如何将 Mongoose 和 GridFS 集成到 NestJS 中？

Question

使用 Mongoose 和 GridFS 的正确方法是什么？

我正在尝试将 Mongodb Gridfs 添加到 NestJS 示例 14 (https://github.com/nestjs/nest/tree/master/sample/14-mongoose-base)

但是当我使用标签@InjectConnection 时：

  // files.service.ts
  private readonly fileModel: MongoGridFS;
  constructor(@InjectConnection() private readonly connection: Connection) {
    this.fileModel = new MongoGridFS(this.connection.db, 'fs');
  }
  async readStream(id: string): Promise<GridFSBucketReadStream> {
    return await this.fileModel.readFileStream(id);
  }

出现以下错误：

[Nest] 24282   - 04/20/2020, 4:10:23 PM   [ExceptionHandler] Nest can't resolve dependencies of the FilesService (?). Please make sure that the argument DatabaseConnection at index [0] is available in the FilesModule context.

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

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

Answer 1

由于 MongooseModule 不是 @Global()，您需要在需要数据库连接的任何地方导入该模块。在您的示例中，您只导入了 MulterModule，因此当您尝试执行 @InjectConnection() 时，Nest 找不到 Connection 来自的 MongooseModule，因此抛出一个错误。导入 MongooseModule 来解决这个问题。

如何将 Mongoose 和 GridFS 集成到 NestJS 中？

How to integrate Mongoose and GridFS to NestJS?

node.js

mongodb

nestjs

gridfs

multer-gridfs-storage