在 nest.js 中将配置文件与 nestjsx-automapper 一起使用

Question

我正在使用 Chau Tran 的 nestjsx-automapper (https://automapper.netlify.app/docs/usages/init/add-profile)（感谢那段很酷的代码）。我已经像文档中显示的那样实现了它，并且已经在这里讨论过： How use profiles from nartc/automapper into a nestjs application

但我仍然无法从我的个人资料中访问 AutoMapperclass。

这是我的设置：

app.module.ts:

import { Module } from '@nestjs/common';
import { AppService } from './app.service';
import { MerchantModule } from './merchant/merchant.module';
import { TypeOrmModule } from '@nestjs/typeorm';
import { AutomapperModule, AutoMapper } from 'nestjsx-automapper';

@Module({
  imports: [
    TypeOrmModule.forRoot({
      ...
    }),
    AutomapperModule.withMapper(),
    MerchantModule
  ],
  providers: [],
  controllers: [],
})
export class AppModule {}

merchant.module.ts:

import { Module } from '@nestjs/common';
import { MerchantController } from './merchant.controller';
import { MerchantService } from './merchant.service';
import { TypeOrmModule } from '@nestjs/typeorm';
import { Merchant } from './entities/merchant.entity';
import { MerchantProfile } from './profiles/merchant.profile';
import { AutoMapper, AutomapperModule } from 'nestjsx-automapper';

@Module({
  imports: [TypeOrmModule.forFeature([Merchant]), AutomapperModule, MerchantProfile],
  exports: [TypeOrmModule],
  controllers: [MerchantController],
  providers: [MerchantService]
})
export class MerchantModule {}

merchant.profile.ts:

import {
  ProfileBase,
  Profile,
  AutoMapper
} from 'nestjsx-automapper';
import { Merchant } from '../entities/merchant.entity';
import { MerchantDto } from '../dto/merchant.dto';

@Profile()
export class MerchantProfile extends ProfileBase {
  constructor(
    private readonly mapper: AutoMapper) {
    super();
    mapper.createMap(Merchant, MerchantDto);
  }

    configure(): void {      
      return null;
    }
}

merchant.controller.ts:

import { Controller, Get, Param, Post, Body, Put, Delete } from '@nestjs/common';
import { MerchantService } from './merchant.service';
import { Merchant } from './entities/merchant.entity';
import { MerchantDto } from './dto/merchant.dto';
import { DeleteResult } from 'typeorm';
import { AutoMapper, InjectMapper } from 'nestjsx-automapper';

@Controller('merchant')
export class MerchantController {

    constructor(
        private merchantService: MerchantService,
        @InjectMapper() private readonly mapper: AutoMapper) { }

    @Get()
    public async findAll(): Promise<MerchantDto[]> {
        return this.mapper.mapArray(await this.merchantService.find(),MerchantDto);
    }
}

当我运行使用此设置的应用程序时，出现以下异常： Nest 无法解析 AutomapperModule (?) 的依赖项。请确保索引 [0] 处的参数 AutomapperExplorer 在 AutomapperModule 上下文中可用。

Answer 1

我不太熟悉 AutoMappModule 的工作原理，但在你的 MerchantModule 中你似乎导入了 AutoMapperModule 而你应该导入 AutoMapperModule.withMapper()，类似于您在 AppModule 中的操作。

Answer 2

AutoMapperModule.withMapper() in AppModule 是您唯一需要使用 AutoMapperModule.

的时候

withMapper() 创建一个 AutoMapper 的单例，当您想在 Service（或任何Injectable)。

至于Profile，正确的语法如下：

@Profile()
export class MerchantProfile extends ProfileBase {
  constructor(mapper: AutoMapper) { // no private readonly.
    super();
    mapper.createMap(Merchant, MerchantDto);
  }
  // no configure() method
}

下面是@nartc/automapper源码中addProfile()的写法：

addProfile(profile: new (mapper: AutoMapper) => MappingProfile): AutoMapper {
    this._profileStorage.add(this, new profile(this));
    return this;
}

您可以看到，在内部，@nartc/automapper 将实例化 (new profile()) 并将 AutoMapper 实例传递给配置文件的构造函数，以便您可以在 Profile's constructor

对于你的这段代码 MerchantModule

import { Module } from '@nestjs/common';
import { MerchantController } from './merchant.controller';
import { MerchantService } from './merchant.service';
import { TypeOrmModule } from '@nestjs/typeorm';
import { Merchant } from './entities/merchant.entity';
// import { MerchantProfile } from './profiles/merchant.profile';
// this is all you need which is to import the profile so TypeScript can execute it. Don't need `MerchantProfile` at all
import './profiles/merchant.profile';
import { AutoMapper, AutomapperModule } from 'nestjsx-automapper';

@Module({
  imports: [TypeOrmModule.forFeature([Merchant])], // don't need to import AutoMapperModule again. MerchantProfile is not a Module so you can't import it
  exports: [TypeOrmModule],
  controllers: [MerchantController],
  providers: [MerchantService]
})
export class MerchantModule {}

在你的MerchantController中：

@Controller('merchant')
export class MerchantController {

    constructor(
        private merchantService: MerchantService,
        @InjectMapper() private readonly mapper: AutoMapper) { }

    @Get()
    public async findAll(): Promise<MerchantDto[]> {
        // make sure `this.merchantService.find()` returns an Array of 
        // Merchant instances. If not, please provide an extra param to map()
        // return this.mapper.mapArray(await this.merchantService.find(),MerchantDto);
        return this.mapper.mapArray(await this.merchantService.find(), MerchantDto, Merchant); // notice the 3rd parameter is the Source model.
    }
}

请告诉我这是否适合您。如果没有，请在 nestjsx-automapper repo 中创建一个问题并提供可重现的存储库，我会尽快查看。

在 nest.js 中将配置文件与 nestjsx-automapper 一起使用

Using Profiles with nestjsx-automapper in nest.js

mapping

automapper

node.js

nestjs