Passing Object between Models - laravel

Question

I have a a couple of Models like so (some code removed for simplicity)
class Poll extends Model
{
public function poll()
{
return $this->hasOne('App\PollQuestion', 'pollId');
}
}
class PollQuestion extends Model
{
public function poll()
{
return $this->belongsTo('App\Poll');
}
}
I then have all my routes set up, for the PollQuestion they currently look like this
Route::model('polls.questions', 'PollQuestion');
Route::get('/admin/polls/{id}/addquestions', [
'as' => 'polls.questions.create',
'uses' => 'PollQuestionController#addQuestions'
]);
Route::post('/admin/polls/{id}/storequestions', [
'as' => 'polls.questions.store',
'uses' => 'PollQuestionController#storeQuestion'
]);
In my PollQuestionController, to see the questions view I have
public function addQuestions(Request $request)
{
$poll = Poll::where('id', '=', $request->id)->first();
return view('poll.admin.questions', compact('poll'));
}
Inside this view if I dump the poll e.g.
{{ dd($poll) }}
I can see what I expect to see. For the question form, I am doing
{!! Form::model(new App\PollQuestion, [
'route' => ['polls.questions.store', $poll]
]) !!}
So I presume that should pass my store function the Poll Object I previously dumped. However, in the store function, I do
public function storeQuestion(Request $request, Poll $poll) {
dd($poll);
}
And it shows Null. Why would this happen seeing that I am passing it the Poll Object I had previously dumped?
Thanks

Answer 1

You need use Route Model Binding correctly. According to Laravel Documentation
Route::model('poll-question', App\PollQuestion::class);
Route::get('/admin/polls/{poll-question}/addquestions', [
'as' => 'polls.questions.create',
'uses' => 'PollQuestionController#addQuestions'
]);
Route::post('/admin/polls/{poll-question}/storequestions', [
'as' => 'polls.questions.store',
'uses' => 'PollQuestionController#storeQuestion'
]);
Route::model define a variable in the route like a Model. This method searches the primary key passed in the route and retrieve the Model.