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

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<?php
function computed_field_field_index_compute($entity_type_manager, $entity, $fields, $delta){
/* FROM D7
// dsm('-- computed --');
// dsm($entity_field, '$entity_field');
// dsm($entity_type, '$entity_type');
// dsm($entity, '$entity');
// dsm($field, '$field');
// dsm($instance, '$instance');
// dsm($items, '$items');
// dsm($entity_field[0]['value'], 'entity_field value');
if (!empty($entity_field[0]['value'])) { // the node is not new
return $entity_field[0]['value'];
}
else { // the node is new
// get all same entities in same family
$query = new EntityFieldQuery();
$query
->entityCondition('entity_type', $entity_type)
->entityCondition('bundle', $entity->type)
->fieldCondition('field_famille', 'value', $entity->field_famille['und'][0]['value']);
$result = $query->execute();
if(is_array($result[$entity_type])){
$entities = entity_load($entity_type, array_keys($result[$entity_type]));
// get identifiants fo these entities
$ids = array();
foreach ($entities as $id => $e) {
$identifiant = field_view_field($entity_type, $e, 'field_identifiant');
$ids[] = $identifiant[0]['#markup'] ? intval($identifiant[0]['#markup']) : 0;
}
sort($ids);
$value = strval(array_pop($ids) + 1);
}else{
$value = '1';
}
// parse the value to a string as 0023 or 4458 or 0001
$value_parts = str_split($value);
while (count($value_parts) < 4) {
array_unshift($value_parts, "0");
}
// record the result
$entity_field[0]['value'] = implode('', $value_parts);
}
*/
}
// function computed_field_field_identifiant_display($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, $delta) {
/* FROM D7
// dsm('-- computed --');
// dsm($entity_field, '$entity_field');
// dsm($entity_type, '$entity_type');
// dsm($entity, '$entity');
// dsm($field, '$field');
// dsm($instance, '$instance');
// dsm($items, '$items');
if (!empty($entity_field[0]['value'])) { // the node is not new
return $entity_field[0]['value'];
}
else { // the node is new
$entity_field[0]['value'] = $entity->field_famille['und'][0]['value'].'-'.$entity->field_identifiant['und'][0]['value'];
}
*/
}
// function computed_field_field_reference_materio_display($field, $entity_field_item, $entity_lang = "en", $langcode = "en") {
// return $entity_field_item['value'];
// }