don't show batch actions if no table data is available

bug 925671

Change-Id: I5e97d059f6f02f033f8dfb9aede01de75e514c98

horizon/horizon/tables/actions.py

@@ -57,6 +57,12 @@ class BaseAction(object):
         """
         return True
 
+    def _allowed(self, request, datum):
+        """ Default allowed checks for certain actions """
+        if isinstance(self, BatchAction) and not self.table.data:
+            return False
+        return self.allowed(request, datum)
+
     def update(self, request, datum):
         """ Allows per-action customization based on current conditions.
 

horizon/horizon/tables/base.py

@@ -665,7 +665,7 @@ class DataTable(object):
     def _filter_action(self, action, request, datum=None):
         try:
             # Catch user errors in permission functions here
-            return action.allowed(request, datum)
+            return action._allowed(request, datum)
         except Exception:
             LOG.exception("Error while checking action permissions.")
             return None

horizon/horizon/tests/table_tests.py

@@ -475,6 +475,23 @@ class DataTableTests(test.TestCase):
         self.assertEqual(list(req._messages)[0].message,
                          "Please select a row before taking that action.")
 
+        # At least one object in table
+        # BatchAction is available
+        req = self.factory.get('/my_url/')
+        self.table = MyTable(req, TEST_DATA_2)
+        self.assertQuerysetEqual(self.table.get_table_actions(),
+                                 ['<MyFilterAction: filter>',
+                                  '<MyAction: delete>',
+                                  '<MyBatchAction: batch>'])
+
+        # Zero objects in table
+        # BatchAction not available
+        req = self.factory.get('/my_url/')
+        self.table = MyTable(req, None)
+        self.assertQuerysetEqual(self.table.get_table_actions(),
+                                 ['<MyFilterAction: filter>',
+                                  '<MyAction: delete>'])
+
         # Filtering
         action_string = "my_table__filter__q"
         req = self.factory.post('/my_url/', {action_string: '2'})