I want to add new taxonomy term to group of nodes that have specific terms already.

To retrive them I use this function

function getNodesByTaxonomyTermIds($termIds){     $termIds = (array) $termIds;     if(empty($termIds)){       return NULL;     }        $query = Drupal::database()->select('taxonomy_index', 'ti');     $query->fields('ti', array('nid'));     $query->condition('ti.tid', $termIds, 'IN');     $query->distinct(TRUE);     $result = $query->execute();        if($nodeIds = $result->fetchCol()){       return Node::loadMultiple($nodeIds);     }        return NULL;   } 

then in foreach loop I’m adding im adding them to new term based on their creation date but adding does not work.

Here is my field structure:

Firstly I tried all of those:

$node->set('field_news_categories', ['target_id' => $termID]) $node->set('field_news_categories', $termID) $node->set('field_news_categories', array($termID)) $node->field_news_categories->setValue(['target_id' => $termID]) $node->field_news_categories->setValue($termID) $node->field_news_categories->setValue(array($termID)) 

none worked so I thought maybe I should pass whole field with exact same structure, so I wanted to get field and just append the id and then pass it as argument in set method, but I wasn’t able to get field either. All I was receving were null values or empty arrays. I tried:

$node->field_news_categories->getValue() $node->get('field_news_categories')->getValue() $node->field_news_categories->value $node->get('field_news_categories')->value $node->field_news_categories $node->get('field_news_categories') $node->get('field_news_categories')->target_id $node->get('field_news_categories')->entity $node->get('field_news_categories')->referencedEntities() 

Project is in drupal 9