Fix saving of Benefit/Condition "proxy_class" field in dashboard OfferWizardStepView

- This uses a simpler and more robust way to get the list of fields to
  serialise for storage in the session
- "custom_benefit" and "custom_condition" were unused, as they aren't
  fields of any of the serialised models
- Also remove unused parameter in
  "dashboard.offers.views.OfferWizardStepView._fetch_form_kwargs"

src/oscar/apps/dashboard/offers/views.py

         session_data[self._key()] = json_data
         self.request.session.save()
 
-    def _fetch_form_kwargs(self, step_name=None):
-        if not step_name:
-            step_name = self.step_name
+    def _fetch_form_kwargs(self):
         session_data = self.request.session.setdefault(self.wizard_name, {})
-        json_data = session_data.get(self._key(step_name), None)
+        json_data = session_data.get(self._key(self.step_name), None)
         if json_data:
             return json.loads(json_data)
 
         # We don't store the object instance as that is not JSON serialisable.
         # Instead, we save an alternative form
         instance = form.save(commit=False)
-        fields = form.fields.keys()
-        safe_fields = ['custom_benefit', 'custom_condition']
         # remove fields that do not exist (yet) on the uncommitted instance, i.e. m2m fields
-        # unless they are 'virtual' fields as listed in 'safe_fields'
-        cleanfields = {x: hasattr(instance, x) for x in fields}
-        cleanfields.update({x: True for x in fields if x in safe_fields})
-        cleanfields = [
-            x[0] for x in cleanfields.items() if x[1]
-        ]
+        cleanfields = [field.name for field in instance._meta.local_fields]
 
         json_qs = serializers.serialize('json', [instance], fields=tuple(cleanfields))
 

tests/integration/dashboard/test_offer_views.py

+import json
+
 import pytest
 from django.contrib.messages import get_messages
+from django.test import TestCase
 from django.urls import reverse
+from freezegun import freeze_time
 
 from oscar.apps.dashboard.offers import views as offer_views
 from oscar.apps.dashboard.ranges import views as range_views
+from oscar.apps.offer.custom import create_benefit, create_condition
 from oscar.core.loading import get_model
 from oscar.test.factories.catalogue import ProductFactory
 from oscar.test.factories.offer import ConditionalOfferFactory, RangeFactory
 from oscar.test.factories.voucher import VoucherFactory
+from tests._site.model_tests_app.models import (
+    CustomBenefitModel, CustomConditionModel)
 from tests.fixtures import RequestFactory
 
 Range = get_model('offer', 'Range')
 ConditionalOffer = get_model('offer', 'ConditionalOffer')
+Benefit = get_model('offer', 'Benefit')
+Condition = get_model('offer', 'Condition')
 
 
 @pytest.fixture
         assert response.context_data['paginator']
         assert response.context_data['page_obj']
         assert response.status_code == 200
+
+
+class TestCreateOfferWizardStepView(TestCase):
+
+    def setUp(self):
+        range_ = RangeFactory()
+
+        self.metadata_form_kwargs_session_data = {
+            'data': {
+                'name': 'Test offer',
+                'slug': '',
+                'description': 'Test description',
+                'offer_type': ConditionalOffer.SITE,
+                'exclusive': True,
+                'status': ConditionalOffer.OPEN,
+                'condition': None,
+                'benefit': None,
+                'priority': 0,
+                'start_datetime': None,
+                'end_datetime': None,
+                'max_global_applications': None,
+                'max_user_applications': None,
+                'max_basket_applications': None,
+                'max_discount': None,
+                'total_discount': '0.00',
+                'num_applications': 0,
+                'num_orders': 0,
+                'redirect_url': '',
+                'date_created': None,
+            },
+        }
+        self.metadata_obj_session_data = [{
+            'model': 'offer.conditionaloffer',
+            'pk': None,
+            'fields': {
+                'name': 'Test offer',
