diff --git a/src/ralph/cmdb/api.py b/src/ralph/cmdb/api.py
index e643b283a2..8411e8d6fd 100644
--- a/src/ralph/cmdb/api.py
+++ b/src/ralph/cmdb/api.py
@@ -17,7 +17,6 @@
 from ralph.cmdb.monkey import method_check
 import tastypie
 from tastypie.resources import Resource
-Resource.method_check = method_check
 
 from django.conf import settings
 from django.contrib.auth.models import User
@@ -51,6 +50,7 @@
 from ralph.cmdb.models_ci import CIOwner, CIOwnershipType
 from ralph.cmdb.util import breadth_first_search_ci, can_change_ci_state
 
+Resource.method_check = method_check
 
 THROTTLE_AT = settings.API_THROTTLING['throttle_at']
 TIMEFRAME = settings.API_THROTTLING['timeframe']
diff --git a/src/ralph/cmdb/importer.py b/src/ralph/cmdb/importer.py
index 37bd1e403d..fdaf083f93 100644
--- a/src/ralph/cmdb/importer.py
+++ b/src/ralph/cmdb/importer.py
@@ -42,10 +42,8 @@
 from __future__ import unicode_literals
 
 import os
-os.environ['DJANGO_SETTINGS_MODULE'] = "ralph.settings"
 
 import logging
-logger = logging.getLogger(__name__)
 
 from django.contrib.contenttypes.models import ContentType
 
@@ -57,6 +55,10 @@
 from lck.django.common import nested_commit_on_success
 
 
+os.environ['DJANGO_SETTINGS_MODULE'] = "ralph.settings"
+logger = logging.getLogger(__name__)
+
+
 def get_layers_for_ci_type(ci_type_id):
     try:
         ci_type = cdb.CIType.objects.get(pk=ci_type_id)
diff --git a/src/ralph/cmdb/integration/lib/jira.py b/src/ralph/cmdb/integration/lib/jira.py
index 474ec37fcd..a91dfed1e0 100644
--- a/src/ralph/cmdb/integration/lib/jira.py
+++ b/src/ralph/cmdb/integration/lib/jira.py
@@ -6,11 +6,13 @@
 from django.utils import simplejson as json
 
 import logging
-logger = logging.getLogger(__name__)
 
 from ralph.cmdb.integration.exceptions import IssueTrackerException
 
 
+logger = logging.getLogger(__name__)
+
+
 class Jira(object):
 
     def __init__(self):
diff --git a/src/ralph/discovery/models_device.py b/src/ralph/discovery/models_device.py
index 73c824ed26..747265e428 100644
--- a/src/ralph/discovery/models_device.py
+++ b/src/ralph/discovery/models_device.py
@@ -925,6 +925,30 @@ def save(self, sync_fields=True, *args, **kwargs):
         # the reason (for more, see the source code of SavePrioritized).
         return super(Device, self).save(*args, **kwargs)
 
+    def set_property(self, symbol, value, user):
+        from ralph.business.models import RoleProperty, RolePropertyValue
+        try:
+            p = self.venture_role.roleproperty_set.get(symbol=symbol)
+        except RoleProperty.DoesNotExist:
+            p = self.venture.roleproperty_set.get(symbol=symbol)
+        if value != p.default and not {value, p.default} == {None, ''}:
+            pv, created = RolePropertyValue.concurrent_get_or_create(
+                property=p,
+                device=self,
+            )
+            pv.value = value
+            pv.save(user=user)
+        else:
+            try:
+                pv = RolePropertyValue.objects.get(
+                    property=p,
+                    device=self,
+                )
+            except RolePropertyValue.DoesNotExist:
+                pass
+            else:
+                pv.delete()
+
     def get_asset(self):
         asset = None
         if self.id and 'ralph_assets' in settings.INSTALLED_APPS:
diff --git a/src/ralph/discovery/tests/test_models.py b/src/ralph/discovery/tests/test_models.py
index 67ab324a46..b89bfc6be2 100644
--- a/src/ralph/discovery/tests/test_models.py
+++ b/src/ralph/discovery/tests/test_models.py
@@ -19,8 +19,12 @@
 from ralph.discovery.tests.util import DeviceFactory, IPAddressFactory
 from ralph.discovery.models import DeviceType, Device, UptimeSupport
 from ralph.discovery.models_history import HistoryChange
+from ralph.ui.tests.global_utils import UserFactory
 from ralph.util.models import fields_synced_signal, ChangeTuple
-from ralph.util.tests.utils import UserFactory
+from ralph.util.tests.utils import (
+    UserFactory, RolePropertyTypeFactory, RolePropertyFactory,
+    VentureRoleFactory,
+)
 from ralph_assets.models import Orientation
 from ralph_assets.tests.utils.assets import DCAssetFactory, DeviceInfoFactory
 
