Missing feature: a user/group cannot be selected twice.

The feature of not selecting an item twice was removed in select2 v4. So we implement it ourselves by filtering out pre-selected items in the processResults callback.

This MR is based on /uis/devops/django/ucamlookup/merge_requests/13 which should be reviewed first.

closes: #15 (closed)

ucamlookup/templates/ucamlookup_groups.html

@@ -34,8 +34,13 @@
         processResults: function (data) {
           if (data.searchId_g != searchId_g)
             return;
+          // create the set of current selections
+          var groupids = new Set($select.select2('data').map(function(item) {return item.id}));
+          // filter out any results that are currently selected
           return {
-            results: $.map(data.groups, function(group) {
+            results: data.groups.filter(function(group) {
+              return ! groupids.has(group.groupid)
+            }).map(function(group) {
               return create_data(group.groupid, group.title)
             })
           };