add the last module, departments module

src/departments/departments.controller.spec.ts

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

src/departments/departments.controller.ts

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+import { Controller, Get, Post, Body, Patch, Param, Delete } from '@nestjs/common';
+import { DepartmentsService } from './departments.service';
+import { CreateDepartmentDto } from './dto/create-department.dto';
+import { UpdateDepartmentDto } from './dto/update-department.dto';
+
+@Controller('departments')
+export class DepartmentsController {
+  constructor(private readonly departmentsService: DepartmentsService) {}
+
+  @Post()
+  create(@Body() createDepartmentDto: CreateDepartmentDto) {
+    return this.departmentsService.create(createDepartmentDto);
+  }
+
+  @Get()
+  findAll() {
+    return this.departmentsService.findAll();
+  }
+
+  @Get(':id')
+  findOne(@Param('id') id: string) {
+    return this.departmentsService.findOne(+id);
+  }
+
+  @Patch(':id')
+  update(@Param('id') id: string, @Body() updateDepartmentDto: UpdateDepartmentDto) {
+    return this.departmentsService.update(+id, updateDepartmentDto);
+  }
+
+  @Delete(':id')
+  remove(@Param('id') id: string) {
+    return this.departmentsService.remove(+id);
+  }
+}

src/departments/departments.module.ts

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+import { Module } from '@nestjs/common';
+import { DepartmentsService } from './departments.service';
+import { DepartmentsController } from './departments.controller';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { Department } from './entities/department.entity';
+
+@Module({
+  imports: [TypeOrmModule.forFeature([Department])],
+  controllers: [DepartmentsController],
+  providers: [DepartmentsService],
+})
+export class DepartmentsModule {}

src/departments/departments.service.spec.ts

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

src/departments/departments.service.ts

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+import { Injectable } from '@nestjs/common';
+import { CreateDepartmentDto } from './dto/create-department.dto';
+import { UpdateDepartmentDto } from './dto/update-department.dto';
+import { Repository } from 'typeorm';
+import { Department } from './entities/department.entity';
+import { InjectRepository } from '@nestjs/typeorm';
+
+@Injectable()
+export class DepartmentsService {
+  constructor(
+    @InjectRepository(Department)
+    private readonly departmentRepository: Repository<Department>,
+  ) {}
+
+  async create(createDepartmentDto: CreateDepartmentDto) {
+    const department = this.departmentRepository.create(createDepartmentDto);
+    return this.departmentRepository.save(department);
+  }
+
+  async findAll() {
+    return this.departmentRepository.find();
+  }
+
+  async findOne(id: number) {
+    return this.departmentRepository.findOne({ where: { id } });
+  }
+
+  async update(id: number, updateDepartmentDto: UpdateDepartmentDto) {
+    const department = this.departmentRepository.create(updateDepartmentDto);
+    await this.departmentRepository.update(id, department);
+    return this.findOne(id);
+  }
+
+  async remove(id: number) {
+    return this.departmentRepository.delete(id);
+  }
+}

src/departments/dto/create-department.dto.ts

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+import { IsNotEmpty, IsNumber, IsString } from 'class-validator';
+
+export interface IDepartment {
+  name: string;
+  employer_id: number;
+}
+
+export class CreateDepartmentDto implements IDepartment {
+  @IsString()
+  @IsNotEmpty()
+  name: string;
+
+  @IsNumber()
+  @IsNotEmpty()
+  employer_id: number;
+}

src/departments/dto/update-department.dto.ts

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+import { PartialType } from '@nestjs/mapped-types';
+import { CreateDepartmentDto } from './create-department.dto';
+
+export class UpdateDepartmentDto extends PartialType(CreateDepartmentDto) {}

src/departments/entities/department.entity.ts

@@ -0,0 +1,25 @@
+import {
+  Column,
+  CreateDateColumn,
+  Entity,
+  PrimaryGeneratedColumn,
+  UpdateDateColumn,
+} from 'typeorm';
+
+@Entity({ name: 'departments' })
+export class Department {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @Column()
+  name: string;
+
+  @Column()
+  employer_id: number;
+
+  @CreateDateColumn()
+  created_at: Date;
+
+  @UpdateDateColumn()
+  updated_at: Date;
+}