Merge branch 'dev' into test

@@ -136,6 +136,8 @@ func (repository *ArticleRepository) Find(ctx context.Context, conn transaction.
 			default:
 				tx = tx.Order("created_at desc")
 			}
+		} else {
+			tx = tx.Order("created_at desc")
 		}
 		if v, ok := queryOptions["ids"]; ok {
 			tx = tx.Where("id in (?)", v)

@@ -102,7 +102,7 @@ func (m *Article) SetSummary(sectionList []*ArticleSection) {
 	//设置内容概要
 
 	// 截取内容 50个字
-	stringIndex := 0 //字符串长度
+	length := 0 //字符串长度
 	content := ""
 	for i := range sectionList {
 		str := strings.TrimSpace(sectionList[i].Content)
@@ -111,11 +111,12 @@ func (m *Article) SetSummary(sectionList []*ArticleSection) {
 			break
 		}
 	}
-	stringIndex = len(content)
-	if len(content) > 50 {
-		stringIndex = 50
+	runeContent := []rune(content)
+	length = len(runeContent)
+	if length > 50 {
+		length = 50
 	}
-	m.Summary = content[0:stringIndex]
+	m.Summary = string(runeContent[0:length])
 }
 
 func (m *Article) WhoCanRead(userId int64) bool {