Merge pull request #45 from biblibre/add-alphabetic-facet-sort

Add index order sorting on facet

Author: ThibaudGLT

src/Adapter.php

@@ -191,4 +191,14 @@ public function getAvailableOperators(SearchIndexRepresentation $index)
 
         return $operators;
     }
+
+    public function getAvailableFacetSorts(SearchIndexRepresentation $index)
+    {
+        $sorts = [
+            'index asc' => $this->translator->translate('Index order asc'),
+            'index desc' => $this->translator->translate('Index order desc'),
+        ];
+
+        return $sorts;
+    }
 }

src/Querier.php

@@ -255,6 +255,13 @@ public function query(Query $query)
             $solrQuery->setGroupOffset($offset);
         }
 
+        $facetSorts = $query->getFacetSorts();
+        foreach ($facetSorts as $field => $sort) {
+            $searchField = $this->getSearchField($field);
+            $facetField = $searchField->facetField();
+            $solrQuery->setParam("facet.sort.$facetField", $sort);
+        }
+
         $eventManager->setIdentifiers(['Solr\Querier']);
         $eventManager->trigger('solr.query', $solrQuery, ['query' => $query, 'solrNode' => $solrNode]);
 

src/SolrQuery.php

@@ -33,7 +33,12 @@ public function jsonSerialize(): mixed
             $data['facet'] = [];
             $limit = $params['facet.limit'] ?? null;
             foreach ($params['facet.field'] as $field) {
-                $data['facet'][$field] = ['type' => 'terms', 'field' => $field];
+                if(isset($params["facet.sort.$field"])){
+                    $sort = $params["facet.sort.$field"] != '' ? $params["facet.sort.$field"] : 'count';
+                    $data['facet'][$field] = ['type' => 'terms', 'field' => $field, 'sort' => $sort];
+                } else {
+                    unset($params["facet.sort.$field"]);
+                }
                 if (isset($limit)) {
                     $data['facet'][$field]['limit'] = (int) $limit;
                 }