feat(): diving into DI sub-trees

Author: egocentryk

src/app.module.ts

@@ -7,6 +7,7 @@ import { SchedulerModule } from './scheduler/scheduler.module'
 import { CronModule } from './cron/cron.module'
 import { FibonacciModule } from './fibonacci/fibonacci.module'
 import { HttpClientModule } from './http-client/http-client.module'
+import { TagsModule } from './tags/tags.module';
 
 @Module({
   imports: [
@@ -23,6 +24,7 @@ import { HttpClientModule } from './http-client/http-client.module'
       // isGlobal is an extra option, that can be used to modify the auto-generated module definition,
       // but they are not registered as part of the options object or provider
     }),
+    TagsModule,
     // Alternatively, we can use the `forRootAsync` method to register the module with dynamic options
     // HttpClientModule.forRootAsync({
     //   useFactory: () => ({ baseUrl: 'https://nestjs.com' }),

src/tags/dto/create-tag.dto.ts

@@ -0,0 +1 @@
+export class CreateTagDto {}

src/tags/dto/update-tag.dto.ts

@@ -0,0 +1,4 @@
+import { PartialType } from '@nestjs/mapped-types';
+import { CreateTagDto } from './create-tag.dto';
+
+export class UpdateTagDto extends PartialType(CreateTagDto) {}

src/tags/entities/tag.entity.ts

@@ -0,0 +1 @@
+export class Tag {}

src/tags/tags.controller.spec.ts

@@ -0,0 +1,20 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { TagsController } from './tags.controller';
+import { TagsService } from './tags.service';
+
+describe('TagsController', () => {
+  let controller: TagsController;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      controllers: [TagsController],
+      providers: [TagsService],
+    }).compile();
+
+    controller = module.get<TagsController>(TagsController);
+  });
+
+  it('should be defined', () => {
+    expect(controller).toBeDefined();
+  });
+});

src/tags/tags.controller.ts

@@ -0,0 +1,34 @@
+import { Controller, Get, Post, Body, Patch, Param, Delete } from '@nestjs/common';
+import { TagsService } from './tags.service';
+import { CreateTagDto } from './dto/create-tag.dto';
+import { UpdateTagDto } from './dto/update-tag.dto';
+
+@Controller('tags')
+export class TagsController {
+  constructor(private readonly tagsService: TagsService) {}
+
+  @Post()
+  create(@Body() createTagDto: CreateTagDto) {
+    return this.tagsService.create(createTagDto);
+  }
+
+  @Get()
+  findAll() {
+    return this.tagsService.findAll();
+  }
+
+  @Get(':id')
+  findOne(@Param('id') id: string) {
+    return this.tagsService.findOne(+id);
+  }
+
+  @Patch(':id')
+  update(@Param('id') id: string, @Body() updateTagDto: UpdateTagDto) {
+    return this.tagsService.update(+id, updateTagDto);
+  }
+
+  @Delete(':id')
+  remove(@Param('id') id: string) {
+    return this.tagsService.remove(+id);
+  }
+}

src/tags/tags.module.ts

@@ -0,0 +1,28 @@
+import { Module, OnApplicationBootstrap } from '@nestjs/common'
+import { TagsService } from './tags.service'
+import { TagsController } from './tags.controller'
+import { ContextIdFactory, ModuleRef } from '@nestjs/core'
+
+@Module({
+  controllers: [TagsController],
+  providers: [TagsService],
+})
+export class TagsModule implements OnApplicationBootstrap {
+  constructor(private readonly moduleRef: ModuleRef) {}
+
+  async onApplicationBootstrap() {
+    const contextId = ContextIdFactory.create()
+
+    this.moduleRef.registerRequestByContextId({ hello: 'world' }, contextId)
+
+    const tagsService = await this.moduleRef.resolve(TagsService, contextId)
+    console.log(tagsService)
+
+    // const tagsServices = await Promise.all([
+    //   this.moduleRef.resolve(TagsService, contextId),
+    //   this.moduleRef.resolve(TagsService, contextId),
+    // ])
+
+    // console.log(tagsServices[0] === tagsServices[1])
+  }
+}

src/tags/tags.service.spec.ts

@@ -0,0 +1,18 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { TagsService } from './tags.service';
+
+describe('TagsService', () => {
+  let service: TagsService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [TagsService],
+    }).compile();
+
+    service = module.get<TagsService>(TagsService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});

src/tags/tags.service.ts

@@ -0,0 +1,31 @@
+import { Inject, Injectable, Scope } from '@nestjs/common'
+import { CreateTagDto } from './dto/create-tag.dto'
+import { UpdateTagDto } from './dto/update-tag.dto'
+import { REQUEST } from '@nestjs/core'
+
+@Injectable({ scope: Scope.REQUEST })
+export class TagsService {
+  constructor(@Inject(REQUEST) request: unknown) {
+    console.log(request)
+  }
+
+  create(createTagDto: CreateTagDto) {
+    return 'This action adds a new tag'
+  }
+
+  findAll() {
+    return `This action returns all tags`
+  }
+
+  findOne(id: number) {
+    return `This action returns a #${id} tag`
+  }
+
+  update(id: number, updateTagDto: UpdateTagDto) {
+    return `This action updates a #${id} tag`
+  }
+
+  remove(id: number) {
+    return `This action removes a #${id} tag`
+  }
+}