Add vufind_sort option to [Loans] in Folio.ini

config/vufind/Folio.ini

@@ -236,11 +236,42 @@ in_transit[] = "Open - Awaiting delivery"
 ; the system will attempt to reconcile the global page size config there with the
 ; available options defined here.
 page_size[] = 50
-; Sort options
-;sort[dueDate/sort.ascending] = sort_due_date_asc
-;sort[dueDate/sort.descending] = sort_due_date_desc
+
+; Sort options available in the "Checked Out Items" screen.
+; These will be passed through to the FOLIO API as sortby parameters
+; unless configured as a key in the vufind_sort option to be used
+; to sort the items after they are returned from the API.
+;
+; This should be filled out as: sort[FOLIO_SORTBY_PARAM] or sort[VUFIND_SORT_KEY]
+; with the value being the display label.
+; For example to use FOLIO API sort, sort[itemId/sort.ascending] will pass
+; the value 'itemId/sort.ascending' to the sortby parameter of the FOLIO API.
+; To use the VuFind sort, sort[title] will check the vufind_sort[] for a key of title
+; and sort by that option's value.
+;
+; Note: When choosing a FOLIO sort parameter, ensure that you choose
+; field(s) that will return the records in a consistent order so that
+; when paginating you will get all of the records in the same order for
+; every page of results without possibly having duplicates appear or missing items.
+; For example, using just dueDate will cause problems if there are more than
+; your page_size of items due on the same day since the order is not guaranteed to be
+; the same for non-unique values.
+sort[dueDate/sort.ascending itemId/sort.ascending] = sort_due_date_asc
+sort[dueDate/sort.descending itemId/sort.ascending] = sort_due_date_desc
+;sort[title] = sort_title
+
+; This optional setting sorts the results using a natural sort algorithm on the
+; specified field of the VuFind checked out items output, which can be useful when FOLIO's
+; native sort does not allow sorting on the desired field.
+; If used, the key here should match the key used in the sort[] option and the value should
+; be the field within the check out items output to sort by.
+; For example, if you have sort[title] = sort_title then you could set vufind_sort[title] = "title"
+; to create a sort option by the "title" field with a display label of sort_title.
+; See the getMyTransactions function for a full list of the available fields.
+;vufind_sort[title] = "title"
+
 ; Default sort (note: this must be defined in the sort[] options above to be applied!)
-;default_sort=dueDate/sort.ascending
+default_sort="dueDate/sort.ascending itemId/sort.ascending"
 
 [CourseReserves]
 ; If set to true, the course number will be prefixed on the course name; if false,

module/VuFind/src/VuFind/ILS/Driver/Folio.php

@@ -1144,19 +1144,32 @@ protected function formatHoldingItem(
      * @return array
      */
     protected function sortHoldings(array $holdings, string $sortField): array
+    {
+        return $this->sortArray($holdings, $sortField);
+    }
+
+    /**
+     * Given an array and a sort field, sort the array.
+     *
+     * @param array  $data      Array to sort
+     * @param string $sortField Sort field
+     *
+     * @return array
+     */
+    protected function sortArray(array $data, string $sortField): array
     {
         usort(
-            $holdings,
+            $data,
             function ($a, $b) use ($sortField) {
                 return strnatcasecmp($a[$sortField], $b[$sortField]);
             }
         );
         // Renumber the re-sorted batch:
-        $nbCount = count($holdings);
+        $nbCount = count($data);
         for ($nbIndex = 0; $nbIndex < $nbCount; $nbIndex++) {
-            $holdings[$nbIndex]['number'] = $nbIndex + 1;
+            $data[$nbIndex]['number'] = $nbIndex + 1;
         }
-        return $holdings;
+        return $data;
     }
 
     /**
@@ -1828,9 +1841,13 @@ public function getMyTransactions($patron, $params = [])
     {
         $limit = $params['limit'] ?? 1000;
         $offset = isset($params['page']) ? ($params['page'] - 1) * $limit : 0;
+        $vufindSortMap = $this->config['Loans']['vufind_sort'] ?? [];
+        $requestedSort = $params['sort'] ?? '';
+        $localSortField = $vufindSortMap[$requestedSort] ?? null;
 
         $query = 'userId==' . $patron['id'] . ' and status.name==Open';
-        if (isset($params['sort'])) {
+        // Only pass sort to API if it is NOT handled locally by VuFind
+        if (!empty($requestedSort) && !$localSortField) {
             $query .= ' sortby ' . $this->escapeCql($params['sort']);
         }
         $resultPage = $this->getResultPage('/circulation/loans', compact('query'), $offset, $limit);
@@ -1873,6 +1890,11 @@ public function getMyTransactions($patron, $params = [])
             // safer to do a separate lookup to be sure we have the right number!
             $count = $this->getResultCount('/circulation/loans', compact('query'));
         }
+        // Add in post-sort if the sort param was used in the vufind_sort config
+        if ($localSortField) {
+            $transactions = $this->sortArray($transactions, $localSortField);
+        }
+
         return ['count' => $count, 'records' => $transactions];
     }