[BUG] schema: invalid path "username"

[baiyuxiong]

Describe the bug
Browser shows:
schema: invalid path "username"schema: invalid path "username"

To Reproduce
Steps to reproduce the behavior:
codes as follow:

//main.go
user := mvc.New(app.Party("/my"))
	user.Register(
		userService,
		sessManager.Start,
	)
	user.Handle(new(controller.MyController))

//my_controller.go
type MyController struct {
	Ctx     iris.Context
	Service service.UserService
	Session *sessions.Session
}

func (c *MyController) GetLogin() mvc.Result {
	return mvc.View{
		Name: "my/login.html",
	}
}

type loginForm struct {
	Username string `form:"username"`
}

func (c *MyController) PostLogin(form loginForm) mvc.Result {
	fmt.Println(form.Username)
	return mvc.Response{
		Path: "/my/login",
	}
}

//my/login.html
<form action="/my/login" method="POST" enctype="multipart/form-data">
    <div class="container">
        <label><b>Username</b></label>
        <input type="text" placeholder="Enter Username" name="username" required>

        <button type="submit">Login</button>
    </div>
</form>

After click the login button, the page shows :
schema: invalid path "username"schema: invalid path "username"

Desktop (please complete the following information):

• OS: debian

iris.Version

• v12.2.11

[baiyuxiong]

I have found the reason why. It is due to my implementation of the NewUserService function.

userService in main.go is created by :
userService := service.NewUserService()

This NewUserService is wrong:

func NewUserService() *UserService {
	return &UserService{}
}

and if * was removed, it will work fine:

func NewUserService() UserService {
	return UserService{}
}

Superficially，the error msg "schema: invalid path" has nothing to do NewUserService. It makes me so confused.