@automapper/ 类

这是官方策略 @automapper tS/ES6级

安装

npm i @automapper/classes

或带有 yarn数字 :

yarn add @automapper/classes

peerDependencies

@automapper/classes 取决于 @automapper/core 财务报告和审定财务报表 reflect-metadata。 。 。 .

npm i @automapper/core reflect-metadata

或带有 yarn数字 :

yarn add @automapper/core reflect-metadata

使用量

@automapper/classes 提供 classes 作为 MappingStrategyInitializer。通过 classes() 改为 createMapper 创建 (单位:千美元) Mapper 用于 classes 战略.

import { classes, AutoMap } from '@automapper/classes';
import { createMapper, createMap, forMember, mapFrom } from '@automapper/core';

const mapper = createMapper({
  ...,
  strategyInitializer: classes()
});

class User {
    @AutoMap()
    firstName: string;
    @AutoMap()
    lastName: string;

    constructor(firstName: string, lastName: string) {
        this.firstName = firstName;
        this.lastName = lastName;
    }
}

class UserDto {
  @AutoMap()
  firstName: string;
  @AutoMap()
  lastName: string;
  @AutoMap()
  fullName: string;
}

createMap(
    mapper,
    User,
    UserDto,
    forMember(
        d => d.fullName,
        mapFrom(s => s.firstName + ' ' + s.lastName)
    )
);
mapper.map(new User('Auto', 'Mapper'), User, UserDto);
// UserDto { firstName: 'Auto', lastName: 'Mapper', fullName: 'Auto Mapper' }

自定义

classes() 接受两个可选参数:

• destinationConstructor:如何构建 Destination。这是默认 destinationConstructor 将用于 mapper.mapXXXX() 操作. DestinationConstructor 是具有下列签名的函数:

  export type DestinationConstructor<
      TSource extends Dictionary<TSource> = any,
      TDestination extends Dictionary<TDestination> = any
  > = (
      sourceObject: TSource, // the sourceObject used to map to the Destination
      destinationIdentifier: MetadataIdentifier<TDestination> // the Destination model
  ) => TDestination;
  
  // example
  mapper.map(user, User, UserDto);
  // sourceObject will be "user"
  // destinationIdentifier will be "UserDto"
  // This allows you to provide a default constructor that can be based on the Source object data
  

  • 有办法提供一次性习俗 destinationConstructor 任何给定的 Mapping 当你运行时 createMap。更多信息 构造

• applyMetadata:战略应如何将元数据应用于模型。 默认对大多数情况都有效,但是如果您想要定制,您可以. ApplyMetadata 是具有下列签名的函数:

  export type ApplyMetadataFn = <TModel extends Dictionary<TModel>>(
      model: MetadataIdentifier<TModel>
  ) => TModel;
  
  export type ApplyMetadata = (
      strategy: MappingStrategy<MetadataIdentifier>
  ) => ApplyMetadataFn;
  
  // for example
  const customApplyMetadata: ApplyMetadata = (strategy: MappingStrategy) => {
      // strategy contains the Mapper which stores all the models' metadata
      return (model) => {
          // based on this model, you can extract the metadata and do as you like
  
          return anObjectThatHasTheMetadataApplied; // { foo: undefined, bar: undefined }
      };
  };
  

更多信息,请访问 类文档