diff --git a/channels/binding/websockets.py b/channels/binding/websockets.py
index e0d0d3d..76a442b 100644
--- a/channels/binding/websockets.py
+++ b/channels/binding/websockets.py
@@ -110,7 +110,8 @@ class WebsocketBinding(Binding):
         instance = self.model.objects.get(pk=pk)
         hydrated = self._hydrate(pk, data)
         for name in data.keys():
-            setattr(instance, name, getattr(hydrated.object, name))
+            if name in self.fields or self.fields == ['__all__']:
+                setattr(instance, name, getattr(hydrated.object, name))
         instance.save()
 
 
diff --git a/channels/tests/test_binding.py b/channels/tests/test_binding.py
index aaf88aa..56af79b 100644
--- a/channels/tests/test_binding.py
+++ b/channels/tests/test_binding.py
@@ -1,9 +1,12 @@
 from __future__ import unicode_literals
+import json
 
 from django.contrib.auth import get_user_model
+from channels.binding.base import CREATE, UPDATE, DELETE
 from channels.binding.websockets import WebsocketBinding
+from channels.generic.websockets import WebsocketDemultiplexer
 from channels.tests import ChannelTestCase, apply_routes, HttpClient
-from channels import route
+from channels import route, Group
 
 User = get_user_model()
 
@@ -134,3 +137,220 @@ class TestsBinding(ChannelTestCase):
 
