Add Model classmethod proxies to Model.query.filter and Model.query.f…

…ilter_by.

alchy/model.py

@@ -347,6 +347,16 @@ def get_by(cls, data_dict=None, **kargs):
         data = data_dict if isinstance(data_dict, dict) else kargs
         return cls.query.filter_by(**data).first()
 
+    @classmethod
+    def filter(cls, *args, **kargs):
+        """Proxy to ``cls.query.filter()``"""
+        return cls.query.filter(*args, **kargs)
+
+    @classmethod
+    def filter_by(cls, *args, **kargs):
+        """Proxy to ``cls.query.filter_by()``"""
+        return cls.query.filter_by(*args, **kargs)
+
     ##
     # SQLAlchemy.inspect() based methods/properties
     ##

tests/test_model.py

@@ -302,6 +302,13 @@ def test_get_by(self):
             Foo.get_by(dict(string='Joe Smith')),
             self.db.query(Foo).filter_by(string='Joe Smith').first())
 
+    def test_filter(self):
+        self.assertEqual(str(Foo.filter()), str(self.db.query(Foo).filter()))
+
+    def test_filter_by(self):
+        self.assertEqual(str(Foo.filter_by()),
+                         str(self.db.query(Foo).filter_by()))
+
     def test_object_session(self):
         record = Foo.get(1)
         self.assertIs(record.object_session,