Modifying saving of the creation of new categories

Author: Aayush-Agnihotri

src/models/PostModel.ts

@@ -70,7 +70,9 @@ export class PostModel {
   })
   matched: RequestModel[];
 
-  @ManyToMany(() => CategoryModel, (category) => category.posts)
+  @ManyToMany(() => CategoryModel, (category) => category.posts, {
+    cascade: true,
+  })
   @JoinTable({
     name: "post_categories",
     joinColumn: { name: "posts", referencedColumnName: "id" },

src/repositories/CategoryRepository.ts

@@ -19,10 +19,13 @@ export class CategoryRepository extends AbstractRepository<CategoryModel> {
       .getMany();
 
     const existingNames = new Set(existing.map((c) => c.name));
+
+    const newNames = [
+      ...new Set(names.filter((name) => !existingNames.has(name))),
+    ];
 
-    const newCategories = names
-      .filter((name) => !existingNames.has(name))
-      .map((name) => this.repository.create({ name }));
+    // Create in-memory entities (not saving them)
+    const newCategories = newNames.map((name) => this.repository.create({ name }));
 
     if (newCategories.length > 0) {
       await this.repository.save(newCategories);