add posts, categories entity, module

src/categories/categories.service.ts

@@ -0,0 +1,70 @@
+import { Injectable } from '@nestjs/common';
+import { CreateCategoryDto } from './dto/create-category.dto';
+import { UpdateCategoryDto } from './dto/update-category.dto';
+import {InjectRepository} from "@nestjs/typeorm";
+import Post from "../posts/entities/post.entity";
+import {Repository} from "typeorm";
+import Category from "./entities/category.entity";
+import {CategoryNotFoundException} from "./exception/categoryNotFound.exception";
+
+@Injectable()
+export class CategoriesService {
+  
+  constructor(
+        @InjectRepository(Category) private repo: Repository<Category>,
+    ) {
+    }
+  
+  
+  
+  getAllCategories() {
+  return this.repo.find({ relations: ['posts'] });
+}
+ 
+async getCategoryById(id: number) {
+  const category = await this.repo.findOne({
+    where: { id },
+    relations: {
+      posts: true,
+    }
+  });
+  if (category) {
+    return category;
+  }
+  throw new CategoryNotFoundException(id);
+}
+ 
+async updateCategory(id: number, category: UpdateCategoryDto) {
+  await this.repo.update(id, category);
+  const updatedCategory = await this.repo.findOne({
+    where: { id },
+    relations: {
+      posts: true,
+    }
+  });
+  if (updatedCategory) {
+    return updatedCategory
+  }
+  throw new CategoryNotFoundException(id);
+}
+  
+  create(createCategoryDto: CreateCategoryDto) {
+    return 'This action adds a new category';
+  }
+
+  findAll() {
+    return `This action returns all categories`;
+  }
+
+  findOne(id: number) {
+    return `This action returns a #${id} category`;
+  }
+
+  update(id: number, updateCategoryDto: UpdateCategoryDto) {
+    return `This action updates a #${id} category`;
+  }
+
+  remove(id: number) {
+    return `This action removes a #${id} category`;
+  }
+}