在 nest.js 中使用带有 nestjsx-automapper 的配置文件

Question

我正在使用Chau Tran 的nestjsx-automapper ( https://automapper.netlify.app/docs/usages/init/add-profile )（感谢这段很酷的代码）。我已经按照文档中所示和这里已经讨论过的方式实现了它： How use profiles from nartc/automapper into an nestjs application

但是我仍然无法从我的 Profile类中访问 AutoMapper。

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 {}

商户.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 {}

商家.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;
    }
}

商家.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);
    }
}

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

Answer 1

AutoMapperModule.withMapper()inAppModule是您唯一需要使用的时间AutoMapperModule。

withMapper()当您想在 a （或任何）中使用时AutoMapper，可以通过创建一个单例。@InjectMapper()MapperServiceInjectable

至于Profile，以下是正确的语法：

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

下面是写@nartc/automapper在那里的源代码addProfile()：

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

您可以在内部看到，@nartc/automapper将实例化 ( new profile())并将实例传递AutoMapper给 Profile 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 {}

在您的MerchantController：

@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.
    }
}

请让我知道这是否适合您。如果没有，请在nestjsx-automapperrepo 中创建一个问题并提供一个可重现的存储库，我会尽快查看。