Fix multidict.__iter__

Author: asvetlov

CHANGES.txt

@@ -7,6 +7,8 @@ CHANGES
 - aiohttp.web.HTTPException and descendants now files response body
   with string like `400: NotFound`
 
+- Fix multidict __iter__, the method should iterate over keys, not (key, value) pairs.
+
 0.10.0 (11-13-2014)
 -------------------
 

aiohttp/multidict.py

@@ -86,7 +86,7 @@ def __getitem__(self, key):
         raise KeyError(key)
 
     def __iter__(self):
-        return iter(self._items)
+        return iter(self.keys())
 
     def __len__(self):
         return len(self._items)

tests/test_multidict.py

@@ -76,6 +76,10 @@ def test_copy(self):
         self.assertEqual(d1, d2)
         self.assertIsNot(d1, d2)
 
+    def test__iter__(self):
+        d = self.make_dict([('key', 'one'), ('key2', 'two'), ('key', 3)])
+        self.assertEqual(['key', 'key2'], list(d))
+
     def test_keys__contains(self):
         d = self.make_dict([('key', 'one'), ('key2', 'two'), ('key', 3)])
         self.assertEqual(list(d.keys()), ['key', 'key2'])