Fix bug with registration of identical views with same 'accept'.

2 files changed, 32 insertions, 6 deletions

diff --git a/pyramid/config/views.py b/pyramid/config/views.py
index 3cca1c7c5..d9507136f 100644
--- a/pyramid/config/views.py
+++ b/pyramid/config/views.py
@@ -513,8 +513,13 @@ class MultiView(object):
             self.views.sort(key=operator.itemgetter(0))
         else:
             subset = self.media_views.setdefault(accept, [])
-            subset.append((order, view, phash))
-            subset.sort()
+            for i, (s, v, h) in enumerate(list(subset)):
+                if phash == h and order == s:
+                    subset[i] = (order, view, phash)
+                    return
+            else:
+                subset.append((order, view, phash))
+                subset.sort()
             accepts = set(self.accepts)
             accepts.add(accept)
             self.accepts = list(accepts) # dedupe
diff --git a/pyramid/tests/test_config/test_views.py b/pyramid/tests/test_config/test_views.py
index aa4c03db6..5ec63beab 100644
--- a/pyramid/tests/test_config/test_views.py
+++ b/pyramid/tests/test_config/test_views.py
@@ -621,6 +621,24 @@ class TestViewsConfigurationMixin(unittest.TestCase):
         request.accept = DummyAccept('text/html', 'text/html')
         self.assertEqual(wrapper(None, request), 'OK2')
 
+    def test_add_views_with_accept_multiview_replaces_existing(self):
+        from pyramid.renderers import null_renderer
+        def view(context, request):
+            return 'OK'
+        def view2(context, request):
+            return 'OK2'
+        def view3(context, request):
+            return 'OK3'
+        config = self._makeOne(autocommit=True)
+        config.add_view(view=view, renderer=null_renderer)
+        config.add_view(view=view2, accept='text/html', renderer=null_renderer)
+        config.add_view(view=view3, accept='text/html', renderer=null_renderer)
+        wrapper = self._getViewCallable(config)
+        self.assertEqual(wrapper(None, None), 'OK')
+        request = DummyRequest()
+        request.accept = DummyAccept('text/html', 'text/html')
+        self.assertEqual(wrapper(None, request), 'OK3')
+
     def test_add_view_exc_with_accept_multiview_replaces_existing_view(self):
         from pyramid.renderers import null_renderer
         from zope.interface import implementedBy
@@ -1963,12 +1981,15 @@ class TestMultiView(unittest.TestCase):
         mv.add('view4', 99, 'text/html')
         self.assertEqual(mv.media_views['text/html'],
                          [(99, 'view4', None), (100, 'view3', None)])
-        mv.add('view5', 100, 'text/xml')
-        self.assertEqual(mv.media_views['text/xml'], [(100, 'view5', None)])
+        mv.add('view5', 100, 'text/html')
+        self.assertEqual(mv.media_views['text/html'],
+                         [(99, 'view4', None), (100, 'view5', None)])
+        mv.add('view6', 100, 'text/xml')
+        self.assertEqual(mv.media_views['text/xml'], [(100, 'view6', None)])
         self.assertEqual(set(mv.accepts), set(['text/xml', 'text/html']))
         self.assertEqual(mv.views, [(99, 'view2', None), (100, 'view', None)])
-        mv.add('view6', 98, 'text/*')
-        self.assertEqual(mv.views, [(98, 'view6', None),
+        mv.add('view7', 98, 'text/*')
+        self.assertEqual(mv.views, [(98, 'view7', None),
                                     (99, 'view2', None),
                                     (100, 'view', None)])