mapper-js
Auto mapper for you models like AutoMapper in .Net
Installation
yarn add @tomas_light/mapper-jsHow to use
MenuService.js
import { Mapper } from '@tomas_light/mapper-js';
export class MenuService {
update(menu) {
const entity = Mapper.map(
'Menu',
'MenuEntity',
menu
);
const menuEntity = this.db.update(entity);
}
}or with Typescript:
MenuService.ts
import { Mapper } from '@tomas_light/mapper-js';
import { MenuEntity } from './MenuEntity';
import { Menu } from './Menu';
export class MenuService {
update(menu: Menu) {
const entity = Mapper.map<MenuEntity>(
nameof<Menu>(),
nameof<MenuEntity>(),
menu
);
const menuEntity = this.db.update(entity);
}
}P.S. nameof in example from ts-nameof package (here https://www.npmjs.com/package/ts-nameof)
How to configure
You have an interface and its implementation
Menu.ts
export interface Menu {
id: number;
name?: string;
createDate: Date;
lastUpdate: Date;
author?: User;
dishes?: DishInMenu[];
}MenuEntity.ts
export interface MenuEntity {
id: number;
create_date: string;
last_update: string;
author_id?: number;
name?: string;
}Add mapping profile for your models
EntityMappingProfile.js
import { MapFunction, MappingProfile, MappingProfileBase } from '@tomas_light/mapper-js';
import { MenuEntity } from './MenuEntity';
import { Menu } from './Menu';
export class EntityMappingProfile extends MappingProfileBase {
get() {
return [
new MapFunction(
'Menu',
'MenuEntity',
EntityMappingProfile.mapMenuToMenuEntity
),
new MapFunction(
'MenuEntity',
'Menu',
EntityMappingProfile.mapMenuEntityToMenu
),
];
}
static mapMenuToMenuEntity(menu) {
return {
id: menu.id,
create_date: menu.createDate.toISOString(),
last_update: menu.lastUpdate.toISOString(),
author_id: menu.author?.id,
name: menu.name,
}
}
static mapMenuEntityToMenu(entity) {
return {
id: entity.id,
createDate: new Date(entity.create_date),
lastUpdate: new Date(entity.last_update),
name: entity.name,
}
}
}or with Typescript
EntityMappingProfile.ts
import { MapFunction, MappingProfile, MappingProfileBase } from '@tomas_light/mapper-js';
import { MenuEntity } from './MenuEntity';
import { Menu } from './Menu';
export class EntityMappingProfile extends MappingProfileBase implements MappingProfile {
get(): MapFunction[] {
return [
new MapFunction(
nameof<Menu>(),
nameof<MenuEntity>(),
EntityMappingProfile.mapMenuToMenuEntity
),
new MapFunction(
nameof<MenuEntity>(),
nameof<Menu>(),
EntityMappingProfile.mapMenuEntityToMenu
),
];
}
private static mapMenuToMenuEntity(menu: Menu): MenuEntity {
return {
id: menu.id,
create_date: menu.createDate.toISOString(),
last_update: menu.lastUpdate.toISOString(),
author_id: menu.author?.id,
name: menu.name,
}
}
private static mapMenuEntityToMenu(entity: MenuAttributes): Menu {
return {
id: entity.id,
createDate: new Date(entity.create_date),
lastUpdate: new Date(entity.last_update),
name: entity.name,
}
}
}After that, register your profiles in Mapper. Don't forget to call this function in your entrypoint file.
configureMapper.ts
import { Mapper } from '@tomas_light/mapper-js';
import { EntityMappingProfile } from './EntityMappingProfile';
export function configureMapper() {
Mapper.addProfiles([
new EntityMappingProfile(),
]);
}You can see more examples in mapper-js/src/Mapper.test.ts