materio-d9/web/modules/custom/materio_id/materio_id.module

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<?php
function computed_field_field_index_compute($entity_type_manager, $entity, $fields, $delta){
// ksm($entity_type_manager);
// ksm($entity);
// ksm($fields);
// ksm($delta);
$famille = $entity->get('field_famille')->getValue()[0]['value'];
// $entity->isNew(); ??
// TODO: what if familly change ?
if (!empty($entity->field_index->value)) { // the node is not new
return $entity->field_index->value;
}
// the node is new
// get all same entities in same family
$query = \Drupal::entityQuery($entity->getEntityTypeId())
->condition('type', $entity->bundle())
->condition('field_famille', $famille)
->sort('field_index', 'DESC')
->range(0,1);
$nids = $query->execute();
if(is_array($nids)){
$last = entity_load($entity->getEntityTypeId(), array_pop($nids));
// get identifiants fo these entities
$index = $last->get('field_index')->getValue()[0]['value'] + 1;
}else{
$index = '1';
}
return $index;
}
// function computed_field_field_identifiant_display($field, $entity_field_item, $entity_lang = "en", $langcode = "en") {
// return $entity_field_item['value'];
// }
function computed_field_field_reference_compute($entity_type_manager, $entity, $fields, $delta) {
if (!empty($entity->field_reference->value)) { // the node is not new
return $entity->field_reference->value;
}
// the node is new
// parse the value to a string as 0023 or 4458 or 0001
$index_parts = str_split($entity->field_index->value);
while (count($index_parts) < 4) {
array_unshift($index_parts, "0");
}
return $entity->field_famille->value.'-'.implode('', $index_parts);
}
// function computed_field_field_reference_materio_display($field, $entity_field_item, $entity_lang = "en", $langcode = "en") {
// return $entity_field_item['value'];
// }
/**
* Implements hook_form_alter().
*/
function materio_id_form_node_materiau_edit_form_alter(&$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id) {
// dsm($form_id);
// ksm($form);
$node = $form_state->getFormObject()->getEntity();
// lock the family filed if already filled
if(isset($form['field_famille']) && $family = $node->field_famille->value){
// dsm($family);
$form['field_famille']['widget']['#disabled'] = true;
}
// adding reference to the form title
$ref = $node->field_reference->value;
// dsm($ref);
if($ref != ''){
$string = $form['#title']->getUntranslatedString() . ' (@ref)';
// dsm($string);
$args = $form['#title']->getArguments() + array('@ref'=>$ref);
// ksm($args);
$form['#title'] = t($string, $args);
}
}