Scala 2.12 with Play Framework - Form Binding implementing Nested Case Classes
I'm having a hard time understanding I'm trying to debug I've tried everything I can think of but I'm working on a project and hit a roadblock... I'm currently working on a Play Framework application using Scala 2.12, and I'm working with an scenario with form binding for nested case classes. I have a case class `User` that contains a nested case class `Profile`. Here's how they are defined: ```scala case class Profile(bio: String) case class User(name: String, age: Int, profile: Profile) ``` In my Play controller, I'm trying to bind the form data to these case classes as follows: ```scala def createUser = Action { implicit request: Request[AnyContent] => UserForm.bindFromRequest.fold( formWithErrors => { // Handle form errors BadRequest(views.html.userForm(formWithErrors)) }, userData => { // Process valid data Ok(s"User ${userData.name} created!") } ) } ``` The `UserForm` is defined using the `Form` API: ```scala val UserForm: Form[User] = Form( mapping( "name" -> nonEmptyText, "age" -> number, "profile" -> mapping( "bio" -> nonEmptyText )(Profile.apply)(Profile.unapply) )(User.apply)(User.unapply) ) ``` However, when I submit the form with the nested structure, I receive the following behavior: ``` Form binding behavior: Invalid value for 'profile.bio' (null or empty string) ``` I've ensured that the form field names match the case class properties, and I've checked that the HTML form produces the correct field names: ```html <form action="/createUser" method="post"> <input type="text" name="name" /> <input type="number" name="age" /> <input type="text" name="profile.bio" /> <button type="submit">Submit</button> </form> ``` Despite this, the binding fails for `profile.bio`, and I need to seem to isolate the question. I've tried debugging by printing out the form data before binding, and it appears correct. Has anyone faced a similar scenario with nested form bindings in Play Framework? What could be going wrong here? My development environment is Windows. Any ideas what could be causing this? I've been using Scala for about a year now. Thanks for your help in advance! I'm working on a REST API that needs to handle this. What's the correct way to implement this? The project is a desktop app built with Scala. This is part of a larger mobile app I'm building. Could someone point me to the right documentation?