@@ -184,3 +188,27 @@ def test_orientation_property(self):
         self.assertEqual(dev_2.orientation, 'middle')
         with self.assertRaises(AttributeError):
             dev_2.orientation = Orientation.back.id
+
+
+class DevicePropertiesTest(TestCase):
+
+    def setUp(self):
+        sample_role = VentureRoleFactory()
+        RolePropertyFactory(
+            symbol='my_custom_property_1',
+            type=RolePropertyTypeFactory(symbol='STRING'),
+            role=sample_role,
+        )
+        self.sample_device = DeviceFactory(
+            venture=sample_role.venture, venture_role=sample_role)
+        self.sample_user = UserFactory()
+
+    def test_successful_save(self):
+        self.sample_device.set_property(
+            symbol='my_custom_property_1', value='Test 123',
+            user=self.sample_user,
+        )
+        self.assertEqual(
+            self.sample_device.get_property_set(),
+            {'my_custom_property_1': 'Test 123'}
+        )
diff --git a/src/ralph/ui/views/common.py b/src/ralph/ui/views/common.py
index c91eb9eba1..15997641f5 100644
--- a/src/ralph/ui/views/common.py
+++ b/src/ralph/ui/views/common.py
@@ -55,8 +55,6 @@
 from ralph.scan.models import ScanSummary
 from ralph.scan.util import get_pending_changes, update_scan_summary
 from ralph.business.models import (
-    RoleProperty,
-    RolePropertyValue,
     Venture,
     VentureRole,
 )
@@ -659,27 +657,7 @@ def get(self, *args, **kwargs):
 
     def save_properties(self, device, properties):
         for symbol, value in properties.iteritems():
-            try:
-                p = device.venture_role.roleproperty_set.get(symbol=symbol)
-            except RoleProperty.DoesNotExist:
-                p = device.venture.roleproperty_set.get(symbol=symbol)
-            if value != p.default and not {value, p.default} == {None, ''}:
-                pv, created = RolePropertyValue.concurrent_get_or_create(
-                    property=p,
-                    device=device,
-                )
-                pv.value = value
-                pv.save(user=self.request.user)
-            else:
-                try:
-                    pv = RolePropertyValue.objects.get(
-                        property=p,
-                        device=device,
-                    )
-                except RolePropertyValue.DoesNotExist:
-                    pass
-                else:
-                    pv.delete()
+            device.set_property(symbol, value, self.request.user)
 
     def get_property_form(self, data=None):
         if not self.object.venture_role:
diff --git a/src/ralph/ui/views/racks.py b/src/ralph/ui/views/racks.py
index 97041d9c7e..c75af7cbe1 100644
--- a/src/ralph/ui/views/racks.py
+++ b/src/ralph/ui/views/racks.py
@@ -201,11 +201,15 @@ def sort_tree(self, query, sort):
             depth, item = top.pop()
             c = children[item]
             if sort in ('-position', 'position'):
-                key = lambda x: (x.get_position() or '').rjust(100)
+                def key(x):
+                    return (x.get_position() or '').rjust(100)
                 c.sort(key=key, reverse=not sort.startswith('-'))
             elif sort == '':
-                key = lambda x: (x.model.type if x.model else None,
-                                 (x.get_position() or '').rjust(100))
+                def key(x):
+                    return (
+                        x.model.type if x.model else None,
+                        (x.get_position() or '').rjust(100)
+                    )
                 c.sort(key=key, reverse=True)
             top.extend((depth + 1, i) for i in c)
             item.depth = depth
diff --git a/src/ralph/util/models.py b/src/ralph/util/models.py
index 66d913daf9..9789127a32 100644
--- a/src/ralph/util/models.py
+++ b/src/ralph/util/models.py
@@ -18,6 +18,7 @@
 
 from ralph.settings import SYNC_FIELD_MIXIN_NOTIFICATIONS_WHITELIST
 
+from django.contrib.auth.tests import models as auth_test_models
 ChangeTuple = namedtuple('ChangeTuple', ['field', 'old_value', 'new_value'])
 
 
@@ -34,7 +35,6 @@ def create_api_key_ignore_dberrors(*args, **kwargs):
 
 # workaround for a unit test bug in Django 1.4.x
 
-from django.contrib.auth.tests import models as auth_test_models
 del auth_test_models.ProfileTestCase.test_site_profile_not_available
 
 # signal used by SyncFieldMixin for sending notifications on changed fields
diff --git a/src/ralph/util/tests/utils.py b/src/ralph/util/tests/utils.py
index 85d5f759c5..9a34260a5a 100644
--- a/src/ralph/util/tests/utils.py
+++ b/src/ralph/util/tests/utils.py
@@ -10,7 +10,9 @@
 from factory.django import DjangoModelFactory
 
 from ralph.account.models import Region
-from ralph.business.models import Venture, VentureRole
+from ralph.business.models import (
+    Venture, VentureRole, RolePropertyType, RoleProperty,
+)
 from ralph.cmdb import models_ci
 from ralph.cmdb.tests.utils import CIFactory
 from ralph.ui.tests.global_utils import UserFactory
@@ -95,3 +97,14 @@ class VentureRoleFactory(DjangoModelFactory):
     FACTORY_FOR = VentureRole
     name = factory.Sequence(lambda n: 'Venture role #{}'.format(n))
     venture = factory.SubFactory(VentureFactory)
+
+
+class RolePropertyTypeFactory(DjangoModelFactory):
+    FACTORY_FOR = RolePropertyType
+    symbol = factory.Sequence(lambda n: 'property_type_{}'.format(n))
+
+
+class RolePropertyFactory(DjangoModelFactory):
+    FACTORY_FOR = RoleProperty
+    symbol = factory.Sequence(lambda n: 'property_{}'.format(n))
+    type = factory.SubFactory(RolePropertyTypeFactory)