             received = client.receive()
             self.assertIsNone(received)
+
+    def test_demultiplexer(self):
+        class Demultiplexer(WebsocketDemultiplexer):
+            mapping = {
+                'users': 'binding.users',
+            }
+
+            groups = ['inbound']
+
+        with apply_routes([Demultiplexer.as_route(path='/')]):
+            client = HttpClient()
+            client.send_and_consume('websocket.connect', path='/')
+
+            # assert in group
+            Group('inbound').send({'text': json.dumps({'test': 'yes'})})
+            self.assertEqual(client.receive(), {'test': 'yes'})
+
+            # assert that demultiplexer stream message
+            client.send_and_consume('websocket.receive', path='/',
+                                    text={'stream': 'users', 'payload': {'test': 'yes'}})
+            message = client.get_next_message('binding.users')
+            self.assertIsNotNone(message)
+            self.assertEqual(message.content['test'], 'yes')
+
+    def test_demultiplexer_with_wrong_stream(self):
+        class Demultiplexer(WebsocketDemultiplexer):
+            mapping = {
+                'users': 'binding.users',
+            }
+
+            groups = ['inbound']
+
+        with apply_routes([Demultiplexer.as_route(path='/')]):
+            client = HttpClient()
+            client.send_and_consume('websocket.connect', path='/')
+
+            with self.assertRaises(ValueError) as value_error:
+                client.send_and_consume('websocket.receive', path='/', text={
+                    'stream': 'wrong', 'payload': {'test': 'yes'}
+                })
+
+            self.assertIn('stream not mapped', value_error.exception.args[0])
+
+            message = client.get_next_message('binding.users')
+            self.assertIsNone(message)
+
+    def test_demultiplexer_with_wrong_payload(self):
+        class Demultiplexer(WebsocketDemultiplexer):
+            mapping = {
+                'users': 'binding.users',
+            }
+
+            groups = ['inbound']
+
+        with apply_routes([Demultiplexer.as_route(path='/')]):
+            client = HttpClient()
+            client.send_and_consume('websocket.connect', path='/')
+
+            with self.assertRaises(ValueError) as value_error:
+                client.send_and_consume('websocket.receive', path='/', text={
+                    'stream': 'users', 'payload': 'test',
+                })
+
+            self.assertEqual(value_error.exception.args[0], 'Multiplexed frame payload is not a dict')
+
+            message = client.get_next_message('binding.users')
+            self.assertIsNone(message)
+
+    def test_demultiplexer_without_payload_and_steam(self):
+        class Demultiplexer(WebsocketDemultiplexer):
+            mapping = {
+                'users': 'binding.users',
+            }
+
+            groups = ['inbound']
+
+        with apply_routes([Demultiplexer.as_route(path='/')]):
+            client = HttpClient()
+            client.send_and_consume('websocket.connect', path='/')
+
+            with self.assertRaises(ValueError) as value_error:
+                client.send_and_consume('websocket.receive', path='/', text={
+                    'nostream': 'users', 'payload': 'test',
+                })
+
+            self.assertIn('no channel/payload key', value_error.exception.args[0])
+
+            message = client.get_next_message('binding.users')
+            self.assertIsNone(message)
+
+            with self.assertRaises(ValueError) as value_error:
+                client.send_and_consume('websocket.receive', path='/', text={
+                    'stream': 'users',
+                })
+
+            self.assertIn('no channel/payload key', value_error.exception.args[0])
+
+            message = client.get_next_message('binding.users')
+            self.assertIsNone(message)
+
+    def test_inbound_create(self):
+        self.assertEqual(User.objects.all().count(), 0)
+
+        class Demultiplexer(WebsocketDemultiplexer):
+            mapping = {
+                'users': 'binding.users',
+            }
+
+            groups = ['inbound']
+
+        class UserBinding(WebsocketBinding):
+            model = User
+            stream = 'users'
+            fields = ['username', 'email', 'password', 'last_name']
+
+            @classmethod
+            def group_names(cls, instance, action):
+                return ['users_outbound']
+
+            def has_permission(self, user, action, pk):
+                return True
+
+        with apply_routes([Demultiplexer.as_route(path='/'), route('binding.users', UserBinding.consumer)]):
+            client = HttpClient()
+            client.send_and_consume('websocket.connect', path='/')
+            client.send_and_consume('websocket.receive', path='/', text={
+                'stream': 'users',
+                'payload': {'action': CREATE, 'data': {'username': 'test_inbound', 'email': 'test@user_steam.com'}}
+            })
+            # our Demultiplexer route message to the inbound consumer, so call Demultiplexer consumer
+            client.consume('binding.users')
+
+        self.assertEqual(User.objects.all().count(), 1)
+        user = User.objects.all().first()
+        self.assertEqual(user.username, 'test_inbound')
+        self.assertEqual(user.email, 'test@user_steam.com')
+
+    def test_inbound_update(self):
+        user = User.objects.create(username='test', email='test@channels.com')
+
+        class Demultiplexer(WebsocketDemultiplexer):
+            mapping = {
+                'users': 'binding.users',
+            }
+
+            groups = ['inbound']
+
+        class UserBinding(WebsocketBinding):
+            model = User
+            stream = 'users'
+            fields = ['username', ]
+
+            @classmethod
+            def group_names(cls, instance, action):
+                return ['users_outbound']
+
+            def has_permission(self, user, action, pk):
+                return True
+
+        with apply_routes([Demultiplexer.as_route(path='/'), route('binding.users', UserBinding.consumer)]):
+            client = HttpClient()
+            client.send_and_consume('websocket.connect', path='/')
+            client.send_and_consume('websocket.receive', path='/', text={
+                'stream': 'users',
+                'payload': {'action': UPDATE, 'pk': user.pk, 'data': {'username': 'test_inbound'}}
+            })
+            # our Demultiplexer route message to the inbound consumer, so call Demultiplexer consumer
+            client.consume('binding.users')
+
+            user = User.objects.get(pk=user.pk)
+            self.assertEqual(user.username, 'test_inbound')
+            self.assertEqual(user.email, 'test@channels.com')
+
+            # trying change field that not in binding fields
+            client.send_and_consume('websocket.receive', path='/', text={
+                'stream': 'users',
+                'payload': {'action': UPDATE, 'pk': user.pk, 'data': {'email': 'new@test.com'}}
+            })
+            client.consume('binding.users')
+
+            user = User.objects.get(pk=user.pk)
+            self.assertEqual(user.username, 'test_inbound')
+            self.assertEqual(user.email, 'test@channels.com')
+
+    def test_inbound_delete(self):
+        user = User.objects.create(username='test', email='test@channels.com')
+
+        class Demultiplexer(WebsocketDemultiplexer):
+            mapping = {
+                'users': 'binding.users',
+            }
+
+            groups = ['inbound']
+
+        class UserBinding(WebsocketBinding):
+            model = User
+            stream = 'users'
+            fields = ['username', ]
+
+            @classmethod
+            def group_names(cls, instance, action):
+                return ['users_outbound']
+
+            def has_permission(self, user, action, pk):
+                return True
+
+        with apply_routes([Demultiplexer.as_route(path='/'), route('binding.users', UserBinding.consumer)]):
+            client = HttpClient()
+            client.send_and_consume('websocket.connect', path='/')
+            client.send_and_consume('websocket.receive', path='/', text={
+                'stream': 'users',
+                'payload': {'action': DELETE, 'pk': user.pk}
+            })
+            # our Demultiplexer route message to the inbound consumer, so call Demultiplexer consumer
+            client.consume('binding.users')
+
+            self.assertIsNone(User.objects.filter(pk=user.pk).first())