- Using ``model_url`` or ``model_path`` against a broken model graph

  (one with models that had a non-root model with a ``__name__`` of
  ``None``) caused an inscrutable error to be thrown: ( if not
  ``_must_quote[cachekey].search(s): TypeError: expected string or
  buffer``).  Now URLs and paths generated against graphs that have
  None names in intermediate nodes will replace the None with the
  empty string, and, as a result, the error won't be raised.  Of
  course the URL or path will still be bogus.
 

2 files changed, 27 insertions, 5 deletions

diff --git a/repoze/bfg/tests/test_traversal.py b/repoze/bfg/tests/test_traversal.py
index c911ebfed..9cdf04910 100644
--- a/repoze/bfg/tests/test_traversal.py
+++ b/repoze/bfg/tests/test_traversal.py
@@ -418,7 +418,6 @@ class ModelPathTests(unittest.TestCase):
         root = DummyContext()
         root.__parent__ = None
         root.__name__ = None
-        request = DummyRequest()
         result = self._callFUT(root)
         self.assertEqual(result, '/')
         
@@ -429,10 +428,22 @@ class ModelPathTests(unittest.TestCase):
         other = DummyContext()
         other.__parent__ = root
         other.__name__ = 'other'
-        request = DummyRequest()
         result = self._callFUT(other)
         self.assertEqual(result, '/other')
 
+    def test_path_with_None_itermediate_names(self):
+        root = DummyContext()
+        root.__parent__ = None
+        root.__name__ = None
+        other = DummyContext()
+        other.__parent__ = root
+        other.__name__ = None
+        other2 = DummyContext()
+        other2.__parent__ = other
+        other2.__name__ = 'other2'
+        result = self._callFUT(other2)
+        self.assertEqual(result, '//other2')
+
 class ModelPathTupleTests(unittest.TestCase):
     def _callFUT(self, model, *elements):
         from repoze.bfg.traversal import model_path_tuple
@@ -459,7 +470,6 @@ class ModelPathTupleTests(unittest.TestCase):
         root = DummyContext()
         root.__parent__ = None
         root.__name__ = None
-        request = DummyRequest()
         result = self._callFUT(root)
         self.assertEqual(result, ('',))
         
@@ -470,10 +480,22 @@ class ModelPathTupleTests(unittest.TestCase):
         other = DummyContext()
         other.__parent__ = root
         other.__name__ = 'other'
-        request = DummyRequest()
         result = self._callFUT(other)
         self.assertEqual(result, ('', 'other'))
 
+    def test_path_with_None_itermediate_names(self):
+        root = DummyContext()
+        root.__parent__ = None
+        root.__name__ = None
+        other = DummyContext()
+        other.__parent__ = root
+        other.__name__ = None
+        other2 = DummyContext()
+        other2.__parent__ = other
+        other2.__name__ = 'other2'
+        result = self._callFUT(other2)
+        self.assertEqual(result, ('', '', 'other2'))
+
 class QuotePathSegmentTests(unittest.TestCase):
     def _callFUT(self, s):
         from repoze.bfg.traversal import quote_path_segment
diff --git a/repoze/bfg/traversal.py b/repoze/bfg/traversal.py
index 02b6589ac..47ac5fa7f 100644
--- a/repoze/bfg/traversal.py
+++ b/repoze/bfg/traversal.py
@@ -213,7 +213,7 @@ def model_path_tuple(model, *elements):
 def _model_path_list(model, *elements):
     """ Implementation detail shared by model_path and model_path_tuple """
     lpath = reversed(list(lineage(model))[:-1])
-    path = [ location.__name__ for location in lpath ]
+    path = [ location.__name__ or '' for location in lpath ]
 
     if elements:
         path = path + list(elements)