From a4209172b9b701436b225e5515e2d9a4772a4229 Mon Sep 17 00:00:00 2001
From: Muhammed Efe Cetin <efectn@protonmail.com>
Date: Thu, 13 Feb 2025 17:33:40 +0300
Subject: [PATCH] bind: fix linter

---
 binder/form_test.go |  4 ++--
 binder/mapping.go   | 20 +++++++++++++++++---
 docs/api/bind.md    |  1 -
 3 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/binder/form_test.go b/binder/form_test.go
index 98526b5307..d961f87346 100644
--- a/binder/form_test.go
+++ b/binder/form_test.go
@@ -99,12 +99,12 @@ func Test_FormBinder_BindMultipart(t *testing.T) {
 	}
 
 	type User struct {
+		Avatar  *multipart.FileHeader   `form:"avatar"`
 		Name    string                  `form:"name"`
 		Names   []string                `form:"names"`
 		Posts   []Post                  `form:"posts"`
-		Age     int                     `form:"age"`
-		Avatar  *multipart.FileHeader   `form:"avatar"`
 		Avatars []*multipart.FileHeader `form:"avatars"`
+		Age     int                     `form:"age"`
 	}
 	var user User
 
diff --git a/binder/mapping.go b/binder/mapping.go
index 061929f4f0..bc95d02822 100644
--- a/binder/mapping.go
+++ b/binder/mapping.go
@@ -262,14 +262,28 @@ func formatBindData[T, K any](out any, data map[string][]T, key string, value K,
 
 	switch v := any(value).(type) {
 	case string:
-		assignBindData(out, any(data).(map[string][]string), key, v, enableSplitting)
+		dataMap, ok := any(data).(map[string][]string)
+		if !ok {
+			return fmt.Errorf("unsupported value type: %T", value)
+		}
+
+		assignBindData(out, dataMap, key, v, enableSplitting)
 	case []string:
+		dataMap, ok := any(data).(map[string][]string)
+		if !ok {
+			return fmt.Errorf("unsupported value type: %T", value)
+		}
+
 		for _, val := range v {
-			assignBindData(out, any(data).(map[string][]string), key, val, enableSplitting)
+			assignBindData(out, dataMap, key, val, enableSplitting)
 		}
 	case []*multipart.FileHeader:
 		for _, val := range v {
-			data[key] = append(data[key], any(val).(T))
+			valT, ok := any(val).(T)
+			if !ok {
+				return fmt.Errorf("unsupported value type: %T", value)
+			}
+			data[key] = append(data[key], valT)
 		}
 	default:
 		return fmt.Errorf("unsupported value type: %T", value)
diff --git a/docs/api/bind.md b/docs/api/bind.md
index 973db0f295..eaad63050c 100644
--- a/docs/api/bind.md
+++ b/docs/api/bind.md
@@ -152,7 +152,6 @@ Run tests with the following `curl` command:
 curl -X POST -H "Content-Type: multipart/form-data" -F "name=john" -F "pass=doe" -F 'avatar=@filename' localhost:3000
 ```
 
-
 ### JSON
 
 Binds the request JSON body to a struct.