fix label == `` #4001

validation/validation.go

@@ -273,10 +273,13 @@ func (v *Validation) apply(chk Validator, obj interface{}) *Result {
 		Field = parts[0]
 		Name = parts[1]
 		Label = parts[2]
+		if len(Label) == 0 {
+			Label = Field
+		}
 	}
 
 	err := &Error{
-		Message:    Label + chk.DefaultMessage(),
+		Message:    Label + " " + chk.DefaultMessage(),
 		Key:        key,
 		Name:       Name,
 		Field:      Field,
@@ -293,19 +296,25 @@ func (v *Validation) apply(chk Validator, obj interface{}) *Result {
 	}
 }
 
+// key must like aa.bb.cc or aa.bb.
 // AddError adds independent error message for the provided key
 func (v *Validation) AddError(key, message string) {
 	Name := key
 	Field := ""
 
+	Label := ""
 	parts := strings.Split(key, ".")
 	if len(parts) == 3 {
 		Field = parts[0]
 		Name = parts[1]
+		Label = parts[2]
+		if len(Label) == 0 {
+			Label = Field
+		}
 	}
 
 	err := &Error{
-		Message: message,
+		Message: Label + " " + message,
 		Key:     key,
 		Name:    Name,
 		Field:   Field,
@@ -381,7 +390,6 @@ func (v *Validation) Valid(obj interface{}) (b bool, err error) {
 				}
 			}
 
-
 			chk := Required{""}.IsSatisfied(currentField)
 			if !hasRequired && v.RequiredFirst && !chk {
 				if _, ok := CanSkipFuncs[vf.Name]; ok {