diff --git a/src/modules/content/dtos/post.dto.ts b/src/modules/content/dtos/post.dto.ts
index 5e27ea5..07ae320 100644
--- a/src/modules/content/dtos/post.dto.ts
+++ b/src/modules/content/dtos/post.dto.ts
@@ -26,18 +26,20 @@ export class QueryPostDto implements PaginateOptions {
     @IsOptional()
     isPublished?: boolean;
 
-    @IsEnum(PostOrder, { message: `` })
+    @IsEnum(PostOrder, {
+        message: `The sorting rule must be one of ${Object.values(PostOrder).join(',')}`,
+    })
     @IsOptional()
     orderBy: PostOrder;
 
     @Transform(({ value }) => toNumber(value))
-    @Min(1, { message: '' })
+    @Min(1, { message: 'The current page must be greater than 1.' })
     @IsNumber()
     @IsOptional()
     page = 1;
 
     @Transform(({ value }) => toNumber(value))
-    @Min(1, { message: '' })
+    @Min(1, { message: 'The number of data displayed per page must be greater than 1.' })
     @IsNumber()
     @IsOptional()
     limit = 10;
diff --git a/src/modules/content/services/post.service.ts b/src/modules/content/services/post.service.ts
index c326e3d..7c60974 100644
--- a/src/modules/content/services/post.service.ts
+++ b/src/modules/content/services/post.service.ts
@@ -65,7 +65,7 @@ export class PostService {
         const { orderBy, isPublished } = options;
         if (typeof isPublished === 'boolean') {
             isPublished
-                ? qb.where({ publishedAt: Not(IsNull) })
+                ? qb.where({ publishedAt: Not(IsNull()) })
                 : qb.where({ publishedAt: IsNull() });
         }
         this.queryOrderBy(qb, orderBy);