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copied!<p>You can do it all in the form definition.</p> <p>I have made some simple scala classes and objects from your example.</p> <p><code>models/Blog.scala</code></p> <pre class="lang-scala prettyprint-override"><code>package models /** * @author maba, 2013-04-10 */ case class User(id:Long) case class Blog(id:Long, author:User) case class Comment(id:Long, blog:Blog, comment:String) object Blog { def findById(id: Long): Option[Blog] = { Some(Blog(id, User(1L))) } } object Comment { def create(comment: Comment) { // Save to DB } } </code></pre> <p><code>controllers/Comments.scala</code></p> <pre class="lang-scala prettyprint-override"><code>package controllers import play.api.mvc.{Action, Controller} import play.api.data.Form import play.api.data.Forms._ import models.{Comment, Blog} /** * @author maba, 2013-04-10 */ object Comments extends Controller { val form = Form( mapping( "comment" -> nonEmptyText, "blog" -> mapping( "id" -> longNumber )( (blogId) => { Blog.findById(blogId) } )( (blog: Option[Blog]) => Option(blog.get.id) ).verifying("The blog does not exist.", blog => blog.isDefined) )( (comment, blog) => { // blog.get is always possible since it has already been validated Comment(1L, blog.get, comment) } )( (comment: Comment) => Option(comment.comment, Some(comment.blog)) ) ) def index = Action { implicit request => form.bindFromRequest.fold( formWithErrors => BadRequest, comment => { Comment.create(comment) Ok } ) } } </code></pre>

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