格式化验证失败的错误信息, 默认tag=err, 支持重置默认tag

router/config.go

@@ -0,0 +1,25 @@
+// Package router ...
+//
+// Description : router ...
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 2025-02-07 17:41
+package router
+
+import "strings"
+
+var defaultValidateErrTag = "err"
+
+// SetValidateErrTag 设置验证失败时, 获取错误信息的tag字段
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 17:42 2025/2/7
+func SetValidateErrTag(tagName string) {
+	tagName = strings.TrimSpace(tagName)
+	if tagName == "" {
+		return
+	}
+	defaultValidateErrTag = tagName
+}

router/handler.go

@@ -31,6 +31,8 @@ func RequestHandler(uriCfg UriConfig) gin.HandlerFunc {
 		formData := reflect.New(uriCfg.FormDataType).Interface()
 		// 表单解析
 		if err = request.Form.Parse(ctx, formData); nil != err {
+			// 格式化验证错误的信息
+			err = GetValidateErr(formData, err)
 			e = exception.NewFromError(400, err)
 			response.SendWithException(ctx, e, nil)
 			return

router/register_test.go

@@ -21,7 +21,7 @@ func (t TestController) Logic(ctx *gin.Context, formData *TestForm) (any, error)
 
 type TestForm struct {
 	Meta `tag:"测试表单" path:"/a/b/c/d" desc:"测试接口" method:"get"`
-	Age  int    `json:"age" form:"age" binding:"min=20"`
+	Age  int    `json:"age" form:"age" binding:"min=20" err_msg:"年龄不能小于20"`
 	Name string `json:"name" form:"name"`
 	Test *Test  `json:"test" form:"test"`
 	Num  *int64 `json:"num" form:"num"`
@@ -31,6 +31,7 @@ type Test struct {
 }
 
 func Test_parseController(t *testing.T) {
+	SetValidateErrTag("err_msg")
 	r := gin.Default()
 	Group(r, "test", nil, TestController{})
 	r.Run(":8080")

router/validator.go

@@ -0,0 +1,55 @@
+// Package router ...
+//
+// Description : router ...
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 2025-02-07 17:36
+package router
+
+import (
+	"errors"
+	"fmt"
+	"github.com/go-playground/validator/v10"
+	"reflect"
+	"strings"
+)
+
+// GetValidateErr 格式化错误信息
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 22:19 2025/1/15
+func GetValidateErr(obj any, rawErr error) error {
+	if nil == rawErr {
+		return nil
+	}
+	if nil == obj {
+		return rawErr
+	}
+	var (
+		ok             bool
+		validationErrs validator.ValidationErrors
+		errString      []string
+		field          reflect.StructField
+	)
+	if ok = errors.As(rawErr, &validationErrs); !ok {
+		return rawErr
+	}
+	objType := reflect.TypeOf(obj)
+	if objType.Kind() == reflect.Ptr {
+		objType = objType.Elem()
+	}
+	for _, validationErr := range validationErrs {
+		if field, ok = objType.FieldByName(validationErr.Field()); ok {
+			if e := field.Tag.Get(defaultValidateErrTag); e != "" {
+				errString = append(errString, fmt.Sprintf("%s: %s", field.Tag.Get("json"), e))
+				continue
+			} else {
+				errString = append(errString, fmt.Sprintf("%s: %v", field.Tag.Get("json"), validationErr.Value()))
+			}
+		}
+		errString = append(errString, validationErr.Error())
+	}
+	return errors.New(strings.Join(errString, "\n"))
+}