Variable becomes null from controller to View, with no apparent reason - laravel

Question

I'm stuck with the next topic. Help would be very appreciated.
Want to make a simple call to a view but, it becomes null during the process. Originally I was not making filters, just showing everything (notes:all()). Right now I'm trying to filter by date, ID, or user name, that's what I capture on my left controls before search button (bottom) is clicked. But now with filters applied (notas -sales-), it becomes null...
I post you my code, so you'll be kind and help me to identify why. I suspect about the routes (it's the fisrt time I define them manually).
The routes
Route::get('notas/notasGet/', 'NotasController#notasGet')->name('notas.notasGet');
Route::post('notas/notasPost/', 'NotasController#notasPost')->name('notas.notasPost');
Route::get('notas/create/', 'NotasController#create')->name('notas.create');
Route::get('notas/store/', 'NotasController#store')->name('notas.store');
Route::put('notas/update/{id}', 'NotasController#update')->name('notas.update');
Route::get('notas/{id}/edit', 'NotasController#edit')->name('notas.edit');
Route::delete('notas/destroy/{id}', 'NotasController#destroy')->name('notas.destroy');
Route::post('notas/cajaAbrir/', 'NotasController#cajaAbrir')->name('notas.cajaAbrir');
Route::post('notas/cajaCortar/', 'NotasController#cajaCortar')->name('notas.cajaCortar');
The ones with problem are notasGet, notasPost, which I call first from index
I call them from app.blade.php
<nav class="navbar navbar-expand-md navbar-light navbar-laravel">
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav ml-auto">
<li class="nav-item">
<a class="nav-link" href="/gymmgr/public/registroaccesos/destinationSearchGet/">Acceso</a>
</li>
<li class="nav-item">
<a class="nav-link" href="/gymmgr/public/notas/notasGet/">Venta</a>
</li>
At my controller, dd($notas); works fine
public function notasGet()
{
$fechaInicio = null;
$fechaFin = null;
$headData = array('pageTitle' => 'Admin Home - View all destinations');
$currentDate = Carbon::now()->format('Y-m-d');
//$notas = Nota::whereRaw('dtmHoraCargo IS NULL')->get()->first();
$notas = Nota::whereDate('dtmHoraCargo', '=', Carbon::today()->toDateString())->get();
//dd($notas);
$users = null;
$users = User::all();
$cajaAbierta = Caja::whereRaw('dtmCorte IS NULL')->get()->first();
//dd($cajaAbierta);
$data = array('notas'=>$notas,'fechaInicio'=>$fechaInicio,'fechaFin'=>$fechaFin, 'users'=>$users, 'caja'=>$cajaAbierta);
return view('notas.index', $data);
}
public function notasPost(Request $request)
{
$strSearch = $request->input('strSearch');
$fechaInicio = $request->input('fechaInicio');
$fechaFin = $request->input('fechaFin');
$strPatron = $request->input('strPatron');
$notas = null;
switch ($strSearch) {
case 0:
$notas = Nota::whereDate('dtmHoraCargo', '=', Carbon::today()->toDateString())->get();
break;
case 1:
$notas = Nota::whereRaw("dtmHoraCargo >= ? AND dtmHoraCargo <= ?", array($fechaInicio." 00:00:00", $fechaFin." 23:59:59"))->get();
break;
case 2:
$notas = Nota::find($strPatron);
break;
case 3:
$notas = Nota::whereDate('dtmHoraCargo', '=', Carbon::today()->toDateString())->get();
break;
}
$users = null;
$users = User::all();
$cajaAbierta = Caja::whereRaw('dtmCorte IS NULL')->get()->first();
// dd($cajaAbierta);
$data = array('notas'=>$notas,'fechaInicio'=>$fechaInicio,'fechaFin'=>$fechaFin, 'users'=>$users, 'caja'=>$cajaAbierta);
dd($notas);
/*It echoes the right nota but suddenly and going to the view it's null and the view calling crashes.
Nothing happens in between, so I don't know*/
return view('notas.index', $data);
//return view('registroaccesos.index', ['headData'=>$headData, 'usuarioSearch'=>$usuarioSearch]);
}
At index
<table class="table">
<thead class="thead-light">
<tr>
<th>Folio</th>
<th>Fecha y hora</th>
<th>Total</th>
<th>Aplica a</th>
<th>Saldo</th>
</tr>
</thead>
<tbody>
#foreach($notas as $nota)
<tr>
<td> {{ $nota->idNota }} ></td>
<td> {{ $nota->dtmHoraCargo }} </td>
<td> {{ $nota->dcmTotal }} </td>
<td> {{ empty($nota->idAplicaA)? '' : $nota->aplicaa->strPaterno . ' ' . $nota->aplicaa->strMaterno . ' ' . $nota->aplicaa->strNombre }} </td>
<td> {{ $nota->dcmSaldo }} </td>
</tr>
#endforeach
</tbody>
</table>
</main>
</div>
</div>
it triggers exception (notas is null, why????)
Trying to get property 'idNota' of non-object (View: C:\xampp\htdocs\gymmgr\resources\views\notas\index.blade.php)

Answer 1

In your switch in case 2 you get single object, in another cases you get collection. So, seems exception happen in this case 2.
case 2:
$notas = Nota::find($strPatron); // Will return object, but not the collection.
break;
You can try this:
case 2:
$notas = collect(Nota::find($strPatron));
break;