node.js - 带有 MongoDB 和 NestJsxAutomapper 的 NestJS 导致错误 'cannot read property plugin of undefined'

Question

我正在使用 NestJS 开发 API，并且因为我有 DTO，所以我正在使用 AutoMapper(由 @nartc 和/或 nestjsx 制作)，我尝试使用 Foo 尽可能地缩小我的示例。例如，因为我使用了多个文件。
这是我的模块:

// foo.module.ts
import { Module } from "@nestjs/common";
import { MongooseModule } from "@nestjs/mongoose";

import { Foo, FooSchema } from "./foo.entity.ts";
import { FooController } from "./foo.controller.ts";
import { FooService } from "./foo.service.ts";
import { FooProfile } from "./foo.profile.ts";

@Module({
  imports: [
    MongooseModule.forFeature([
      {
        name: Foo.name,
        schema: FooSchema,
        collection: "foos",
      }
    ])
    // FooProfile <-- if I uncomment this, the program will give the error (shown at the bottom of this question)
  ],
  controllers: [FooController],
  providers: [FooProivder],
})
export class FooModule {}

这是我的实体:

// foo.entity.ts
import { Schema, SchemaFactory, Prop } from "@nestjs/mongoose";
import { Document } from "mongoose";

@Schema()
export class Foo extends Document { // if I remove the `extends Document` it works just fine
  @Prop({ required: true })
  name: string;
  @Prop()
  age: number
}

export const FooSchema = SchemaFactory.createForClass(Foo);

这是我的 DTO:

// foo.dto.ts
export class FooDTO {
  name: string;
}

这是我的 Controller :

// foo.controller.ts
import { Controller, Get } from "@nestjs/common";
import { InjectMapper, AutoMapper } from "nestjsx-automapper";

import { Foo } from "./foo.entity";
import { FooService } from "./foo.service";
import { FooDTO } from "./dto/foo.dto";

@Controller("foos")
export class FooController {
  constructor(
    private readonly fooService: FooService
    @InjectMapper() private readonly mapper: AutoMapper
  ) {}

  @Get()
  async findAll() {
    const foos = await this.fooService.findAll();
    const mappedFoos = this.mapper.mapArray(foos, Foo, FooDTO);
    // ^^ this throws an error of the profile being undefined (duh)
    return mappedFoos;
  }
}

这是我的个人资料:

// foo.profile.ts
import { Profile, ProfileBase, InjectMapper, AutoMapper } from "nestjsx-automapper";

import { Foo } from "./foo.entity";
import { FooDTO } from "./foo.dto";

@Profile()
export class FooProfile extends ProfileBase {
  constructor(@InjectMapper() private readonly mapper: AutoMapper) {
    // I've read somewhere that the `@InjectMapper() private readonly` part isn't needed,
    // but if I exclude that, it doesn't get the mapper instance. (mapper will be undefined)
    super();
    this.mapper.createMap(Foo, FooDTO);
  }
}

如果我取消注释我在模块中突出显示的行，它将导致以下错误..

[Nest] 11360   - 2020-08-18 15:53:06   [ExceptionHandler] Cannot read property 'plugin' of undefined +1ms
TypeError: Cannot read property 'plugin' of undefined
    at Foo.Document.$__setSchema ($MYPATH\node_modules\mongoose\lib\document.js:2883:10)
    at new Document ($MYPATH\node_modules\mongoose\lib\document.js:82:10)
    at new Foo($MYPATH\dist\foo\foo.entity.js:15:17)

我也提到了 this answer on stackoverflow ，但这对我也不起作用。我还将其与 documentation 结合使用, 但没有运气.. 我怎样才能让 AutoMapper 注册我的个人资料？
更新
如果我删除 extends Document，错误似乎源于 foo 实体。和 Schema() , Prop({ ... })从类里面它工作正常，似乎我必须注入(inject) Mongoose 之类的东西？

Answer 1

在您的模块中，只需导入配置文件的路径，如下所示:

import 'relative/path/to/foo.profile';

通过导入文件路径， TypeScript将文件包含在包中，然后是 @Profile()装饰器将被执行。当 @Profile()被执行， AutoMapperModule跟踪所有 Profiles然后轮到 NestJS 初始化 AutoMapperModule (使用 withMapper() 方法)， AutoMapperModule将自动将配置文件添加到 Mapper 实例。
话虽如此，在您的 FooProfile 中的构造函数，你会得到 AutoMapper此配置文件将添加到的实例

@Profile()
export class FooProfile extends ProfileBase {
   // this is the correct syntax. You would only need private/public access modifier
   // if you're not going to use this.mapper outside of the constructor
   // You DON'T need @InjectMapper() because that's Dependency Injection of NestJS. 
   // Profile isn't a part of NestJS's DI
   constructor(mapper: AutoMapper) {

   }
}

以上答案将解决您的问题 AutoMapper .至于你的 Mongoose 问题，我需要一个样本重现来确定。此外，请访问我们的 Discord 以了解此类问题。