Add pseudo-delta support for relations.

pseudo-delta-support

diff --git a/ting_reference.module b/ting_reference.module
index 29400f5..de5c722 100644
--- a/ting_reference.module
+++ b/ting_reference.module
@@ -132,39 +132,21 @@ function ting_reference_field_update($entity_type, $entity, $field, $instance, $
   // Get existing relations.
   $relations = ting_reference_get_relations($entity_type, $entity);
 
-  // Book keeping.
-  $keep = array();
-  $clear_cache = FALSE;
+  // Since there is no way to update the delta value of the endpoints, we need
+  // to delete all relations, and re-add them.
+  foreach ($relations as $rid => $relation) {
+    relation_delete($rid);
+  }
 
   // Loop through items, create new and mark existing to be kept.
   foreach ($items as $item) {
     if (!empty($item['tid'])) {
-      $found = FALSE;
-      foreach ($relations as $relation) {
-        if ($relation->endpoints['und'][1]['entity_id'] == $item['tid']) {
-          $keep[$relation->rid] = $relation->rid;
-          $found = TRUE;
-          break;
-        }
-      }
-      if (!$found) {
-        ting_reference_create_relation($entity_type, $entity_id, $item['tid']);
-        $clear_cache = TRUE;
-      }
+      ting_reference_create_relation($entity_type, $entity_id, $item['tid']);
     }
   }
 
-  // Clear cache if needed.
-  if ($clear_cache) {
-    field_cache_clear('field:' . $entity_type . ':' . $entity_id);
-  }
-
-  // Delete the relations that aren't present anymore.
-  foreach ($relations as $rid => $relation) {
-    if (!in_array($rid, $keep)) {
-      relation_delete($rid);
-    }
-  }
+  // Clear cache.
+  field_cache_clear('field:' . $entity_type . ':' . $entity_id);
 }
 
 /**
@@ -447,6 +429,7 @@ function ting_reference_get_relations($entity_type, $entity) {
       ->condition('bundle', 'ting_reference')
       ->condition('endpoints_entity_type', $entity_type)
       ->condition('endpoints_entity_id', $entity_id)
+      ->orderBy('endpoints.entity_id')
       ->execute()
       ->fetchAllAssoc('entity_id');