Laravel Form update multiple records - forms

Question

I have a list of users, and for each user of the list there is a select box where the selected value role value is shown.
I was thinking a way on how allow to send all the modifications for each user with the submit button to a method of the controller which should update the role. I have no idea.
This is the form, which works correctly:
{!!Form::open(['url' => ['admin/users/edit'], 'class' => 'form-horizontal', 'method' => 'POST']) !!}
#foreach($users as $user)
<div class="form-group">
<div class="list-user-element">{!! $user->name !!}</div>
<div class="list-user-email">{!! $user->email !!}</div>
<div>
{!! Form::select('role', $roles, $user->role->label, ['class' => 'form-control']); !!}
</div>
</div>
#endforeach
<div class="form-group">
<div class="col-sm-offset-2 col-sm-5">
{!! Form::submit('Update', array('class' => 'btn btn-warning')) !!}
</div>
</div>
{!! Form::close() !!}
I don't know how to prepare the controller, neither which kind of info is passed to the controller.
Route::post('admin/users/edit', 'AdminController#showRegisteredUsersRoles');
And here it gives error:
public function editRegisteredUsersRoles(Request $request)
{
dd($request);
}

Answer 1

You could do the form like this
{!! Form::select('users[' . $user->id . '].role', $roles, $user->role->label, ['class' => 'form-control']); !!}
And then in the controller
public function editRegisteredUsersRoles(Request $request)
{
foreach ($request->users as $user_id => $role) {
//...
}
}

Answer 2

I'm not 100% sure of what your problem is, are you saying that there aren't all of the users' roles in the Request when you dd($request) ?
I think the problem lies in the fact that you are looping through the users throwing down select boxes with the same name. Generally, when you send a POST request, you access the information by saying $_POST[<Form's name>], so maybe there is a problem with duplication here. Perhaps you should try something like:
{!! Form::select('role' . $user->id, $roles, $user->role->label, ['class' => 'form-control']); !!}
What I changed above is simply tacking on the user's id to the name 'role' in order to make each of those unique.