Laravel - update one to one field - laravel

Question

I have an update post form, where I need to update the name of the post in posts table and the associated text within the text table. I can't seem to get it to work at all.
Model - Post.php
public function text()
{
return $this->hasOne('Text');
}
Model - Text.php
public function post()
{
return $this->belongsTo('Post');
}
Controller - PostController.php
public function updateQuestionForm($id)
{
$post = Post::find($id);
$input = Input::all();
$rules = array(
'text' => 'required',
);
$validation = Validator::make($input, $rules);
if ($validation->fails()) {
return Redirect::back()->withErrors($validation)->withInput();
} else {
$post->title = Input::get('title');
$post->save();
$text = $post->text();
$text->text = Input::get('text');
$post->text()->save($text);
$message = "Post updated";
return Redirect::to('question/'.$post->id.'/'.$post->slug.'/')->with('message', $message);
}
}