added thesaurus ordered in sapi solr database index

web/modules/custom/materio_sapi/materio_sapi.module

@@ -67,3 +67,46 @@ function materio_sapi_preprocess_fieldset(&$variables) {
     $variables['legend']['attributes'] = new Attribute($variables['element']['#legend_attributes']);
   }
 }
+
+
+// ? https://happyculture.coop/blog/drupal-8-declarer-un-champ-extrafield-calcule-computed-field
+/**
+ * Implements hook_entity_bundle_field_info().
+ */
+function materio_sapi_entity_bundle_field_info(\Drupal\Core\Entity\EntityTypeInterface $entity_type, $bundle, array $base_field_definitions) {
+  $fields = [];
+  if ($entity_type->id() == 'node') {
+    if ($bundle == 'materiau') {
+      for ($i=0; $i < 5 ; $i++) { 
+        $fields["thesaurus_$i"] = \Drupal\Core\Field\BaseFieldDefinition::create('entity_reference')
+          ->setLabel(t("Thesaurus $i"))
+          ->setComputed(TRUE)
+          ->setSetting('target_type', 'taxonomy_term')
+          ->setSetting('handler_settings',['target_bundles'=>['thesaurus'=>'thesaurus']] )
+          ->setClass('\Drupal\materio_sapi\ThesaurusRefComputed')
+          ->setDisplayConfigurable('view', FALSE);
+      }
+    }
+  }
+  return $fields;
+}
+
+
+// ? https://www.webomelette.com/creating-pseudo-fields-drupal-8
+// /**
+//  * Implements hook_entity_extra_field_info().
+//  */
+// function materio_sapi_entity_extra_field_info() {
+//   $extra = array();
+
+//   foreach (NodeType::loadMultiple() as $bundle) {
+//     $extra['node'][$bundle->Id()]['display']['my_own_pseudo_field'] = array(
+//       'label' => t('My own field'),
+//       'description' => t('This is my own pseudo-field'),
+//       'weight' => 100,
+//       'visible' => false,
+//     );
+//   }
+
+//   return $extra;
+// }

web/modules/custom/materio_sapi/src/ThesaurusRefComputed.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace Drupal\materio_sapi;
+
+use Drupal\Core\Field\EntityReferenceFieldItemList;
+use Drupal\Core\TypedData\ComputedItemListTrait;
+
+class ThesaurusRefComputed extends EntityReferenceFieldItemList {
+  use ComputedItemListTrait;
+
+  /**
+   * Computed related blog posts.
+   */
+  protected function computeValue() {
+    $field_name = $this->getName();
+    switch ($field_name) {
+      case 'thesaurus_0':
+        $delta = 0;
+        break;
+      case 'thesaurus_1':
+        $delta = 1;
+        break;
+      case 'thesaurus_2':
+        $delta = 2;
+        break;
+      case 'thesaurus_3':
+        $delta = 3;
+        break;
+      case 'thesaurus_4':
+        $delta = 4;
+        break;
+      default:
+        $delta = -1;
+        break;
+    }
+
+    $thes_terms = $this->getParent()->getValue()->get('field_thesaurus')->getValue();
+
+    if (count($thes_terms) > 0) {
+      if (isset($thes_terms[$delta])) {
+        $term = $thes_terms[$delta];
+        $this->list[0] = $this->createItem(0, $term);
+        $t="t";
+      }
+    }
+  }
+}