+                'description': 'Test description',
+                'offer_type': ConditionalOffer.SITE,
+            },
+        }]
+        self.benefit_form_kwargs_session_data = {
+            'data': {
+                'range': range_.pk,
+                'type': Benefit.PERCENTAGE,
+                'value': '10',
+                'max_affected_items': None,
+                'custom_benefit': '',
+            },
+        }
+        self.benefit_obj_session_data = [{
+            'model': 'offer.benefit',
+            'pk': None,
+            'fields': {
+                'range': range_.pk,
+                'type': Benefit.PERCENTAGE,
+                'value': '10',
+                'max_affected_items': None,
+                'proxy_class': None,
+            },
+        }]
+        self.condition_form_kwargs_session_data = {
+            'data': {
+                'range': range_.pk,
+                'type': Condition.COUNT,
+                'value': '10',
+                'custom_condition': '',
+            },
+        }
+        self.condition_obj_session_data = [{
+            'model': 'offer.condition',
+            'pk': None,
+            'fields': {
+                'range': range_.pk,
+                'type': Condition.COUNT,
+                'value': '10',
+                'proxy_class': None,
+            },
+        }]
+
+    def test_offer_meta_data_view(self):
+        request = RequestFactory().post('/', data={
+            'name': 'Test offer',
+            'description': 'Test description',
+            'offer_type': ConditionalOffer.SITE,
+        })
+        response = offer_views.OfferMetaDataView.as_view()(request)
+
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.url, reverse('dashboard:offer-benefit'))
+        self.assertJSONEqual(request.session['offer_wizard']['metadata'], {
+            'data': {
+                'name': 'Test offer',
+                'description': 'Test description',
+                'offer_type': ConditionalOffer.SITE,
+            },
+        })
+        self.assertJSONEqual(request.session['offer_wizard']['metadata_obj'], [{
+            'model': 'offer.conditionaloffer',
+            'pk': None,
+            'fields': {
+                'name': 'Test offer',
+                'slug': '',
+                'description': 'Test description',
+                'offer_type': ConditionalOffer.SITE,
+                'exclusive': True,
+                'status': ConditionalOffer.OPEN,
+                'condition': None,
+                'benefit': None,
+                'priority': 0,
+                'start_datetime': None,
+                'end_datetime': None,
+                'max_global_applications': None,
+                'max_user_applications': None,
+                'max_basket_applications': None,
+                'max_discount': None,
+                'total_discount': '0.00',
+                'num_applications': 0,
+                'num_orders': 0,
+                'redirect_url': '',
+                'date_created': None,
+            },
+        }])
+
+    def test_offer_benefit_view_with_built_in_benefit_type(self):
+        range_ = RangeFactory()
+
+        request = RequestFactory().post('/', data={
+            'range': range_.pk,
+            'type': Benefit.PERCENTAGE,
+            'value': 10,
+        })
+        request.session['offer_wizard'] = {
+            'metadata': json.dumps(self.metadata_form_kwargs_session_data),
+            'metadata_obj': json.dumps(self.metadata_obj_session_data),
+        }
+        response = offer_views.OfferBenefitView.as_view()(request)
+
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.url, reverse('dashboard:offer-condition'))
+        self.assertJSONEqual(request.session['offer_wizard']['metadata'], self.metadata_form_kwargs_session_data)
+        self.assertJSONEqual(request.session['offer_wizard']['metadata_obj'], self.metadata_obj_session_data)
+        self.assertJSONEqual(request.session['offer_wizard']['benefit'], {
+            'data': {
+                'range': range_.pk,
+                'type': Benefit.PERCENTAGE,
+                'value': '10',
+                'max_affected_items': None,
