/**
 * Implements hook_views_data().
 */
function app_core_views_data() {
  $data  = [];

  $data['views']['recommended_products'] = [
    'title' => t('Recommended products - Custom Filter' ),
    'filter' => [
      'title' => t('Recommended products - Custom Filter' ),
      'field' => 'id',
      'id' => 'recommended_products'
    ]
  ];

  return $data;
}