环回4：@repository依赖项注入失败（TypeError：无法读取未定义的属性'findOne'）

我正在我的Loopback 4应用程序上设置Bearer Token身份验证，并且遵循以下常规实现：https : //github.com/strongloop/loopback-next/tree/master/packages/authentication。

在我的中src/providers/auth-strategy.provider.ts，我需要引用存储库对象才能查询我的数据源。我希望通过在@repository我正在使用的类的构造函数中使用装饰器进行依赖项注入来实现此目标。

但是，当我调用findOne()由@repository装饰器创建的存储库引用时，会产生以下错误：

TypeError: Cannot read property 'findOne' of undefined

这是我的版本auth-strategy.provider.ts：

import {Provider, inject, ValueOrPromise} from '@loopback/context';
import {Strategy} from 'passport';
import {
  AuthenticationBindings,
  AuthenticationMetadata,
} from '@loopback/authentication';
import {IVerifyOptions} from 'passport-http-bearer';
import {ApiClient} from '../models';
import {ApiClientRepository} from '../repositories';
import {Strategy as BearerStrategy} from 'passport-http-bearer';
import {repository} from '@loopback/repository';

export class BearerStrategyProvider implements Provider<Strategy | undefined> {
  constructor(
    @inject(AuthenticationBindings.METADATA)
    private metadata: AuthenticationMetadata,
    @repository(ApiClientRepository)
    private apiClientRepository: ApiClientRepository,
  ) {}

  value(): ValueOrPromise<Strategy | undefined> {
    // The function was not decorated, so we shouldn't attempt authentication
    if (!this.metadata) {
      return undefined;
    }

    const name = this.metadata.strategy;
    if (name === 'BearerStrategy') {
      return new BearerStrategy(this.verify);
    } else {
      return Promise.reject(`The strategy ${name} is not available.`);
    }
  }

  async verify(
    token: string,
    done: (error: any, user?: any, options?: IVerifyOptions | string) => void,
  ) {
    // call cb(null, false) when user not found
    // call cb(null, user) when user is authenticated
    let apiClient: ApiClient | null;
    try {
      apiClient = await this.apiClientRepository.findOne({
        where: {Token: token},
      });
      if (apiClient) {
        console.log("Found CLIENT!!! Here: " + apiClient.Email);
        done(null, {user: apiClient});
      } else {
        // if token not found in DB:
        done('Authentication Error.', false);
      }
    } catch (e) {
      console.log(e);
    }
  }
}