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 *foos
if 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 pointer
if err := c.BindJSON(&json); err != nil {
c.AbortWithStatus(400)
return
}
// Do something about json
}
binding works and the err is not nil. Why?
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.
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