diff --git a/api/admin/challenge.go b/api/admin/challenge.go
index 7108198..13d2048 100644
--- a/api/admin/challenge.go
+++ b/api/admin/challenge.go
@@ -139,19 +139,20 @@ func EditChallenge(c *gin.Context) {
 		c.JSON(400, gin.H{"code": 400, "msg": "Request format wrong!"})
 		return
 	}
-	challenge := &Challenge{
-		ID:          cid,
+	attachmentString := strings.Join(request.Attachment, ",")
+	hintString := strings.Join(request.Hints, ",")
+	challenge := &CrDb{
 		Name:        request.Name,
 		Score:       request.Score,
 		Flag:        request.Flag,
 		Description: request.Description,
-		Attachment:  request.Attachment,
+		Attachment:  attachmentString,
 		Category:    request.Category,
 		Tags:        request.Tags,
-		Hints:       request.Hints,
+		Hints:       hintString,
 		Visible:     request.Visible,
 	}
-	err := DB.Table("challenge").Where("id = ?", cid).Updates(challenge).Error
+	err := DB.Debug().Table("challenge").Where("id = ?", cid).Updates(challenge).Error
 	if err != nil {
 		c.JSON(400, gin.H{"code": 400, "msg": "Update challenge failure!"})
 		return