Course info page no longer creates enrollments.

The course info page was getting-or-creating
a course enrollment with is_active=0.  This commit
changes the operation to a "get" so that extra
enrollment records are not created.

lms/djangoapps/courseware/tests/test_course_info.py

@@ -9,6 +9,7 @@ from opaque_keys.edx.locations import SlashSeparatedCourseKey
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
 from xmodule.modulestore.tests.django_utils import TEST_DATA_MIXED_CLOSED_MODULESTORE
 from xmodule.modulestore.tests.factories import CourseFactory, ItemFactory
+from student.models import CourseEnrollment
 
 from .helpers import LoginEnrollmentTestCase
 
@@ -45,6 +46,20 @@ class CourseInfoTestCase(LoginEnrollmentTestCase, ModuleStoreTestCase):
         self.assertEqual(resp.status_code, 200)
         self.assertNotIn("OOGIE BLOOGIE", resp.content)
 
+    def test_logged_in_not_enrolled(self):
+        self.setup_user()
+        url = reverse('info', args=[self.course.id.to_deprecated_string()])
+        self.client.get(url)
+
+        # Check whether the user has been enrolled in the course.
+        # There was a bug in which users would be automatically enrolled
+        # with is_active=False (same as if they enrolled and immediately unenrolled).
+        # This verifies that the user doesn't have *any* enrollment record.
+        enrollment_exists = CourseEnrollment.objects.filter(
+            user=self.user, course_id=self.course.id
+        ).exists()
+        self.assertFalse(enrollment_exists)
+
 
 class CourseInfoTestCaseXML(LoginEnrollmentTestCase, ModuleStoreTestCase):
     """

lms/djangoapps/courseware/views.py

@@ -665,7 +665,6 @@ def course_info(request, course_id):
 
     Assumes the course_id is in a valid format.
     """
-
     course_key = SlashSeparatedCourseKey.from_deprecated_string(course_id)
 
     with modulestore().bulk_operations(course_key):
@@ -1078,7 +1077,8 @@ def fetch_reverify_banner_info(request, course_key):
     user = request.user
     if not user.id:
         return reverifications
-    enrollment = CourseEnrollment.get_or_create_enrollment(request.user, course_key)
+    enrollment = CourseEnrollment.get_enrollment(request.user, course_key)
+    if enrollment is not None:
         course = modulestore().get_course(course_key)
         info = single_course_reverification_info(user, course, enrollment)
         if info: