feat: add scheduleDates field to ScheduleSchema for retrieving schedule dates

- Introduced a new `scheduleDates` field in the ScheduleSchema to allow users to fetch a list of schedule dates.
- Implemented argument handling for pagination and filtering, ensuring efficient data retrieval.
- Added error handling to prevent access during subscriptions and ensure user authentication before data access.
- Enhanced the overall functionality of the ScheduleSchema, improving user experience and data management.

src/Schedule/schedule.schema.ts

@@ -311,6 +311,29 @@ export class ScheduleSchema extends PothosSchema {
         },
       }),
 
+      scheduleDates: t.prismaField({
+        type: [this.scheduleDate()],
+        description: 'Retrieve a list of schedule dates.',
+        args: this.builder.generator.findManyArgs('ScheduleDate'),
+        resolve: async (query, _root, args, ctx, _info) => {
+          if (ctx.isSubscription) {
+            throw new Error('Cannot retrieve schedule dates in subscription')
+          }
+          if (!ctx.http?.me?.id) {
+            throw new Error('User not found')
+          }
+          return await this.prisma.scheduleDate.findMany({
+            ...query,
+            skip: args.skip ?? undefined,
+            take: args.take ?? undefined,
+            orderBy: args.orderBy ?? undefined,
+            where: {
+              AND: [{ participantIds: { has: ctx.http.me.id } }, ...(args.filter ? [args.filter] : [])],
+            },
+          })
+        },
+      }),
+
       centerPreviewSchedule: t.field({
         type: this.previewSchedule(),
         description: 'Preview a schedule for center mentor.',