英文:
Golang gin-gonic JSON binding
问题
我有以下结构体：
type foos struct {Foo string `json:"foo" binding:"required"`}
我有以下端点：
func sendFoo(c *gin.Context) {var json *foosif err := c.BindJSON(&json); err != nil {c.AbortWithStatus(400)return}// 对 json 做一些处理}
当我发送以下 JSON：
{"bar":"bar bar"}
err 总是为 nil。我已经写了 binding:"required"，但它不起作用。但是当我将端点更改为以下形式时：
func sendFoo(c *gin.Context) {var json foos // 移除指针if err := c.BindJSON(&json); err != nil {c.AbortWithStatus(400)return}// 对 json 做一些处理}
绑定起作用，err 不为 nil。为什么会这样？
英文:
I have the struct below
type foos struct { Foo string `json:"foo" binding:"required"`}
and I have the following endpoint
func sendFoo(c *gin.Context) {var json *foosif err := c.BindJSON(&json); err != nil {c.AbortWithStatus(400)return}// Do something about json}
when I post this JSON
{"bar":"bar bar"}
the err is always nil. I write binding required and it doesn't work. But when I change the endpoint like below,
func sendFoo(c *gin.Context) {var json foos //remove pointerif err := c.BindJSON(&json); err != nil {c.AbortWithStatus(400)return}// Do something about json}
binding works and the err is not nil. Why?
答案1
得分: 7
这段内容的翻译如下：
在 binding.go 的第25-32行有相关文档：
type StructValidator interface {// ValidateStruct 可以接收任何类型，并且不应该引发 panic，即使配置不正确。// 如果接收到的类型不是结构体，则应跳过任何验证，并返回 nil。// 如果接收到的类型是结构体或结构体指针，则应进行验证。// 如果结构体无效或验证本身失败，则应返回描述性错误。// 否则，必须返回 nil。ValidateStruct(interface{}) error}
在你的情况下，ValidateStruct 接收一个指向结构体指针的指针，并且不进行任何检查，正如文档中所述。
英文:
It is documented in binding.go, lines 25-32 :
type StructValidator interface {// ValidateStruct can receive any kind of type and it should never panic, even if the configuration is not right.// If the received type is not a struct, any validation should be skipped and nil must be returned.// If the received type is a struct or pointer to a struct, the validation should be performed.// If the struct is not valid or the validation itself fails, a descriptive error should be returned.// Otherwise nil must be returned.ValidateStruct(interface{}) error}
In your case, ValidateStruct receives a pointer to a pointer to a struct, and no checking takes place, as documented.
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论