在Nestjs上的自定义拦截器中无法使用EEFLECTOR。无法导入模块

Question

我正在为我的Nestjs应用程序创建一个拦截器。我想将一些元数据添加到我的控制器方法中，并在拦截器中获得此值。

A进行了拦截器和自定义装饰器来添加元数据，但是当我尝试将反射器在拦截器构造函数中获取时，我会收到无法解决的错误。

我的拦截器：

@Injectable()
export class MyCustomInterceptor implements CacheInterceptor {
  private reflector: Reflector;

  constructor(reflector: Reflector) {
    this.reflector = reflector;
  }

  intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
    const myReflectionData = this.reflector.get<string[]>('mykey', context.getHandler());
  //...

我的自定义装饰器：

import { applyDecorators, SetMetadata } from '@nestjs/common';

export const MyCustomDecorator = (listOfData: Array<string>) => applyDecorators(
  SetMetadata('mykey', listOfData),
);

  @MyCustomDecorator(['data1', 'data2'])
  @UseInterceptors(MyCustomInterceptor)
  @Get()
  async listMyData(
    @Query('limit') limit = 10,
    @Query('skip') skip = '',
    @Query('orderBy') orderBy = 'id',
    @Query('sort') sort = 'DESC',
  ) {
    // .....

使用此代码，我会收到此错误：

[Nest] 10911  - 07/03/2022, 11:09:29 PM   ERROR [ExceptionHandler] Nest can't resolve dependencies of the MyCustomInterceptor (?). Please make sure that the argument Reflector at index [0] is available in the CommunitiesModule context.

Potential solutions:
- If Reflector is a provider, is it part of the current MyAppModule?
- If Reflector is exported from a separate @Module, is that module imported within MyAppModule?
  @Module({
    imports: [ /* the Module containing Reflector */ ]
  })

Error: Nest can't resolve dependencies of the MyCustomInterceptor (?). Please make sure that the argument Reflector at index [0] is available in the MyAppModule context.

Potential solutions:
- If Reflector is a provider, is it part of the current MyAppModule?
- If Reflector is exported from a separate @Module, is that module imported within MyAppModule?
  @Module({
    imports: [ /* the Module containing Reflector */ ]
  })

    at Injector.lookupComponentInParentModules (/.../node_modules/@nestjs/core/injector/injector.js:202:19)
    at Injector.resolveComponentInstance (/.../node_modules/@nestjs/core/injector/injector.js:157:33)
    at resolveParam (/.../node_modules/@nestjs/core/injector/injector.js:108:38)
    at async Promise.all (index 0)
    at Injector.resolveConstructorParams (/.../node_modules/@nestjs/core/injector/injector.js:123:27)
    at Injector.loadInstance (/.../node_modules/@nestjs/core/injector/injector.js:52:9)
    at Injector.loadProvider (/.../node_modules/@nestjs/core/injector/injector.js:74:9)
    at async Promise.all (index 8)
    at InstanceLoader.createInstancesOfProviders (/.../node_modules/@nestjs/core/injector/instance-loader.js:44:9)
    at /.../node_modules/@nestjs/core/injector/instance-loader.js:29:13

我试图将反射器添加到.module.ts中的导入和提供商中，但没有起作用：/

我该如何解决？

谢谢你

Answer 1

@Injectable()
export class MyCustomInterceptor implements CacheInterceptor {
  constructor(private reflector: Reflector) {}

  intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
    const myReflectionData = this.reflector.get<string[]>('mykey', context.getHandler());
  //...

或者：

@Injectable()
export class MyCustomInterceptor implements CacheInterceptor {
  @Inject() private reflector: Reflector;

  intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
    const myReflectionData = this.reflector.get<string[]>('mykey', context.getHandler());
  //...