金戈朗中的验证编号

Question

我在验证gin中的数字时出错，对于字符串数据类型，没有错误，并且检测到了错误，但当我用字符串填充int类型的价格字段时，它得到了500的错误，我预计错误为400，解决方案是什么？

package web
type BookRequest struct{
Title string `json:"title" binding:"required"`
Description string `json:"description" binding:"required"`
Price int `json:"price" binding:"required,numeric,gte=0"`
Rating int `json:"rating" binding:"required,numeric"`
}

func (controller *BookControllerImpl) Create(ctx *gin.Context) {
var bookRequest web.BookRequest
err := ctx.ShouldBindJSON(&bookRequest)
if err != nil {
var error_request []string
for _, e := range err.(validator.ValidationErrors) {
errorMessage := fmt.Sprintf("Error field %s, Condition %s", e.Field(), e.ActualTag())
error_request = append(error_request, errorMessage)
}
ctx.JSON(http.StatusBadRequest, web.WebResponse{
Code:   http.StatusBadRequest,
Status: "BAD REQUEST",
Data:   error_request,
})
return
}
book, err := controller.BookService.Create(bookRequest)
if err != nil {
ctx.JSON(http.StatusBadRequest, web.WebResponse{
Code:   http.StatusBadRequest,
Status: "BAD REQUEST",
Data:   err,
})
}
ctx.JSON(http.StatusOK, web.WebResponse{
Code:   200,
Status: "Ok",
Data:   book,
})
}

Answer 1

1. when I fill in the price field of type int with a string

如果您的请求(payload Price(不是标准的，或者可能是string or number，则可以为结构使用json.Number类型。

type BookRequest struct{
Title string `json:"title" binding:"required"`
Description string `json:"description" binding:"required"`
Price json.Number `json:"price" binding:"required,numeric,gte=0"`
Rating int `json:"rating" binding:"required,numeric"`
}

这是json的一个简单示例。编号：https://go.dev/play/p/7fyCFAon2PC

2. 您必须检查错误是否为validator.ValidationErrors，如下所示：

...
err := ctx.ShouldBindJSON(&bookRequest)
if err != nil {
if vals, ok := err.(validator.ValidationErrors); ok {
// do for loop from vals
...
ctx.JSON(http.StatusBadRequest, web.WebResponse{
Code:   http.StatusBadRequest,
Status: "BAD REQUEST",
Data:   error_request,
})
return
}
ctx.JSON(http.StatusInternalServerError, web.WebResponse{
Code:   http.StatusInternalServerError,
Status: "Internal Server Error",
Data:   err,
})
return
}
...

======答案2======

你可以实现json.Unmarshaller来完成

这是一个例子：

func (br *BookRequest) UnmarshalJSON(b []byte) error {
// TODO: remove binding tag
type helperBookRequest struct {
Title       string `json:"title" binding:"required"`
Description string `json:"description" binding:"required"`
Price       any    `json:"price" binding:"required,numeric,gte=0"` // look at this type is any or interface{}
Rating      int    `json:"rating" binding:"required,numeric"`
}
var hbr helperBookRequest
err := json.Unmarshal(b, &hbr)
if err != nil {
return err
}
br.Title = hbr.Title
br.Description = hbr.Description
br.Rating = hbr.Rating
switch hbr.Price.(type) {
case float64:
br.Price = strconv.Itoa(int(hbr.Price.(float64)))
case string:
br.Price = hbr.Price.(string)
default:
return errors.New("invalid type")
}
return nil
}

操场上的一个简单例子：https://go.dev/play/p/tmnKW4peBgp