Handling Error on Insert PlayFramework 2.0 Scala - scala

Question

I'm having problem inserting (or updating) new data to database using anorm in Play Framework 2.0. My model is a blog post defined in the following code:
case class Post(title: String,
content: String,
created: String,
lastUpdate: String,
writer: Long,
id: Long = 0)
Then I do this on the insert function:
def create(title: String, content: String, userId: Long) = {
DB.withConnection { implicit connection =>
SQL("INSERT INTO post (title, content, created, writer) VALUES ({title}, {content}, NOW(), {writer})")
.on(
'title -> title,
'content -> content,
'writer -> userId).executeUpdate()
}
And the form:
val postForm = Form(
tuple(
"title" -> nonEmptyText,
"content" -> nonEmptyText))
I did not have a userId field in the form because I don't trust the user's input on their own id. I get it from session. Anyway, that's why I can't directly put the validation code in postForm's declaration (because I think I can't access session both from the form and from model). And here's when it becomes ugly. If the post is invalid, anorm throws an Exception so I need to pass the error to user AFTER the fold function like:
postForm.bindFromRequest.fold(
formWithErrors => BadRequest(views.html.post.newPost(formWithErrors)),
newPost => {
try {
val userId = request.session.get("id").getOrElse("0")
models.Post.create(newPost._1, newPost._2, userId.toLong)
} catch {
case e => BadRequest(views.html.post.newPost(postForm.fill(newPost)))
}
Redirect(routes.Application.index)
})
First, the try-catch is ugly. Second, the BadRequest call don't work. What am I doing wrong? What is the best way to handle errors in insert / update? I have the same problem with a login form, but it's not as bad as this because I can actually handle errors at login form declaration.
Thanks before.

Answer 1

Assuming the error is on an integrity constraint like 0 not existing in the database, what about something like this ?
postForm.bindFromRequest.fold(
formWithErrors => BadRequest(views.html.post.newPost(formWithErrors)),
newPost => {
request.session.get("id").map({ userId=>
models.Post.create(newPost._1, newPost._2, userId.toLong)
Redirect(routes.Application.index)
}).getOrElse{
BadRequest(views.html.post.newPost(postForm.fill(newPost)))
}
}
)
You don't give invalid information to anorm and don't get an error ...
ps : I don't have a scala compiler on hand to check the syntax right now, I might have missed a paren or mixed a paren with a curly :)