public function all($entity)
 {
     parent::all($entity);
     $this->filter = \DataFilter::source(\App\Movement::with('person', 'category', 'group'));
     $this->filter->build();
     $this->grid = \DataGrid::source($this->filter);
     $this->grid->add('fecha', 'Fecha', 'date');
     $this->grid->add('tipo', 'Tipo');
     $this->grid->add('monto', 'Monto');
     $this->grid->add('{{ $category->nombre }}', 'Categoría', 'category_id');
     $this->grid->add('{{ $person->nombre }}', 'Persona', 'person_id');
     $this->grid->add('{{ $group->nombre }}', 'Grupo', 'group_id');
     $this->addStylesToGrid();
     return $this->returnView();
 }