+                'custom_benefit': '',
+            },
+        })
+        self.assertJSONEqual(request.session['offer_wizard']['benefit_obj'], [{
+            'model': 'offer.benefit',
+            'pk': None,
+            'fields': {
+                'range': range_.pk,
+                'type': Benefit.PERCENTAGE,
+                'value': '10',
+                'max_affected_items': None,
+                'proxy_class': None,
+            },
+        }])
+
+    def test_offer_benefit_view_with_custom_benefit_type(self):
+        benefit = create_benefit(CustomBenefitModel)
+
+        request = RequestFactory().post('/', data={
+            'custom_benefit': benefit.pk,
+        })
+        request.session['offer_wizard'] = {
+            'metadata': json.dumps(self.metadata_form_kwargs_session_data),
+            'metadata_obj': json.dumps(self.metadata_obj_session_data),
+        }
+        response = offer_views.OfferBenefitView.as_view()(request)
+
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.url, reverse('dashboard:offer-condition'))
+        self.assertJSONEqual(request.session['offer_wizard']['metadata'], self.metadata_form_kwargs_session_data)
+        self.assertJSONEqual(request.session['offer_wizard']['metadata_obj'], self.metadata_obj_session_data)
+        self.assertJSONEqual(request.session['offer_wizard']['benefit'], {
+            'data': {
+                'range': None,
+                'type': '',
+                'value': None,
+                'max_affected_items': None,
+                'custom_benefit': str(benefit.pk),
+            },
+        })
+        self.assertJSONEqual(request.session['offer_wizard']['benefit_obj'], [{
+            'model': 'offer.benefit',
+            'pk': benefit.pk,
+            'fields': {
+                'range': None,
+                'type': '',
+                'value': None,
+                'max_affected_items': None,
+                'proxy_class': benefit.proxy_class,
+            }
+        }])
+
+    def test_offer_condition_view_with_built_in_condition_type(self):
+        range_ = RangeFactory()
+
+        request = RequestFactory().post('/', data={
+            'range': range_.pk,
+            'type': Condition.COUNT,
+            'value': 10,
+        })
+        request.session['offer_wizard'] = {
+            'metadata': json.dumps(self.metadata_form_kwargs_session_data),
+            'metadata_obj': json.dumps(self.metadata_obj_session_data),
+            'benefit': json.dumps(self.benefit_form_kwargs_session_data),
+            'benefit_obj': json.dumps(self.benefit_obj_session_data),
+        }
+        response = offer_views.OfferConditionView.as_view()(request)
+
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.url, reverse('dashboard:offer-restrictions'))
+        self.assertJSONEqual(request.session['offer_wizard']['metadata'], self.metadata_form_kwargs_session_data)
+        self.assertJSONEqual(request.session['offer_wizard']['metadata_obj'], self.metadata_obj_session_data)
+        self.assertJSONEqual(request.session['offer_wizard']['benefit'], self.benefit_form_kwargs_session_data)
+        self.assertJSONEqual(request.session['offer_wizard']['benefit_obj'], self.benefit_obj_session_data)
+        self.assertJSONEqual(request.session['offer_wizard']['condition'], {
+            'data': {
+                'range': range_.pk,
+                'type': Condition.COUNT,
+                'value': '10',
+                'custom_condition': '',
+            },
+        })
+        self.assertJSONEqual(request.session['offer_wizard']['condition_obj'], [{
+            'model': 'offer.condition',
+            'pk': None,
+            'fields': {
+                'range': range_.pk,
+                'type': Condition.COUNT,
+                'value': '10',
+                'proxy_class': None,
+            },
+        }])
+
+    def test_offer_condition_view_with_custom_condition_type(self):
+        range_ = RangeFactory()
+        condition = create_condition(CustomConditionModel)
+
+        request = RequestFactory().post('/', data={
+            'range': range_.pk,
+            'custom_condition': condition.pk,
+        })
