title: Fail to try insert data in a one-to-many relationship with additional fields
body: <p>I'm trying to create a record from the parent relationship.</p>
  
  <p>My models </p>
  
  
  
  <pre class="lang-php prettyprint-override"><code>use Illuminate\Database\Eloquent\Model;
  
  class Cheque extends Model
  {
      protected $fillable = [
          "numero",
          "banco",
          "factura_id",
      ];
  
      public function factura()
      {
          return $this-&gt;belongsTo('App\Factura');
      }
  }
  
  class Factura extends Model
  {
      protected $fillable = [
          'cliente_id',
          'cotizacion_id',
          'sub_total',
          'porcentaje_descuento',
          'descuento_total',
          'total',
          'iva',
      ];
  
   public function cheque()
      {
          return $this-&gt;hasMany('App\Cheque');
      }
  </code></pre>
  
  <p>This is my code in FacturaController</p>
  
  <pre class="lang-php prettyprint-override"><code>$factura = Factura::create($request-&gt;all());
  
  $factura-&gt;cheque()-&gt;create($request-&gt;cheque);
  </code></pre>
  
  <p>The request:</p>
  
  <pre class="lang-php prettyprint-override"><code>{
      "cliente_id" : "3",
      "nombre" : "gustavo",
      "sub_total" : 20000.50,
      "porcentaje_descuento" : 20,
      "descuento_total" : 50,
      "total" : 100,
      "iva" : 12,
      "cheque" : {
                      "1" : {
                              "numero" : "25525886",
                              "banco" : "banesco"
                            }
                  }     
  }
  </code></pre>
  
  <p>The 'cheque' is created but the fields 'numero' and 'banco' are left blank.</p>
  
  <p>What am I doing wrong? </p>
  
  <p>Thanks in advance</p>