how to make a custom exposed filter for SOLR view with hook_views_data_alter

Hi dianacastillo, I know its super long time ago but by any chance do you remember how did you achieve this? I am facing similar problem any help will be highly appreciated.

I honestly thought this was the way to do it:

<?php

namespace Drupal\sbn\Plugin\views\filter;

use Drupal\search_api\Plugin\views\filter\SearchApiFilter;
use Drupal\views\Plugin\views\display\DisplayPluginBase;
use Drupal\views\ViewExecutable;

/**
 * Filters by Node Group.
 *
 * @ingroup views_filter_handlers
 *
 * @ViewsFilter("search_api_node_group")
 */
class SearchApiNodeGroupFilter extends SearchApiFilter {

  /**
   * {@inheritdoc}
   */
  public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
    parent::init($view, $display, $options);
    $this->valueTitle = t('Search API Node Groups');
    $this->definition['options callback'] = [$this, 'generateOptions'];
  }

  /**
   * Helper function that generates the options.
   *
   * @return array
   *   An array of group labels.
   */
  public function generateOptions() {
    // Assuming sbn_get_group_labels() returns an associative array of group labels
    return sbn_get_group_labels();
  }

	/**
	 * {@inheritdoc}
	 */
	public function query() {
		if (!empty($this->value) && is_array($this->value)) {
			// Retrieve the underlying Solr query.
			$solr_query = $this->query->getSolrQuery();

			// Construct the filter query.
			$filter_query = 'sm_sbn_add_nodegroup_str:(';
			$filter_queries = [];
			foreach ($this->value as $val) {
				// Escape special characters in Solr query syntax.
				$escaped_val = $solr_query->getHelper()->escapePhrase($val);
				$filter_queries[] = '"' . $escaped_val . '"';
			}
			$filter_query .= implode(' OR ', $filter_queries) . ')';

			// Add the filter query to the Solr query.
			$solr_query->addFilterQuery(['key' => 'sm_sbn_add_nodegroup_str', 'query' => $filter_query]);		}
	}
}

But Views won't even recognize it as a filter. I know sm_sbn_add_nodegroup_str is the correct solrid, so I don't know what else to try. Open to suggestions!

This was my solution to this problem, using hook_views_data_alter(): https://www.drupal.org/project/search_api/issues/3409919 💬 How to create a custom views filter for a seach api solr view? Fixed