/**
  * Gets all ids that already exist in the post meta table from the provided records
  *
  * @param array $records Array of records
  * @param array $data Submitted data
  *
  * @return array
  */
 protected function get_existing_ids_from_import_data($import_data)
 {
     $unique_field = $this->get_unique_field();
     if (!$unique_field) {
         return array();
     }
     $parent_selected_ids = array();
     if (!empty($this->meta['ids_to_import']) && 'all' !== $this->meta['ids_to_import']) {
         if (is_array($this->meta['ids_to_import'])) {
             $selected_ids = $this->meta['ids_to_import'];
         } else {
             $selected_ids = json_decode($this->meta['ids_to_import']);
         }
     } else {
         $selected_ids = wp_list_pluck($import_data, $unique_field['source']);
     }
     if (empty($selected_ids)) {
         return array();
     }
     $event_object = new Tribe__Events__Aggregator__Event();
     $existing_ids = $event_object->get_existing_ids($this->meta['origin'], $selected_ids);
     return $existing_ids;
 }