add validate:len=? support for utf-8

zhing · zhing · commit 0fa8dd2a3edd · 2015-07-12T13:22:36.000+08:00
diff --git a/baked_in.go b/baked_in.go
@@ -546,7 +546,7 @@ func hasLengthOf(top interface{}, current interface{}, field interface{}, param
 	case reflect.String:
 		p := asInt(param)
 
-		return int64(len(st.String())) == p
+		return int64(len([]rune(st.String()))) == p
 
 	case reflect.Slice, reflect.Map, reflect.Array:
 		p := asInt(param)
