Default path_transformer=None. Fixes #199

vcr/cassette.py

@@ -75,7 +75,7 @@ class CassetteContextDecorator(object):
             lambda key, _: key in self._non_cassette_arguments,
             self._args_getter()
         )
-        if 'path_transformer' in other_kwargs:
+        if other_kwargs.get('path_transformer'):
             transformer = other_kwargs['path_transformer']
             cassette_kwargs['path'] = transformer(cassette_kwargs['path'])
         self.__finish = self._patch_generator(self.cls.load(**cassette_kwargs))

vcr/config.py

@@ -23,7 +23,7 @@ class VCR(object):
             return path
         return ensure
 
-    def __init__(self, path_transformer=lambda x: x, before_record_request=None,
+    def __init__(self, path_transformer=None, before_record_request=None,
                  custom_patches=(), filter_query_parameters=(), ignore_hosts=(),
                  record_mode="once", ignore_localhost=False, filter_headers=(),
                  before_record_response=None, filter_post_data_parameters=(),
@@ -108,7 +108,7 @@ class VCR(object):
         matcher_names = kwargs.get('match_on', self.match_on)
         path_transformer = kwargs.get(
             'path_transformer',
-            self.path_transformer or self.ensure_suffix('.yaml')
+            self.path_transformer
         )
         func_path_generator = kwargs.get(
             'func_path_generator',

vcr/util.py

@@ -81,8 +81,9 @@ def partition_dict(predicate, dictionary):
 def compose(*functions):
     def composed(incoming):
         res = incoming
-        for function in functions[::-1]:
-            res = function(res)
+        for function in reversed(functions):
+            if function:
+                res = function(res)
         return res
     return composed