add support time.Duration on mapping (#1794)

binding/form_mapping.go

@@ -141,6 +141,10 @@ func setWithProperType(val string, value reflect.Value, field reflect.StructFiel
 	case reflect.Int32:
 		return setIntField(val, 32, value)
 	case reflect.Int64:
+		switch value.Interface().(type) {
+		case time.Duration:
+			return setTimeDuration(val, value, field)
+		}
 		return setIntField(val, 64, value)
 	case reflect.Uint:
 		return setUintField(val, 0, value)
@@ -263,6 +267,15 @@ func setSlice(vals []string, value reflect.Value, field reflect.StructField) err
 	return nil
 }
 
+func setTimeDuration(val string, value reflect.Value, field reflect.StructField) error {
+	d, err := time.ParseDuration(val)
+	if err != nil {
+		return err
+	}
+	value.Set(reflect.ValueOf(d))
+	return nil
+}
+
 func head(str, sep string) (head string, tail string) {
 	idx := strings.Index(str, sep)
 	if idx < 0 {