+        request.session['offer_wizard'] = {
+            'metadata': json.dumps(self.metadata_form_kwargs_session_data),
+            'metadata_obj': json.dumps(self.metadata_obj_session_data),
+            'benefit': json.dumps(self.benefit_form_kwargs_session_data),
+            'benefit_obj': json.dumps(self.benefit_obj_session_data),
+        }
+        response = offer_views.OfferConditionView.as_view()(request)
+
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.url, reverse('dashboard:offer-restrictions'))
+        self.assertJSONEqual(request.session['offer_wizard']['metadata'], self.metadata_form_kwargs_session_data)
+        self.assertJSONEqual(request.session['offer_wizard']['metadata_obj'], self.metadata_obj_session_data)
+        self.assertJSONEqual(request.session['offer_wizard']['benefit'], self.benefit_form_kwargs_session_data)
+        self.assertJSONEqual(request.session['offer_wizard']['benefit_obj'], self.benefit_obj_session_data)
+        self.assertJSONEqual(request.session['offer_wizard']['condition'], {
+            'data': {
+                'range': range_.pk,
+                'type': '',
+                'value': None,
+                'custom_condition': str(condition.pk),
+            },
+        })
+        self.assertJSONEqual(request.session['offer_wizard']['condition_obj'], [{
+            'model': 'offer.condition',
+            'pk': condition.pk,
+            'fields': {
+                'range': None,
+                'type': '',
+                'value': None,
+                'proxy_class': condition.proxy_class,
+            }
+        }])
+
+    def test_offer_restrictions_view(self):
+        request = RequestFactory().post('/', data={
+            'priority': 0,
+        })
+        request.session['offer_wizard'] = {
+            'metadata': json.dumps(self.metadata_form_kwargs_session_data),
+            'metadata_obj': json.dumps(self.metadata_obj_session_data),
+            'benefit': json.dumps(self.benefit_form_kwargs_session_data),
+            'benefit_obj': json.dumps(self.benefit_obj_session_data),
+            'condition': json.dumps(self.condition_form_kwargs_session_data),
+            'condition_obj': json.dumps(self.condition_obj_session_data),
+        }
+        response = offer_views.OfferRestrictionsView.as_view()(request)
+
+        offer = ConditionalOffer.objects.get()
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.url, reverse('dashboard:offer-detail', kwargs={'pk': offer.pk}))
+        self.assertEqual([(m.level_tag, str(m.message)) for m in get_messages(request)][0],
+                         ('success', "Offer '%s' created!" % offer.name))
+        self.assertEqual(request.session['offer_wizard'], {})
+
+
+@freeze_time('2021-04-23 14:00:00')
+class TestUpdateOfferWizardStepView(TestCase):
+
+    def setUp(self):
+        self.offer = ConditionalOfferFactory()
+        self.metadata_form_kwargs_key = 'metadata%s' % self.offer.pk
+        self.metadata_obj_key = 'metadata%s_obj' % self.offer.pk
+        self.benefit_form_kwargs_key = 'benefit%s' % self.offer.pk
+        self.benefit_obj_key = 'benefit%s_obj' % self.offer.pk
+        self.condition_form_kwargs_key = 'condition%s' % self.offer.pk
+        self.condition_obj_key = 'condition%s_obj' % self.offer.pk
+        range_ = RangeFactory()
+
+        self.metadata_form_kwargs_session_data = {
+            'data': {
+                'name': 'Test offer',
+                'slug': self.offer.slug,
+                'description': 'Test description',
+                'offer_type': ConditionalOffer.VOUCHER,
+                'exclusive': True,
+                'status': ConditionalOffer.OPEN,
+                'condition': self.offer.condition.pk,
+                'benefit': self.offer.benefit.pk,
+                'priority': 0,
+                'start_datetime': None,
+                'end_datetime': None,
+                'max_global_applications': None,
+                'max_user_applications': None,
+                'max_basket_applications': None,
+                'max_discount': None,
+                'total_discount': '0.00',
+                'num_applications': 0,
