Laravel detach Pivot tables - laravel

Question

I'm new with Laravel and I'm having problems while I try to detach some values from my pivot tables.
The pivot tables I'm woking with are:
excercise_workout (ejercicio_rutina) & excise_day (ejercicio_dia) (those tables have just two id's each one). The relations are ManyToMany. A workout have a lot of days and a day have a lot of excercises.
I've created these routes:
Route::resource('rutinas','RutinasController');
Route::delete('rutinas.destroyEjercicio/{id}','RutinasController#destroyEjercicio');
I have this button that is a form and call the delete:
{!! Form::open([
'method' => 'DELETE',
'action' => [ 'RutinasController#destroyEjercicio', $ejercicio->id ]
]) !!}
{!! Form::submit('Borrar Ejercicio', ['class' => 'btn btn-danger']) !!}
{!! Form::close() !!}
The destroyEjercicio is the part I don't know how to hadle with:
public function destroyEjercicio($id)
{
$ejercicio = Ejercicio::findOrFail($id);
dias()->$ejercicio->detach($id);
//EXAMPLE DELETE WITH QUERY
// DB::delete('delete from toy_user where toy_id = ? AND user_id = ? AND status = 0', array($toy->id,Auth::id()));
return redirect('rutinas');
}
I recieve this error when I try to submit the delete form:
Call to undefined function App\Http\Controllers\dias()
I've tried a lot of other methods but I don't know how to do it.
I need to know the ID of the day and the ID of the excercise I want to delete. And I don't know how the past it by the post request.
UPDATE -> THIS IS THE FORM I DO NOT HAVE INPUTS TO REQUEST...
#foreach ($rutina->dias as $dia)
<div class="col-md-6 col-md-offset-3">
<div class="panel panel-default">
<div class="panel-body">
Ejercicios para el <strong>{{ $dia->nombre }}</strong>
<hr>
#foreach ($dia->ejercicios as $ejercicio)
<ul>
<li>{{ $ejercicio->nombre }}</li>
</ul>
{!! Form::open([
'method' => 'DELETE',
'action' => [ 'RutinasController#destroyEjercicio', $ejercicio->id ]
]) !!}
{!! Form::submit('Borrar Ejercicio', ['class' => 'btn btn-danger']) !!}
{!! Form::close() !!}
#endforeach
</div>
</div>
</div>
#endforeach

Answer 1

You need something like this:
public function destroyEjercicio($ejercicioId, $diasId)
{
$ejercicio = Ejercicio::findOrFail($ejercicioId);
$ejercicio->dias()->detach($diasId);
https://laravel.com/docs/5.1/eloquent-relationships#inserting-many-to-many-relationships
Update
How to use Request object. If you're using forms, Reuqest object will contain all form fields. Just do something like this:
public function destroyEjercicio(Request $request)
{
$ejercicioId = $request->get('ejercicioIdField');
$diasId = $request->get('diasIdField');

Answer 2

I solved this the following way. First I create this new route:
Route::post('rutinas.destroyEjercicio/{ejercicioId}/{diaId}', [
'as' => 'destroy',
'uses' => 'RutinasController#destroyEjercicio'
]);
You must add this array at the form:
{!! Form::open([
'method' => 'POST',
*******'route' => ['destroy', $ejercicio->id, $dia->id]******
]) !!}
{!! Form::submit('Borrar Ejercicio', ['class' => 'btn btn-danger']) !!}
{!! Form::close() !!}
Then in your controller you pass the two id's that you need:
public function destroyEjercicio($ejercicioId, $diaId)
{
$ejercicio = Ejercicio::findOrFail($ejercicioId);
$ejercicio->dias()->detach($diaId);
return redirect('rutinas');
}