Merge pull request #1357 from edx/jbau/shoppingcart-user-middleware

Jbau/shoppingcart user middleware

lms/djangoapps/shoppingcart/context_processor.py

+"""
+This is the shoppingcart context_processor module.
+Currently the only context_processor detects whether request.user has a cart that should be displayed in the
+navigation.  We want to do this in the context_processor to
+1) keep database accesses out of templates (this led to a transaction bug with user email changes)
+2) because navigation.html is "called" by being included in other templates, there's no "views.py" to put this.
+"""
+from django.conf import settings
+import shoppingcart
+
+
+def user_has_cart_context_processor(request):
+    """
+    Checks if request has an authenticated user.  If so, checks if request.user has a cart that should
+    be displayed.  Anonymous users don't.
+    Adds `display_shopping_cart` to the context
+    """
+    return {'display_shopping_cart': (
+        request.user.is_authenticated() and                                # user is logged in and
+        settings.MITX_FEATURES.get('ENABLE_PAID_COURSE_REGISTRATION') and  # settings enable paid course reg and
+        settings.MITX_FEATURES.get('ENABLE_SHOPPING_CART') and             # settings enable shopping cart and
+        shoppingcart.models.Order.user_cart_has_items(request.user)        # user's cart has items
+    )}

lms/djangoapps/shoppingcart/tests/test_context_processor.py

+"""
+Unit tests for shoppingcart context_processor
+"""
+from mock import patch, Mock
+from django.conf import settings
+from django.contrib.auth.models import AnonymousUser
+from django.test.utils import override_settings
+
+from courseware.tests.tests import TEST_DATA_MONGO_MODULESTORE
+from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
+from xmodule.modulestore.tests.factories import CourseFactory
+from student.tests.factories import UserFactory
+from course_modes.tests.factories import CourseModeFactory
+from shoppingcart.models import Order, PaidCourseRegistration
+from shoppingcart.context_processor import user_has_cart_context_processor
+
+
+@override_settings(MODULESTORE=TEST_DATA_MONGO_MODULESTORE)
+class UserCartContextProcessorUnitTest(ModuleStoreTestCase):
+    """
+    Unit test for shoppingcart context_processor
+    """
+    def setUp(self):
+        self.user = UserFactory.create()
+        self.request = Mock()
+
+    def add_to_cart(self):
+        """
+        Adds content to self.user's cart
+        """
+        course = CourseFactory.create(org='MITx', number='999', display_name='Robot Super Course')
+        CourseModeFactory(course_id=course.id)
+        cart = Order.get_cart_for_user(self.user)
+        PaidCourseRegistration.add_to_order(cart, course.id)
+
+    @patch.dict(settings.MITX_FEATURES, {'ENABLE_SHOPPING_CART': False, 'ENABLE_PAID_COURSE_REGISTRATION': True})
+    def test_no_enable_shoppingcart(self):
+        """
+        Tests when MITX_FEATURES['ENABLE_SHOPPING_CART'] is not set
+        """
+        self.add_to_cart()
+        self.request.user = self.user
+        context = user_has_cart_context_processor(self.request)
+        self.assertFalse(context['display_shopping_cart'])
+
+    @patch.dict(settings.MITX_FEATURES, {'ENABLE_SHOPPING_CART': True, 'ENABLE_PAID_COURSE_REGISTRATION': False})
+    def test_no_enable_paid_course_registration(self):
+        """
+        Tests when MITX_FEATURES['ENABLE_PAID_COURSE_REGISTRATION'] is not set
+        """
+        self.add_to_cart()
+        self.request.user = self.user
+        context = user_has_cart_context_processor(self.request)
+        self.assertFalse(context['display_shopping_cart'])
+
+    @patch.dict(settings.MITX_FEATURES, {'ENABLE_SHOPPING_CART': True, 'ENABLE_PAID_COURSE_REGISTRATION': True})
+    def test_anonymous_user(self):
+        """
+        Tests when request.user is anonymous
+        """
+        self.request.user = AnonymousUser()
+        context = user_has_cart_context_processor(self.request)
+        self.assertFalse(context['display_shopping_cart'])
+
+    @patch.dict(settings.MITX_FEATURES, {'ENABLE_SHOPPING_CART': True, 'ENABLE_PAID_COURSE_REGISTRATION': True})
+    def test_no_items_in_cart(self):
+        """
+        Tests when request.user doesn't have a cart with items
+        """
+        self.request.user = self.user
+        context = user_has_cart_context_processor(self.request)
+        self.assertFalse(context['display_shopping_cart'])
+
+    @patch.dict(settings.MITX_FEATURES, {'ENABLE_SHOPPING_CART': True, 'ENABLE_PAID_COURSE_REGISTRATION': True})
+    def test_items_in_cart(self):
+        """
+        Tests when request.user has a cart with items
+        """
+        self.add_to_cart()
+        self.request.user = self.user
+        context = user_has_cart_context_processor(self.request)
+        self.assertTrue(context['display_shopping_cart'])

lms/envs/common.py

@@ -272,6 +272,9 @@ TEMPLATE_CONTEXT_PROCESSORS = (
 
     # Hack to get required link URLs to password reset templates
     'mitxmako.shortcuts.marketing_link_context_processor',
+
+    # Shoppingcart processor (detects if request.user has a cart)
+    'shoppingcart.context_processor.user_has_cart_context_processor',
 )
 
 # use the ratelimit backend to prevent brute force attacks

lms/templates/navigation.html

@@ -9,8 +9,6 @@ from django.utils.translation import ugettext as _
 import branding
 # app that handles site status messages
 from status.status import get_site_status_msg
-# shopping cart
-import shoppingcart
 %>
 
 ## Provide a hook for themes to inject branding on top.
@@ -83,9 +81,7 @@ site_status_msg = get_site_status_msg(course_id)
         </ul>
       </li>
     </ol>
-      % if settings.MITX_FEATURES.get('ENABLE_PAID_COURSE_REGISTRATION') and \
-           settings.MITX_FEATURES.get('ENABLE_SHOPPING_CART') and \
-           shoppingcart.models.Order.user_cart_has_items(user):
+      % if display_shopping_cart: # see shoppingcart.context_processor.user_has_cart_context_processor
         <ol class="user">
           <li class="primary">
             <a class="shopping-cart" href="${reverse('shoppingcart.views.show_cart')}">