Save checkbox inside While Laravel

Question

I’d like to know how to save values checkbox within a while, the field comprar01 the checkbox who must return true or false.

I receive through the request():

$idproduto=$request->get('idproduto');
$qnt=$request->get('qnt'); 
$comprar01=$request->get('comprar01');

I do the while in the controller to save in the bank

$cont = 0;
while($cont < count($idproduto))
{
    $detalhe = new MapaCompraDet();
    $detalhe->idmapacompra = $dados->idmapacompra;
    $detalhe->idproduto = $idproduto[$cont];
    $detalhe->qnt = $qnt[$cont];     
    $detalhe->comprar01=$comprar01[$cont]; //aqui o problema
    $detalhe->save();
    $cont = $cont + 1;

Error:

I tried that

public function update(Request $request, $id){
  $dados = MapaCompra::findOrFail($id);        
  $idproduto=$request->get('idproduto');
  for ($i=0; $i < count($idproduto) ; $i++) {
      $comprar01 = (isset($request['comprar01']))?$request['comprar01']:'inativo';
      dd($comprar01);
  }

He brings me in dd only those marked, when not mark it does not bring. I searched here and saw that I have to put indices in the checkbox before entering, I am trying. Behold: https://cursos.alura.com.br/forum/topico-inserindo-valores-de-checkbox-no-banco-de-dados-44489

MY FORM HAS AN ARRAY

CODE

  <tbody id="tbodyCotacao">
                    @foreach($detalhes as $detalhe)
                      <tr>
                        <!-- ITENS COTAÇÃO 01 -->
                       <td>
                         <input style=" width: 60px" class="form-control" type="number" min="0" name="entrega01[]" value="{{$detalhe->entrega01}}">
                       </td>
                       <td>
                          <input style=" width: 70px" class="form-control" type="text" name="marca01[]" value="{{$detalhe->marca01}}">
                       </td>
                       <td>
                         <input id="pqnt" type="hidden" name="qnt[]" value="{{$detalhe->qnt}}">
                         <input id="vrunit01" style=" width: 65px;text-align:center" class="form-control" type="text" name="vrunit01[]" value="{{number_format($detalhe->vrunit01, 2, ',', '.') }}" onblur="multiplicar();" onblur="formatar();">
                       </td>
                       <td>
                         <input id="subtotal01" style="text-align:right;width: 75px" class="form-control subtotal01" type="hidden" name="subtotal01[]" readonly onblur="calcular();">
                         <input  style="text-align:right;width: 75px" type="text" class="form-control subtotal01T" id="subtotal01T" value="{{number_format($detalhe->qnt*$detalhe->vrunit01, 2, ',', '.') }}" readonly>
                       <td style="text-align:center">
                           <input @if($detalhe->comprar01=='c') {!! 'checked="checked" ' !!}@endif type="checkbox"  name="comprar01[]" value="c">
                       </td></tr>

Answer 1

Do so, apply a default value:

$comprar01 = $request->get('comprar01', 0);

OR

$comprar01 = $request->has('comprar01') ? 1 : 0;

In fields like 'active', which are Boolean in Migrations, and in the TINYINT database, before saving/updating I do the following.

$request->merge(['active' => $request->has('active')]);
$model->update($request->all());

At you;