+                'num_orders': 0,
+                'redirect_url': '',
+                'date_created': '2021-04-23T14:00:00Z',
+            },
+        }
+        self.metadata_obj_session_data = [{
+            'model': 'offer.conditionaloffer',
+            'pk': None,
+            'fields': {
+                'name': 'Test offer',
+                'description': 'Test description',
+                'offer_type': ConditionalOffer.VOUCHER,
+            },
+        }]
+        self.benefit_form_kwargs_session_data = {
+            'data': {
+                'range': range_.pk,
+                'type': Benefit.FIXED,
+                'value': '2000',
+                'max_affected_items': 2,
+                'custom_benefit': '',
+            },
+        }
+        self.benefit_obj_session_data = [{
+            'model': 'offer.benefit',
+            'pk': None,
+            'fields': {
+                'range': range_.pk,
+                'type': Benefit.FIXED,
+                'value': '2000',
+                'max_affected_items': 2,
+                'proxy_class': '',
+            },
+        }]
+        self.condition_form_kwargs_session_data = {
+            'data': {
+                'range': range_.pk,
+                'type': Condition.VALUE,
+                'value': '2000',
+                'custom_condition': '',
+            },
+        }
+        self.condition_obj_session_data = [{
+            'model': 'offer.condition',
+            'pk': None,
+            'fields': {
+                'range': range_.pk,
+                'type': Condition.VALUE,
+                'value': '2000',
+                'proxy_class': '',
+            },
+        }]
+
+    def test_offer_meta_data_view(self):
+        request = RequestFactory().post('/', data={
+            'name': 'Test offer',
+            'description': 'Test description',
+            'offer_type': ConditionalOffer.VOUCHER,
+        })
+        response = offer_views.OfferMetaDataView.as_view(update=True)(request, pk=self.offer.pk)
+
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.url, reverse('dashboard:offer-benefit', kwargs={'pk': self.offer.pk}))
+        self.assertJSONEqual(request.session['offer_wizard'][self.metadata_form_kwargs_key], {
+            'data': {
+                'name': 'Test offer',
+                'description': 'Test description',
+                'offer_type': ConditionalOffer.VOUCHER,
+            },
+        })
+        self.assertJSONEqual(request.session['offer_wizard'][self.metadata_obj_key], [{
+            'model': 'offer.conditionaloffer',
+            'pk': self.offer.pk,
+            'fields': {
+                'name': 'Test offer',
+                'slug': self.offer.slug,
+                'description': 'Test description',
+                'offer_type': ConditionalOffer.VOUCHER,
+                'exclusive': True,
+                'status': ConditionalOffer.OPEN,
+                'condition': self.offer.condition.pk,
+                'benefit': self.offer.benefit.pk,
+                'priority': 0,
+                'start_datetime': None,
+                'end_datetime': None,
+                'max_global_applications': None,
+                'max_user_applications': None,
+                'max_basket_applications': None,
+                'max_discount': None,
+                'total_discount': '0.00',
+                'num_applications': 0,
+                'num_orders': 0,
+                'redirect_url': '',
+                'date_created': '2021-04-23T14:00:00Z',
+            },
+        }])
+
+    def test_offer_benefit_view_with_built_in_benefit_type(self):
+        range_ = RangeFactory()
+
+        request = RequestFactory().post('/', data={
+            'range': range_.pk,
+            'type': Benefit.FIXED,
+            'value': 2000,
+        })
+        request.session['offer_wizard'] = {
+            self.metadata_form_kwargs_key: json.dumps(self.metadata_form_kwargs_session_data),
+            self.metadata_obj_key: json.dumps(self.metadata_obj_session_data),
+        }
+        response = offer_views.OfferBenefitView.as_view(update=True)(request, pk=self.offer.pk)
+
