fix bug in create rest

src/modules/restaurants/providers/restaurants.service.ts

@@ -1,4 +1,4 @@
-import { Injectable, NotFoundException } from '@nestjs/common';
+import { BadRequestException, Injectable, NotFoundException } from '@nestjs/common';
 import { CreateRestaurantDto } from '../dto/create-restaurant.dto';
 import { UpdateRestaurantDto } from '../dto/update-restaurant.dto';
 import { Restaurant } from '../entities/restaurant.entity';
@@ -17,6 +17,14 @@ export class RestaurantsService {
   ) { }
 
   async create(dto: CreateRestaurantDto): Promise<Restaurant> {
+    const validateSlug = await this.em.findOne(Restaurant, { slug: dto.slug })
+    if (validateSlug) {
+      throw new BadRequestException("Duplicate slug: " + dto.slug)
+    }
+    const validateSubscriptionId = await this.em.findOne(Restaurant, { subscriptionId: dto.subscriptionId })
+    if (validateSubscriptionId) {
+      throw new BadRequestException("Duplicate subscriptionId: " + dto.subscriptionId)
+    }
     const restaurant = this.em.create(Restaurant, {
       name: dto.name,
       slug: dto.slug,