Hotfix/#211 최상단 카테고리 삭제 시 발생하는 이슈 해결

src/contents/contents.service.ts

@@ -470,10 +470,12 @@ export class CategoryService {
           parentCategory = await queryRunnerManager.findOne(Category, {
             where: { id: currentParentId },
           });
-          if (i == 1 && parentCategory?.parentId != null) {
+          if (i == 1 && parentCategory?.parentId !== null) {
             throw new ConflictException('Category depth should be 3');
           }
-          currentParentId = parentCategory?.parentId;
+          if (parentCategory?.parentId)
+            currentParentId = parentCategory?.parentId;
+          else break;
         }
       } else {
         /**
@@ -624,6 +626,8 @@ export class CategoryService {
 
       /**
        * 자식 카테고리가 있는 경우, 부모 카테고리와 연결
+       * 단, 삭제되는 카테고리가 1단 카테고리인 경우 부모 카테고리가 없으므로
+       * 자식 카테고리의 부모 카테고리를 null로 설정
        */
 
       // find parent category
@@ -638,10 +642,9 @@ export class CategoryService {
         where: { parentId: categoryId },
       });
 
-      // set children categories' parent to parent category
       await queryRunnerManager.save(
         childrenCategories.map((childrenCategory) => {
-          childrenCategory.parentId = parentCategory?.id;
+          childrenCategory.parentId = parentCategory?.id ?? null;
           return childrenCategory;
         }),
       );

src/contents/entities/category.entity.ts

@@ -26,8 +26,8 @@ export class Category extends CoreEntity {
   collections!: Collection[];
 
   @ApiProperty({ description: 'Category Parent ID' })
-  @Column({ nullable: true })
-  parentId?: number;
+  @Column({ type: 'int', nullable: true })
+  parentId?: number | null;
 
   @ManyToOne((type) => User, (user) => user.categories, {
     onDelete: 'CASCADE',

src/contents/repository/category.repository.ts

@@ -48,7 +48,9 @@ export class CategoryRepository extends Repository<Category> {
         if (i === 1 && parentCategory?.parentId !== null) {
           throw new ConflictException('Category depth should be 3');
         }
-        currentParentId = parentCategory?.parentId;
+        if (parentCategory?.parentId)
+          currentParentId = parentCategory?.parentId;
+        else break;
       }
     }
     // check if category exists in user's categories