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.url, reverse('dashboard:offer-condition', kwargs={'pk': self.offer.pk}))
+        self.assertJSONEqual(request.session['offer_wizard'][self.metadata_form_kwargs_key],
+                             self.metadata_form_kwargs_session_data)
+        self.assertJSONEqual(request.session['offer_wizard'][self.metadata_obj_key], self.metadata_obj_session_data)
+        self.assertJSONEqual(request.session['offer_wizard'][self.benefit_form_kwargs_key], {
+            'data': {
+                'range': range_.pk,
+                'type': Benefit.FIXED,
+                'value': '2000',
+                'max_affected_items': None,
+                'custom_benefit': '',
+            },
+        })
+        self.assertJSONEqual(request.session['offer_wizard'][self.benefit_obj_key], [{
+            'model': 'offer.benefit',
+            'pk': self.offer.benefit.pk,
+            'fields': {
+                'range': range_.pk,
+                'type': Benefit.FIXED,
+                'value': '2000',
+                'max_affected_items': None,
+                'proxy_class': '',
+            },
+        }])
+
+    def test_offer_benefit_view_with_custom_benefit_type(self):
+        benefit = create_benefit(CustomBenefitModel)
+
+        request = RequestFactory().post('/', data={
+            'custom_benefit': benefit.pk,
+        })
+        request.session['offer_wizard'] = {
+            self.metadata_form_kwargs_key: json.dumps(self.metadata_form_kwargs_session_data),
+            self.metadata_obj_key: json.dumps(self.metadata_obj_session_data),
+        }
+        response = offer_views.OfferBenefitView.as_view(update=True)(request, pk=self.offer.pk)
+
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.url, reverse('dashboard:offer-condition', kwargs={'pk': self.offer.pk}))
+        self.assertJSONEqual(request.session['offer_wizard'][self.metadata_form_kwargs_key],
+                             self.metadata_form_kwargs_session_data)
+        self.assertJSONEqual(request.session['offer_wizard'][self.metadata_obj_key], self.metadata_obj_session_data)
+        self.assertJSONEqual(request.session['offer_wizard'][self.benefit_form_kwargs_key], {
+            'data': {
+                'range': None,
+                'type': '',
+                'value': None,
+                'max_affected_items': None,
+                'custom_benefit': str(benefit.pk),
+            },
+        })
+        self.assertJSONEqual(request.session['offer_wizard'][self.benefit_obj_key], [{
+            'model': 'offer.benefit',
+            'pk': benefit.pk,
+            'fields': {
+                'range': None,
+                'type': '',
+                'value': None,
+                'max_affected_items': None,
+                'proxy_class': benefit.proxy_class,
+            }
+        }])
+
+    def test_offer_condition_view_with_built_in_condition_type(self):
+        range_ = RangeFactory()
+
+        request = RequestFactory().post('/', data={
+            'range': range_.pk,
+            'type': Condition.VALUE,
+            'value': 2000,
+        })
+        request.session['offer_wizard'] = {
+            self.metadata_form_kwargs_key: json.dumps(self.metadata_form_kwargs_session_data),
+            self.metadata_obj_key: json.dumps(self.metadata_obj_session_data),
+            self.benefit_form_kwargs_key: json.dumps(self.benefit_form_kwargs_session_data),
+            self.benefit_obj_key: json.dumps(self.benefit_obj_session_data),
+        }
+        response = offer_views.OfferConditionView.as_view(update=True)(request, pk=self.offer.pk)
+
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.url, reverse('dashboard:offer-restrictions', kwargs={'pk': self.offer.pk}))
+        self.assertJSONEqual(request.session['offer_wizard'][self.metadata_form_kwargs_key],
+                             self.metadata_form_kwargs_session_data)
+        self.assertJSONEqual(request.session['offer_wizard'][self.metadata_obj_key], self.metadata_obj_session_data)
+        self.assertJSONEqual(request.session['offer_wizard'][self.benefit_form_kwargs_key],
+                             self.benefit_form_kwargs_session_data)
