung', password: '12345678' }]; @Injectable() export class UserService { getUser() { return userMock } } I not really understand @Injectable in NestJS. Some tutorial tell @Injectable tell the @Controller know it's an install and can use it as a Dependency Injection. But ...

2019年2月16日 · @Injectable mocks a single instance (e.g. a test method's parameter). Not every instance used inside the test context. Not every instance used inside the test context. @Mocked will mock all class methods and constructors on every instance created inside the test context.

2017年5月27日 · I don't know about all the lifecycle hooks, but as for destruction, ngOnDestroy actually get called on Injectable when it's provider is destroyed (for example an Injectable supplied by a component). From the docs : Lifecycle hook that …

2020年8月1日 · I know this is a little old but for anyone else looking at this: The unanswered point on the @InjectRepository() which from the @nestjs/typeorm package, this is a repository pattern which is available within the scope of the request with a db connection & will mean you are able to find an Office, find all Office, create an Office, update an Office or …

2016年5月3日 · Solution 1: The easiest solution is just to define an abstract class which implements the interface. Often, you need a abstract class anyway.

2020年9月11日 · Means this class can be used with an Injector. But Angular can't actually inject it anywhere until you configure an Angular dependency injector with a provider of that service. This can be done inside of @Injectable, @NgModule() or @Component() 2.) Declaring a service in the providers array of app.module is the same as @Injectable({providedIn ...