added merchants resource

src/merchants/merchants.service.ts

@@ -1,26 +1,35 @@
 import { Injectable } from '@nestjs/common';
 import { CreateMerchantDto } from './dto/create-merchant.dto';
 import { UpdateMerchantDto } from './dto/update-merchant.dto';
+import { MerchantDataService } from './merchant-data.service';
+import { Merchant } from './entities/merchant.entity';
 
 @Injectable()
 export class MerchantsService {
-  create(createMerchantDto: CreateMerchantDto) {
-    return 'This action adds a new merchant';
+  public constructor(private merchantDataService: MerchantDataService) { }
+
+  public async findAll(): Promise<Merchant[]> {
+    return await this.merchantDataService.getAllMerchants();
   }
 
-  findAll() {
-    return `This action returns all merchants`;
+  public async findById(id: string): Promise<Merchant> {
+    const merchant = await this.merchantDataService.getMerchantById(id);
+    if (!merchant) {
+      throw new Error('Merchant not found.');
+    }
+
+    return merchant;
   }
 
-  findOne(id: number) {
-    return `This action returns a #${id} merchant`;
+  public async create(newMerchant: CreateMerchantDto): Promise<Merchant> {
+    return await this.merchantDataService.createMerchant(newMerchant.name);
   }
 
-  update(id: number, updateMerchantDto: UpdateMerchantDto) {
-    return `This action updates a #${id} merchant`;
+  public async update(updateMerchant: UpdateMerchantDto): Promise<Merchant> {
+    return await this.merchantDataService.updateMerchant(updateMerchant);
   }
 
-  remove(id: number) {
-    return `This action removes a #${id} merchant`;
+  public async remove(id: string): Promise<void> {
+    await this.merchantDataService.deleteMerchant(id);
   }
 }