solutions system

apps/backend/src/solutions/solutions.service.ts

@@ -0,0 +1,40 @@
+import { ConflictException, Injectable } from '@nestjs/common';
+import { CreateSolutionDto } from './dto/create-solution.dto';
+import { IssuesService } from 'src/issues/issues.service';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Solution } from './entities/solution.entity';
+import { Repository } from 'typeorm';
+
+@Injectable()
+export class SolutionsService {
+  constructor(
+    @InjectRepository(Solution)
+    private readonly repository: Repository<Solution>,
+    private readonly issues: IssuesService,
+  ) {}
+
+  async create(issueId: string, createSolutionDto: CreateSolutionDto) {
+    if ((await this.getForIssue(issueId)) !== null)
+      throw new ConflictException('This issue already has a solution');
+    const solution = this.repository.create({ ...createSolutionDto });
+    const issue = await this.issues.findOne(issueId);
+    solution.issue = Promise.resolve(issue);
+    return this.repository.save(solution);
+  }
+
+  async getForIssue(issueId: string): Promise<Solution | null> {
+    return this.repository.findOneBy({ issue: { id: issueId } });
+  }
+
+  async like(issueId: string, remove?: boolean) {
+    const ent = await this.getForIssue(issueId);
+    ent.likes = remove ? ent.likes - 1 : ent.likes + 1;
+    return this.repository.save(ent);
+  }
+
+  async dislike(issueId: string, remove?: boolean) {
+    const ent = await this.getForIssue(issueId);
+    ent.dislikes = remove ? ent.dislikes - 1 : ent.dislikes + 1;
+    return this.repository.save(ent);
+  }
+}