refactor: enhance Quiz schema with role-based access control and service ID requirement

- Added role-based access control to restrict access to Quiz queries and mutations for users with the CENTER_MENTOR role.
- Updated error messages for unauthorized access to improve clarity.
- Introduced a required 'serviceId' argument in the quizzes query to ensure proper filtering and association with the center mentor.
- Refactored existing authentication checks to maintain consistent error handling across the Quiz schema.

src/Quiz/quiz.schema.ts

@@ -1,5 +1,5 @@
 import { Inject, Injectable } from '@nestjs/common'
-import { AnswerType } from '@prisma/client'
+import { AnswerType, Role } from '@prisma/client'
 import { QuestionType } from '@prisma/client'
 import { Pothos, PothosRef, PothosSchema, SchemaBuilderToken } from '@smatch-corp/nestjs-pothos'
 import { Builder } from '../Graphql/graphql.builder'
@@ -139,28 +139,41 @@ export class QuizSchema extends PothosSchema {
             throw new Error('Subscription is not allowed')
           }
           if (!ctx.http.me) {
-            throw new Error('User is not authenticated')
+            throw new Error('Unauthorized')
           }
           return await this.prisma.quiz.findUnique({ ...query, where: { id: args.where.id } })
         },
       }),
       quizzes: t.prismaField({
         type: [this.quiz()],
-        args: this.builder.generator.findManyArgs('Quiz'),
+        args: {
+          serviceId: t.arg({
+            type: 'String',
+            required: true,
+          }),
+        },
         resolve: async (query, _root, args, ctx, _info) => {
           if (ctx.isSubscription) {
             throw new Error('Subscription is not allowed')
           }
           if (!ctx.http.me) {
-            throw new Error('User is not authenticated')
+            throw new Error('Unauthorized')
+          }
+          if (ctx.http.me.role !== Role.CENTER_MENTOR) {
+            throw new Error('Unauthorized')
+          }
+          const centerMentor = await this.prisma.centerMentor.findUnique({
+            where: { mentorId: ctx.http.me.id },
+          })
+          if (!centerMentor) {
+            throw new Error('Center mentor not found')
           }
           return await this.prisma.quiz.findMany({
             ...query,
-            where: args.filter ?? undefined,
+            where: {
-            orderBy: args.orderBy ?? undefined,
+              serviceId: args.serviceId,
-            cursor: args.cursor ?? undefined,
+              centerMentorId: ctx.http.me.id,
-            take: args.take ?? undefined,
+            },
-            skip: args.skip ?? undefined,
           })
         },
       }),
@@ -185,7 +198,7 @@ export class QuizSchema extends PothosSchema {
             throw new Error('Subscription is not allowed')
           }
           if (!ctx.http.me) {
-            throw new Error('User is not authenticated')
+            throw new Error('Unauthorized')
           }
           if (!args.data) {
             throw new Error('Data is required')
@@ -223,7 +236,7 @@ export class QuizSchema extends PothosSchema {
             throw new Error('Subscription is not allowed')
           }
           if (!ctx.http.me) {
-            throw new Error('User is not authenticated')
+            throw new Error('Unauthorized')
           }
           return await this.prisma.quiz.update({
             ...query,
@@ -252,7 +265,7 @@ export class QuizSchema extends PothosSchema {
             throw new Error('Subscription is not allowed')
           }
           if (!ctx.http.me) {
-            throw new Error('User is not authenticated')
+            throw new Error('Unauthorized')
           }
           if (!args.data) {
             throw new Error('Data is required')