Merge pull request #39 from Iknow6aint/main

Modify getCampaignsByCategory to Use Cursor-Based Pagination isssue #33

src/resolvers/campaign.resolver.ts

@@ -9,6 +9,7 @@ import { Resolver, Query, Args, Mutation, Int } from '@nestjs/graphql';
 import { PrismaService } from 'src/prisma/prisma.service';
 import { Campaign } from './models/campaign.model';
 import { CampaignCreateInput } from './dtos/createCampaign.dto';
+import { PaginatedCampaigns, PaginationInput } from './dtos/pagination.models';
 import { CampaignConnection } from './dtos/getCampaigns.dto';
 
 @Resolver(() => Campaign)
@@ -93,16 +94,38 @@ export class CampaignResolver {
     return campaign;
   }
 
-  @Query(() => [Campaign])
-  async getCampaignByCategory(@Args('name') name: string): Promise<Campaign[]> {
+  @Query(() => PaginatedCampaigns)
+  async getCampaignsByCategory(
+    @Args('name') name: string,
+    @Args('pagination', { nullable: true }) pagination?: PaginationInput,
+  ): Promise<PaginatedCampaigns> {
     try {
-      return await this.prismaService.campaign.findMany({
+      const { cursor, limit, skip } = pagination || {};
+
+      // Fetch campaigns with pagination
+      const campaigns = await this.prismaService.campaign.findMany({
         where: { category: { name } },
         include: { campaign_images: true, category: true },
         orderBy: {
           created_at: 'desc',
         },
+        take: limit,
+        skip: skip,
+        cursor: cursor ? { campaign_id: cursor } : undefined,
+      });
+
+      const totalCount = await this.prismaService.campaign.count({
+        where: { category: { name } },
       });
+
+      // Determine if there is a next page
+      const hasNextPage = campaigns.length === limit;
+
+      return {
+        campaigns,
+        totalCount,
+        hasNextPage,
+      };
     } catch (error) {
       this.logger.error(
         'Failed to retrieve campaigns by category',

src/resolvers/dtos/pagination.models.ts

@@ -0,0 +1,26 @@
+import { Field, InputType, Int, ObjectType } from '@nestjs/graphql';
+import { Campaign } from '../models/campaign.model';
+
+@ObjectType()
+export class PaginatedCampaigns {
+  @Field(() => [Campaign])
+  campaigns: Campaign[];
+
+  @Field(() => Int)
+  totalCount: number;
+
+  @Field(() => Boolean)
+  hasNextPage: boolean;
+}
+
+@InputType()
+export class PaginationInput {
+  @Field(() => Int, { nullable: true })
+  cursor?: number;
+
+  @Field(() => Int)
+  limit: number;
+
+  @Field(() => Int, { nullable: true })
+  skip?: number;
+}