From 39c42871aeda05050856ac0b2d72e6fd14364b97 Mon Sep 17 00:00:00 2001
From: daheige <zhuwei313@hotmail.com>
Date: Wed, 21 Apr 2021 23:05:59 +0800
Subject: [PATCH] setFormMap error of result

---
 binding/form_mapping.go | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/binding/form_mapping.go b/binding/form_mapping.go
index 2f4e45b4..c6c33b23 100644
--- a/binding/form_mapping.go
+++ b/binding/form_mapping.go
@@ -16,7 +16,15 @@ import (
 	"github.com/gin-gonic/gin/internal/json"
 )
 
-var errUnknownType = errors.New("unknown type")
+var (
+	errUnknownType = errors.New("unknown type")
+
+	// ErrConvertMapStringSlice covert to map[string][]string
+	ErrConvertMapStringSlice = errors.New("can not convert to map slices of strings")
+
+	// ErrConvertToMapString can not convert to map[string]string
+	ErrConvertToMapString = errors.New("can not convert to map of strings")
+)
 
 func mapUri(ptr interface{}, m map[string][]string) error {
 	return mapFormByTag(ptr, m, "uri")
@@ -371,7 +379,7 @@ func setFormMap(ptr interface{}, form map[string][]string) error {
 	if el.Kind() == reflect.Slice {
 		ptrMap, ok := ptr.(map[string][]string)
 		if !ok {
-			return errors.New("cannot convert to map slices of strings")
+			return ErrConvertMapStringSlice
 		}
 		for k, v := range form {
 			ptrMap[k] = v
@@ -382,7 +390,7 @@ func setFormMap(ptr interface{}, form map[string][]string) error {
 
 	ptrMap, ok := ptr.(map[string]string)
 	if !ok {
-		return errors.New("cannot convert to map of strings")
+		return ErrConvertToMapString
 	}
 	for k, v := range form {
 		ptrMap[k] = v[len(v)-1] // pick last