Add mutual_friends method and it's tests. this will bump the version …

…to 0.0.2

relationships/relationship.py

@@ -1,4 +1,5 @@
 
+
 import redis
 
 from keys import key_list as default_key_list
@@ -81,6 +82,11 @@ def friends(self):
             "user:{}:{}".format(self._get_actor(), self.key_list["followers"]),
         )
 
+    def mutual_friends(self, to_id):
+        actor_friends, to_id_friends = self(self._get_actor()).friends(), self(to_id).friends()
+
+        return actor_friends.intersection(to_id_friends)
+
     def followers(self):
         return self._list_call(self.key_list["followers"])
 

setup.py

@@ -0,0 +1,15 @@
+from setuptools import setup
+
+setup(
+    name='relationships',
+    version='0.0.2',
+    packages=['relationships'],
+    url='http://github.com/emre/relationships',
+    license='MIT',
+    author='Emre Yilmaz',
+    author_email='[email protected]',
+    description='redis backed user relationships',
+    install_requires=['redis'],
+
+)
+

tests.py

@@ -151,6 +151,27 @@ def test_blocked_by(self):
 
         self.assertEqual(r(100).blocked(), set(['10000', '10001', '10002']))
 
+    def test_mutual_friends(self):
+
+        r = Relationship(redis_connection=self.redis_connection)
+
+        r('Emre').follow('Aydan')
+        r('Aydan').follow('Emre')
+
+        r('Emre').follow('Samed')
+        r('Samed').follow('Emre')
+
+        r('Emre').follow('Fka')
+        r('Fka').follow('Emre')
+
+        r('Fka').follow('Aydan')
+        r('Aydan').follow('Fka')
+
+        r('Fka').follow('Samed')
+        r('Samed').follow('Fka')
+
+        self.assertEqual(r('Emre').mutual_friends('Fka'), set(['Samed', 'Aydan']))
+
 
 if __name__ == '__main__':
     unittest.main()