fix: alert_cur_event return unmarshal json err (#2090)

Author: qinguoyi

models/alert_cur_event.go

@@ -305,8 +305,12 @@ func (e *AlertCurEvent) DB2FE() error {
 	e.CallbacksJSON = strings.Fields(e.Callbacks)
 	e.TagsJSON = strings.Split(e.Tags, ",,")
 	e.OriginalTagsJSON = strings.Split(e.OriginalTags, ",,")
-	json.Unmarshal([]byte(e.Annotations), &e.AnnotationsJSON)
-	json.Unmarshal([]byte(e.RuleConfig), &e.RuleConfigJson)
+	if err := json.Unmarshal([]byte(e.Annotations), &e.AnnotationsJSON); err != nil {
+		return err
+	}
+	if err := json.Unmarshal([]byte(e.RuleConfig), &e.RuleConfigJson); err != nil {
+		return err
+	}
 	return nil
 }
 
@@ -617,8 +621,8 @@ func AlertCurEventGetMap(ctx *ctx.Context, cluster string) (map[int64]map[string
 	return ret, nil
 }
 
-func (m *AlertCurEvent) UpdateFieldsMap(ctx *ctx.Context, fields map[string]interface{}) error {
-	return DB(ctx).Model(m).Updates(fields).Error
+func (e *AlertCurEvent) UpdateFieldsMap(ctx *ctx.Context, fields map[string]interface{}) error {
+	return DB(ctx).Model(e).Updates(fields).Error
 }
 
 func AlertCurEventUpgradeToV6(ctx *ctx.Context, dsm map[string]Datasource) error {