Fixed a bug when setting a config var before getting one

openslides/config/api.py

@@ -34,7 +34,12 @@ class ConfigHandler(object):
         updated_rows = ConfigStore.objects.filter(key=key).update(value=value)
         if not updated_rows:
             ConfigStore.objects.create(key=key, value=value)
-        self._cache[key] = value
+        try:
+            self._cache[key] = value
+        except AttributeError:
+            # This happens, when a config-var is set, before __getitem__ was
+            # called. In this case nothing should happen.
+            pass
 
     def setup_cache(self):
         """

openslides/utils/test.py

@@ -25,5 +25,6 @@ class TestCase(_TestCase):
     def _pre_setup(self, *args, **kwargs):
         return_value = super(TestCase, self)._pre_setup(*args, **kwargs)
         post_database_setup.send(sender=self)
-        config.setup_cache()
+        # Resetting the config object by deleting the cache
+        del config._cache
         return return_value

tests/config/test_config.py

@@ -44,6 +44,10 @@ class HandleConfigTest(TestCase):
         config_signal.disconnect(set_simple_config_page_multiple_vars, dispatch_uid='set_simple_config_page_multiple_vars_for_testing')
 
     def test_database_queries(self):
+        """
+        Test that no database queries are send, after the cache was created.
+        """
+        config.setup_cache()
         self.assertNumQueries(0, self.get_config_var, key='string_var')
 
     def test_setup_config_var(self):
@@ -57,13 +61,18 @@ class HandleConfigTest(TestCase):
         self.assertEqual(config['string_var'], 'other_special_unique_string dauTex9eAiy7jeen')
 
     def test_missing_cache_(self):
-        del config._cache
         self.assertEqual(config['string_var'], 'default_string_rien4ooCZieng6ah')
 
     def test_config_contains(self):
         self.assertTrue('string_var' in config)
         self.assertFalse('unknown_config_var' in config)
 
+    def test_set_value_before_getting_it(self):
+        """
+        Try to call __setitem__ before __getitem.
+        """
+        config['my_config_var'] = 'value'
+
 
 class ConfigFormTest(TestCase):