refactor: changed the project structure

src/modules/attachment/attachment.service.ts

@@ -0,0 +1,39 @@
+import { Injectable, NotFoundException } from '@nestjs/common';
+import { CreateAttachmentDto } from './dto/create-attachment.dto';
+import { UpdateAttachmentDto } from './dto/update-attachment.dto';
+import { Attachment } from './entities/attachment.entity';
+import { AttachmentRepository } from './repositories/attachment.repository';
+import { AttachmentMessages } from 'src/common/enums/messages.enum';
+
+@Injectable()
+export class AttachmentService {
+  constructor(private readonly attachmentRepository: AttachmentRepository) {}
+
+  async create(createAttachmentDto: CreateAttachmentDto): Promise<Attachment> {
+    const attachment = this.attachmentRepository.create(createAttachmentDto);
+    await this.attachmentRepository.save(attachment);
+    return attachment;
+  }
+
+  async findAll(): Promise<Attachment[]> {
+    return await this.attachmentRepository.find();
+  }
+
+  async findOneOrFail(id: string): Promise<Attachment> {
+    const attachment = await this.attachmentRepository.findOne({where: {id}});
+    if(!attachment) throw new NotFoundException(AttachmentMessages.ATTACHMENT_NOT_FOUND);
+    return attachment;
+  }
+
+  async update(id: string, updateAttachmentDto: UpdateAttachmentDto): Promise<Attachment> {
+    const attachment = await this.findOneOrFail(id);
+    Object.assign(attachment, updateAttachmentDto);
+    return await this.attachmentRepository.save(attachment);
+  }
+
+  async remove(id: string): Promise<Attachment> {
+    const attachment = await this.findOneOrFail(id);
+    await this.attachmentRepository.remove(attachment);
+    return attachment;
+  }
+}