Fix issues between mute_signals() and factory inheritance (Closes #183).

Previously, if a factory was decorated with ``@mute_signals`` and one of
its descendant called another one of its descendant, signals weren't
unmuted properly.

3 files changed, 32 insertions, 2 deletions

diff --git a/docs/changelog.rst b/docs/changelog.rst
index 13fdd68..0cf8368 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -12,6 +12,10 @@ ChangeLog
     - Add support for getting/setting :mod:`factory.fuzzy`'s random state (see :issue:`175`, :issue:`185`).
     - Support lazy evaluation of iterables in :class:`factory.fuzzy.FuzzyChoice` (see :issue:`184`).
 
+*Bugfix:*
+
+    - Avoid issues when using :meth:`factory.django.mute_signals` on a base factory class (see :issue:`183`).
+
 *Deprecation:*
 
     - Remove deprecated features from :ref:`v2.4.0`
diff --git a/factory/django.py b/factory/django.py
index 7050366..e823ee9 100644
--- a/factory/django.py
+++ b/factory/django.py
@@ -269,6 +269,9 @@ class mute_signals(object):
             signal.receivers = receivers
         self.paused = {}
 
+    def copy(self):
+        return mute_signals(*self.signals)
+
     def __call__(self, callable_obj):
         if isinstance(callable_obj, base.FactoryMetaClass):
             # Retrieve __func__, the *actual* callable object.
@@ -277,7 +280,8 @@ class mute_signals(object):
             @classmethod
             @functools.wraps(generate_method)
             def wrapped_generate(*args, **kwargs):
-                with self:
+                # A mute_signals() object is not reentrant; use a copy everytime.
+                with self.copy():
                     return generate_method(*args, **kwargs)
 
             callable_obj._generate = wrapped_generate
@@ -286,7 +290,8 @@ class mute_signals(object):
         else:
             @functools.wraps(callable_obj)
             def wrapper(*args, **kwargs):
-                with self:
+                # A mute_signals() object is not reentrant; use a copy everytime.
+                with self.copy():
                     return callable_obj(*args, **kwargs)
             return wrapper
 
diff --git a/tests/test_django.py b/tests/test_django.py
index 0cbef19..4653305 100644
--- a/tests/test_django.py
+++ b/tests/test_django.py
@@ -592,6 +592,27 @@ class PreventSignalsTestCase(unittest.TestCase):
 
         self.assertSignalsReactivated()
 
+    def test_class_decorator_with_subfactory(self):
+        @factory.django.mute_signals(signals.pre_save, signals.post_save)
+        class WithSignalsDecoratedFactory(factory.django.DjangoModelFactory):
+            class Meta:
+                model = models.WithSignals
+
+            @factory.post_generation
+            def post(obj, create, extracted, **kwargs):
+                if not extracted:
+                    WithSignalsDecoratedFactory.create(post=42)
+
+        # This will disable the signals (twice), create two objects,
+        # and reactivate the signals.
+        WithSignalsDecoratedFactory()
+
+        self.assertEqual(self.handlers.pre_init.call_count, 2)
+        self.assertFalse(self.handlers.pre_save.called)
+        self.assertFalse(self.handlers.post_save.called)
+
+        self.assertSignalsReactivated()
+
     def test_class_decorator_build(self):
         @factory.django.mute_signals(signals.pre_save, signals.post_save)
         class WithSignalsDecoratedFactory(factory.django.DjangoModelFactory):