+        self.assertJSONEqual(request.session['offer_wizard'][self.benefit_obj_key], self.benefit_obj_session_data)
+        self.assertJSONEqual(request.session['offer_wizard'][self.condition_form_kwargs_key], {
+            'data': {
+                'range': range_.pk,
+                'type': Condition.VALUE,
+                'value': '2000',
+                'custom_condition': '',
+            },
+        })
+        self.assertJSONEqual(request.session['offer_wizard'][self.condition_obj_key], [{
+            'model': 'offer.condition',
+            'pk': self.offer.condition.pk,
+            'fields': {
+                'range': range_.pk,
+                'type': Condition.VALUE,
+                'value': '2000',
+                'proxy_class': '',
+            },
+        }])
+
+    def test_offer_condition_view_with_custom_condition_type(self):
+        range_ = RangeFactory()
+        condition = create_condition(CustomConditionModel)
+
+        request = RequestFactory().post('/', data={
+            'range': range_.pk,
+            'custom_condition': condition.pk,
+        })
+        request.session['offer_wizard'] = {
+            self.metadata_form_kwargs_key: json.dumps(self.metadata_form_kwargs_session_data),
+            self.metadata_obj_key: json.dumps(self.metadata_obj_session_data),
+            self.benefit_form_kwargs_key: json.dumps(self.benefit_form_kwargs_session_data),
+            self.benefit_obj_key: json.dumps(self.benefit_obj_session_data),
+        }
+        response = offer_views.OfferConditionView.as_view(update=True)(request, pk=self.offer.pk)
+
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.url, reverse('dashboard:offer-restrictions', kwargs={'pk': self.offer.pk}))
+        self.assertJSONEqual(request.session['offer_wizard'][self.metadata_form_kwargs_key],
+                             self.metadata_form_kwargs_session_data)
+        self.assertJSONEqual(request.session['offer_wizard'][self.metadata_obj_key], self.metadata_obj_session_data)
+        self.assertJSONEqual(request.session['offer_wizard'][self.benefit_form_kwargs_key],
+                             self.benefit_form_kwargs_session_data)
+        self.assertJSONEqual(request.session['offer_wizard'][self.benefit_obj_key], self.benefit_obj_session_data)
+        self.assertJSONEqual(request.session['offer_wizard'][self.condition_form_kwargs_key], {
+            'data': {
+                'range': range_.pk,
+                'type': '',
+                'value': None,
+                'custom_condition': str(condition.pk),
+            },
+        })
+        self.assertJSONEqual(request.session['offer_wizard'][self.condition_obj_key], [{
+            'model': 'offer.condition',
+            'pk': condition.pk,
+            'fields': {
+                'range': None,
+                'type': '',
+                'value': None,
+                'proxy_class': condition.proxy_class,
+            }
+        }])
+
+    def test_offer_restrictions_view(self):
+        request = RequestFactory().post('/', data={
+            'priority': 0,
+        })
+        request.session['offer_wizard'] = {
+            self.metadata_form_kwargs_key: json.dumps(self.metadata_form_kwargs_session_data),
+            self.metadata_obj_key: json.dumps(self.metadata_obj_session_data),
+            self.benefit_form_kwargs_key: json.dumps(self.benefit_form_kwargs_session_data),
+            self.benefit_obj_key: json.dumps(self.benefit_obj_session_data),
+            self.condition_form_kwargs_key: json.dumps(self.condition_form_kwargs_session_data),
+            self.condition_obj_key: json.dumps(self.condition_obj_session_data),
+        }
+        response = offer_views.OfferRestrictionsView.as_view(update=True)(request, pk=self.offer.pk)
+
+        self.offer.refresh_from_db()
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.url, reverse('dashboard:offer-detail', kwargs={'pk': self.offer.pk}))
+        self.assertEqual([(m.level_tag, str(m.message)) for m in get_messages(request)][0],
+                         ('success', "Offer '%s' updated" % self.offer.name))
+        self.assertEqual(request.session['offer_wizard'], {})