{{Form::open([
  'action' => 'AdminDebtsController@store'
])}}
<div class="modal fade" id="register-debt-modal">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-body">
        {{Form::hidden('user_id', isset($user) ? $user->id : NULL )}}
        <div class="form-group">
          {{Form::label('amount', 'Monto')}}
          <div class="input-group">
            <span class="input-group-addon">$</span>
            {{Form::number('amount', NULL, ['class' => 'form-control'])}}
          </div>
        </div>

        <div class="form-group">
          {{Form::label('comments', 'Comentarios')}}
          {{Form::textarea('comments', NULL, ['class' => 'form-control', 'rows' => 3])}}
        </div>
      </div>

      <div class="modal-footer">
        <button type="button" data-dismiss="modal" class="btn btn-default">Cancelar</button>
        <button type="submit" class="btn btn-primary">Guardar</button>
      </div>
      
    </div>
  </div>
</div>

{{Form::close()}}