Refactor: move service logic out of api routes and into separate files

src/pages/api/beers/[id]/like/is-liked.ts

@@ -2,25 +2,20 @@ import getCurrentUser from '@/config/nextConnect/middleware/getCurrentUser';
 import { UserExtendedNextApiRequest } from '@/config/auth/types';
 import NextConnectOptions from '@/config/nextConnect/NextConnectOptions';
 import validateRequest from '@/config/nextConnect/middleware/validateRequest';
-import DBClient from '@/prisma/DBClient';
 import APIResponseValidationSchema from '@/validation/APIResponseValidationSchema';
 import { NextApiResponse } from 'next';
 import { createRouter } from 'next-connect';
 import { z } from 'zod';
+import findBeerPostLikeById from '@/services/BeerPostLike/findBeerPostLikeById';
 
 const checkIfLiked = async (
   req: UserExtendedNextApiRequest,
   res: NextApiResponse<z.infer<typeof APIResponseValidationSchema>>,
 ) => {
   const user = req.user!;
-  const id = req.query.id as string;
+  const beerPostId = req.query.id as string;
 
-  const alreadyLiked = await DBClient.instance.beerPostLike.findFirst({
-    where: {
-      beerPostId: id,
-      likedById: user.id,
-    },
-  });
+  const alreadyLiked = await findBeerPostLikeById({ beerPostId, likedById: user.id });
 
   res.status(200).json({
     success: true,
@@ -37,11 +32,7 @@ const router = createRouter<
 
 router.get(
   getCurrentUser,
-  validateRequest({
-    querySchema: z.object({
-      id: z.string().uuid(),
-    }),
-  }),
+  validateRequest({ querySchema: z.object({ id: z.string().uuid() }) }),
   checkIfLiked,
 );