BIG REFACTORING using composer create-project drupal-composer/drupal-project

web/modules/custom/materio_id/materio_id.info.yml

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+name: Materio Id
+type: module
+description: "Compute automaticly materials references : <family>-<index>, eg. W-0459."
+core: 8.x
+package: Materio
+dependencies:
+  - computed_field
+
+# config_devel:
+#  install:

web/modules/custom/materio_id/materio_id.module

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+<?php
+
+
+function computed_field_field_index_compute($entity_type_manager, $entity, $fields, $delta){
+  // drush_print($entity->field_index->value);
+  if (!empty($entity->field_index->value)) {  // the node is not new
+	  return $entity->field_index->value;
+	}
+
+
+  /* FROM D7
+
+  // dsm('-- computed --');
+	// dsm($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, $delta) {
+  if (!empty($entity->field_reference->value)) {  // the node is not new
+    return $entity->field_reference->value;
+  }
+
+  /* FROM D7
+
+	// dsm('-- computed --');
+	// 	dsm($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'];
+// }