ctx.ReadForm() return a error struct if give more params.

[wyanlord]

// 参数体
type RequestParams struct {
	A string `form:"a"`
	B string `form:"b"`
	C string `form:"c"`
}

// 请求日志记录
func NewAccessLogMdw() iris.Handler {
	return func(ctx context.Context) {
		var p = RequestParams{}
		ctx.ReadForm(&p)

		fmt.Println(p)

		ctx.Next()
	}
}

When post http://localhost:8080/users?c=5&d=1 with b=3.
The many results are:

{  }
{  }
{  5}
{ 3 5}
{ 3 5}
{ 3 }

If this can skip it without no exists param automatically, it will be better.

[kataras]

I don't quite understood, but you can check and skip an error coming from missing value for a struct field at ReadForm by IsErrPath

iris/_examples/http_request/read-form/main.go

Lines 29 to 33 in 6c054a9

	err := ctx.ReadForm(&visitor)
	if err != nil && !iris.IsErrPath(err) /* see: https://github.com/kataras/iris/issues/1157 */ {
	ctx.StatusCode(iris.StatusInternalServerError)
	ctx.WriteString(err.Error())
	}

[samchen945]

Hi, seems I have same issue here.

A very simple model:

type Order struct {
	OrderId string `form:"order_id"`
}

Post handler:

app.Handle("POST", "/", func(ctx context.Context) {
		fmt.Println("Raw form", ctx.FormValues())
		fmt.Println("Raw order_id", ctx.FormValue("order_id"))
		order := model.Order{}
		err := ctx.ReadForm(&order)
		if err != nil && !iris.IsErrPath(err) {
			fmt.Println(err)
			return
		}

		fmt.Println("In model: order_id(", order.OrderId, ")")
		fmt.Println("========")
	})

Postman values (As you might see I passed an extra email value):

Did several tests, and there were high chances of failures:

Any ideas or any mistake in my code?

[kataras]

Fixed by upstream and pushed to v11.2.1 @wyanlord and @samchen945 thanks a lot for the example.