fix enrollment issue in instructor dash (ECOM-776)

lms/djangoapps/instructor/enrollment.py

@@ -35,7 +35,7 @@ class EmailEnrollmentState(object):
             exists_ce = False
             full_name = None
         ceas = CourseEnrollmentAllowed.objects.filter(course_id=course_id, email=email).all()
-        exists_allowed = len(ceas) > 0
+        exists_allowed = ceas.exists()
         state_auto_enroll = exists_allowed and ceas[0].auto_enroll
 
         self.user = exists_user
@@ -88,7 +88,13 @@ def enroll_email(course_id, student_email, auto_enroll=False, email_students=Fal
     previous_state = EmailEnrollmentState(course_id, student_email)
 
     if previous_state.user:
-        CourseEnrollment.enroll_by_email(student_email, course_id, previous_state.mode)
+        # if the student is currently unenrolled, don't enroll them in their
+        # previous mode
+        course_mode = u"honor"
+        if previous_state.enrollment:
+            course_mode = previous_state.mode
+
+        CourseEnrollment.enroll_by_email(student_email, course_id, course_mode)
         if email_students:
             email_params['message'] = 'enrolled_enroll'
             email_params['email_address'] = student_email

lms/djangoapps/instructor/tests/test_api.py

@@ -1077,23 +1077,53 @@ class TestInstructorAPIEnrollment(ModuleStoreTestCase, LoginEnrollmentTestCase):
         self.assertEqual(course_enrollment.mode, u'verified')
 
         # now re-enroll the student through the instructor dash
+        self._change_student_enrollment(self.enrolled_student, self.course, 'enroll')
+
+        # affirm that the student is still in "verified" mode
+        course_enrollment = CourseEnrollment.objects.get(
+            user=self.enrolled_student, course_id=self.course.id
+        )
+        self.assertEqual(course_enrollment.mode, u"verified")
+
+    def test_unenroll_and_enroll_verified(self):
+        """
+        Test that unenrolling and enrolling a student from a verified track
+        results in that student being in an honor track
+        """
+        course_enrollment = CourseEnrollment.objects.get(
+            user=self.enrolled_student, course_id=self.course.id
+        )
+        # upgrade enrollment
+        course_enrollment.mode = u'verified'
+        course_enrollment.save()
+        self.assertEqual(course_enrollment.mode, u'verified')
+
+        self._change_student_enrollment(self.enrolled_student, self.course, 'unenroll')
+
+        self._change_student_enrollment(self.enrolled_student, self.course, 'enroll')
+
+        course_enrollment = CourseEnrollment.objects.get(
+            user=self.enrolled_student, course_id=self.course.id
+        )
+        self.assertEqual(course_enrollment.mode, u'honor')
+
+    def _change_student_enrollment(self, user, course, action):
+        """
+        Helper function that posts to 'students_update_enrollment' to change
+        a student's enrollment
+        """
         url = reverse(
             'students_update_enrollment',
-            kwargs={'course_id': self.course.id.to_deprecated_string()},
+            kwargs={'course_id': course.id.to_deprecated_string()},
         )
         params = {
-            'identifiers': self.enrolled_student.email,
-            'action': 'enroll',
+            'identifiers': user.email,
+            'action': action,
             'email_students': True,
         }
         response = self.client.post(url, params)
         self.assertEqual(response.status_code, 200)
-
-        # affirm that the student is still in "verified" mode
-        course_enrollment = CourseEnrollment.objects.get(
-            user=self.enrolled_student, course_id=self.course.id
-        )
-        self.assertEqual(course_enrollment.mode, u"verified")
+        return response
 
 
 @ddt.ddt