I have a content type 'company' with a related tax-term: 'city'. With a view I can search for companies based on 'city' with autocomplete.

Is there a way I can relate adjacent cities into the same tax-term 'city'? If not, I would have to create a new tax-term into the content type 'company' and select for each company the adjacent cities. That is a lof of work.

Geo lookup is not an option, because we want te select which adjacent cities belongs to a specific city.

For example: Tax-term: city

City A
-- City B // adjacent city of 'city a'
-- City C // adjacent city of 'city a'
-- City D // adjacent city of 'city a'
City B
City C
City D

As you can see, City B, C and D exists in the tax-term but also are children of 'city A'. It should be an alias, because otherwise the children will have all a different ID, so that won't work.

Hope it is clear ...

  • 1
    Vocabularies aren't structured like that, you can't have terms that are aliases or shortcuts to other terms. What you're describing would usually be achieved using an entity reference field
    – Clive
    Apr 18 '18 at 9:22
  • First, I created an entity reference field. But I could not use this in the view ... then I asked my question here. Apr 18 '18 at 9:29
  • 1
    Regardless, you can't achieve what you've descried with taxonomy alone. All terms at any level of a vocabulary need to be real entities, not virtual
    – Clive
    Apr 18 '18 at 9:30
  • I understand, that were also my thoughts ... Apr 18 '18 at 11:37
  • If I use an entity reference field in the city-tax-term, and add those cities here. Could I collect those ID's with code and use these values as filter value in the view? Those ID's must be collected after hitting the search button... Apr 18 '18 at 11:45

I would like to share my own working solution. If you see any improvements, please correct me. That would be helpful. If not I hope this script can be helpful for someone else...

I've created my own module and used this function to alter the query:


use Drupal\views\ViewExecutable;
use Drupal\views\Plugin\views\query\QueryPluginBase;
use Drupal\taxonomy\Entity\Term;

function search_cities_views_query_alter(ViewExecutable $view, QueryPluginBase $query) {
    // machine_name of view
    if ($view->id() == 'zoek_een_bedrijf') {
        foreach ($query->where as &$condition_group) {
            foreach ($condition_group['conditions'] as &$condition) {
                // check which field must be changed
                if ($condition['field'] == 'node__field_stad.field_stad_target_id = :node__field_stad_field_stad_target_id') {
                    $value = $condition['value'];
                    // get ID from taxonomy term
                    $city_id = $value[':node__field_stad_field_stad_target_id'];
                    // load taxonomy term info
                    $term = Term::load($city_id);
                    // load reference field with taxonomy term ID's
                    $term_field = $term->get('field_aangrenzende_gemeenten')->getValue();
                    $cities = array();
                    // add ID from parent taxonmy term
                    array_push($cities, $city_id);
                    // add taxonomy terms from reference field (children)
                    foreach ($term_field as $key => $value) {
                        array_push($cities, $value['target_id']);
                    // update the condition before sending query to database
                    $condition = array(
                        'field' => 'node__field_stad.field_stad_target_id',
                        'value' => $cities,
                        'operator' => 'IN',

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