add service

src/modules/content/dtos/category.dto.ts

@@ -43,7 +43,7 @@ export class CreateCategoryDto {
     })
     @ValidateIf((value) => value.parent !== null && value.parent)
     @IsOptional({ always: true })
-    @Transform((value) => (value === 'null' ? null : value))
+    @Transform(({ value }) => (value === 'null' ? null : value))
     parent?: string;
 
     @Transform(({ value }) => toNumber(value))

src/modules/content/dtos/tag.dto.ts

@@ -11,6 +11,8 @@ import {
 } from 'class-validator';
 import { toNumber } from 'lodash';
 
+import { PaginateOptions } from '@/modules/database/types';
+
 export class QueryTagDto implements PaginateOptions {
     @Transform(({ value }) => toNumber(value))
     @Min(1, { message: 'The current page must be greater than 1.' })