Add the ability to combine MethodViews

flask/views.py

@@ -102,12 +102,16 @@ def view(*args, **kwargs):
         return view
 
 
+def get_methods(cls):
+    return getattr(cls, 'methods', []) or []
+
+
 class MethodViewType(type):
 
     def __new__(cls, name, bases, d):
         rv = type.__new__(cls, name, bases, d)
         if 'methods' not in d:
-            methods = set(rv.methods or [])
+            methods = set(m for b in bases for m in get_methods(b))
             for key in d:
                 if key in http_method_funcs:
                     methods.add(key.upper())

tests/test_views.py

@@ -160,3 +160,45 @@ def dispatch_request(self):
 
     # But these tests should still pass. We just log a warning.
     common_test(app)
+
+def test_multiple_inheritance():
+    app = flask.Flask(__name__)
+
+    class GetView(flask.views.MethodView):
+        def get(self):
+            return 'GET'
+
+    class DeleteView(flask.views.MethodView):
+        def delete(self):
+            return 'DELETE'
+
+    class GetDeleteView(GetView, DeleteView):
+        pass
+
+    app.add_url_rule('/', view_func=GetDeleteView.as_view('index'))
+
+    c = app.test_client()
+    assert c.get('/').data == b'GET'
+    assert c.delete('/').data == b'DELETE'
+    assert sorted(GetDeleteView.methods) == ['DELETE', 'GET']
+
+def test_remove_method_from_parent():
+    app = flask.Flask(__name__)
+
+    class GetView(flask.views.MethodView):
+        def get(self):
+            return 'GET'
+
+    class OtherView(flask.views.MethodView):
+        def post(self):
+            return 'POST'
+
+    class View(GetView, OtherView):
+        methods = ['GET']
+
+    app.add_url_rule('/', view_func=View.as_view('index'))
+
+    c = app.test_client()
+    assert c.get('/').data == b'GET'
+    assert c.post('/').status_code == 405
+    assert sorted(View.methods) == ['GET']