Question

我正在使用Loopback4框架。我尝试将存储库注入某些模型类（将documentRepository注入userModelClass）。我不确定是否可以做这样的事情。我之所以想这样做，是因为在存储库中，我有一个方法可以返回分配给用户的所有文档。稍后会有更多的模型必须使用相同的方法。

这是我尝试注入存储库（构造函数用户模型）的方式：

constructor(
    data?: Partial<User>,
    @repository(DokumentRepository) public dokumentRepository?: DokumentRepository
  )

启动应用程序时，我的控制台出现以下错误：

E:\workspace\compass\backend\node_modules\@loopback\repository\dist\decorators\repository.decorator.js:51
const stringOrModel = typeof modelOrRepo !== 'string' && !modelOrRepo.prototype.getId
                                                                      ^

TypeError: Cannot read property 'prototype' of undefined
    at Object.repository (E:\workspace\compass\backend\node_modules\@loopback\repository\dist\decorators\repository.decorator.js:51:75)
    at Object.<anonymous> (E:\workspace\compass\backend\dist\src\models\admin\user.model.js:266:29)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (E:\workspace\compass\backend\dist\src\repositories\admin\user.repository.js:19:22)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Module.require (module.js:596:17)
Waiting for the debugger to disconnect...

Process finished with exit code -1073741510 (0xC000013A: interrupted by Ctrl+C)

也许你们中的某人有一个想法如何将存储库注入模型，或者可以告诉我为什么这不可能...

Answer 1

我在使用完全相同的代码时遇到了一些麻烦，仅添加引号'DokumentRepository'就解决了该问题。

@repository(DokumentRepository) public dokumentRepository?: DokumentRepository

经过Loopback 4 v 1.21.4

的测试

这是我的代码。

export class OwnerRepository extends DefaultCrudRepository<Owner, typeof Owner.prototype.ownerId, OwnerRelations> {
  public readonly transactions: HasManyRepositoryFactory<Vehicle, typeof Vehicle.prototype.id>;
  public readonly accounts: HasManyRepositoryFactory<Account, typeof Account.prototype.id>;

  constructor(
    @inject('datasources.mongo') dataSource: MongoDataSource,
    @repository.getter('VehicleRepository') protected vehicleRepositoryGetter: Getter<VehicleRepository>,
    @repository.getter('AccountRepository') protected accountsRepositoryGetter: Getter<AccountRepository>,
    @repository('VehicleRepository') public vehicleRepository: VehicleRepository,
    @repository('AccountRepository') public accountRepository: AccountRepository,
  ) {
    super(Owner, dataSource);
    this.vehicles = this.createHasManyRepositoryFactoryFor('vehicles', vehicleRepositoryGetter);
    this.accounts = this.createHasManyRepositoryFactoryFor('accounts', accountsRepositoryGetter);
  }

将存储库注入模型类？

1 个答案: