diff --git a/src/calibre/library/caches.py b/src/calibre/library/caches.py
index 3877314da9..68ed4cc092 100644
--- a/src/calibre/library/caches.py
+++ b/src/calibre/library/caches.py
@@ -176,6 +176,11 @@ class ResultCache(SearchQueryParser):
             if x is not None:
                 yield x
 
+    def iterallids(self):
+        idx = self.FIELD_MAP['id']
+        for x in self.iterall():
+            yield x[idx]
+
     def universal_set(self):
         return set([i[0] for i in self._data if i is not None])