Bump django to the latest version

12 files changed, 104 insertions, 115 deletions

diff --git a/grades/models.py b/grades/models.py
index b395a24..656c0d1 100644
--- a/grades/models.py
+++ b/grades/models.py
@@ -5,7 +5,8 @@ from django.contrib.auth.models import User
 class GradingSystem(models.Model):
     name = models.CharField(max_length=255, unique=True)
     description = models.TextField(default='About the grading system!')
-    creator = models.ForeignKey(User, null=True, blank=True)
+    creator = models.ForeignKey(User, null=True, blank=True,
+                                on_delete=models.CASCADE)
 
     def get_grade(self, marks):
         ranges = self.graderange_set.all()
@@ -39,7 +40,7 @@ class GradingSystem(models.Model):
 
 
 class GradeRange(models.Model):
-    system = models.ForeignKey(GradingSystem)
+    system = models.ForeignKey(GradingSystem, on_delete=models.CASCADE)
     lower_limit = models.FloatField()
     upper_limit = models.FloatField()
     grade = models.CharField(max_length=10)
diff --git a/online_test/settings.py b/online_test/settings.py
index 7129e83..7b0e2d4 100644
--- a/online_test/settings.py
+++ b/online_test/settings.py
@@ -47,7 +47,7 @@ INSTALLED_APPS = (
     'grades',
 )
 
-MIDDLEWARE_CLASSES = (
+MIDDLEWARE = (
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
diff --git a/online_test/urls.py b/online_test/urls.py
index 18ebc54..52cbd40 100644
--- a/online_test/urls.py
+++ b/online_test/urls.py
@@ -10,12 +10,11 @@ urlpatterns = [
     # url(r'^$', 'online_test.views.home', name='home'),
     # url(r'^blog/', include('blog.urls')),
 
-    url(r'^admin/', include(admin.site.urls)),
+    url(r'^admin/', admin.site.urls),
     url(r'^$', views.index, name='index'),
-    url(r'^exam/', include('yaksh.urls', namespace='yaksh', app_name='yaksh')),
-    url(r'^exam/reset/', include('yaksh.urls_password_reset')),
+    url(r'^exam/', include(('yaksh.urls', 'yaksh'))),
+    url(r'^exam/reset/', include('django.contrib.auth.urls')),
     url(r'^', include('social_django.urls', namespace='social')),
-    url(r'^grades/', include('grades.urls', namespace='grades',
-                             app_name='grades')),
+    url(r'^grades/', include(('grades.urls', 'grades'))),
 ]
 urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
diff --git a/requirements/requirements-common.txt b/requirements/requirements-common.txt
index 54e4c84..d1fed93 100644
--- a/requirements/requirements-common.txt
+++ b/requirements/requirements-common.txt
@@ -1,8 +1,8 @@
 -r requirements-codeserver.txt
 invoke==0.21.0
-django==1.11.21
-django-taggit==0.18.1
-pytz==2016.4
+django==3.0.3
+django-taggit==1.2.0
+pytz==2019.3
 requests-oauthlib>=0.6.1
 social-auth-app-django==3.1.0
 selenium==2.53.6
diff --git a/setup.py b/setup.py
index d389584..1681654 100644
--- a/setup.py
+++ b/setup.py
@@ -16,9 +16,9 @@ def get_version():
 
 
 install_requires = [
-    'django==1.11.21',
-    'django-taggit==0.18.1',
-    'pytz==2016.4',
+    'django==3.0.3',
+    'django-taggit==1.2.0',
+    'pytz==2019.3',
     'requests-oauthlib>=0.6.1',
     'python-social-auth==0.2.19',
     'tornado',
diff --git a/yaksh/middleware/one_session_per_user.py b/yaksh/middleware/one_session_per_user.py
index 1ed1786..3b8d302 100644
--- a/yaksh/middleware/one_session_per_user.py
+++ b/yaksh/middleware/one_session_per_user.py
@@ -20,6 +20,13 @@ class OneSessionPerUserMiddleware(object):
           Link: https://docs.djangoproject.com/en/1.5/topics/auth/customizing/
           #extending-the-existing-user-model
     """
+
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        return self.get_response(request)
+
     def process_request(self, request):
         """
             # Documentation:
diff --git a/yaksh/middleware/user_time_zone.py b/yaksh/middleware/user_time_zone.py
index 206c08a..92035e8 100644
--- a/yaksh/middleware/user_time_zone.py
+++ b/yaksh/middleware/user_time_zone.py
@@ -8,6 +8,12 @@ class TimezoneMiddleware(object):
         if user timezone is not available default value 'Asia/Kolkata'
         is activated
     """
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        return self.get_response(request)
+
     def process_request(self, request):
         user = request.user
         user_tz = 'Asia/Kolkata'
diff --git a/yaksh/models.py b/yaksh/models.py
index 3894165..2ebfa38 100644
--- a/yaksh/models.py
+++ b/yaksh/models.py
@@ -258,7 +258,7 @@ class Lesson(models.Model):
     html_data = models.TextField(null=True, blank=True)
 
     # Creator of the lesson
-    creator = models.ForeignKey(User)
+    creator = models.ForeignKey(User, on_delete=models.CASCADE)
 
     # Activate/Deactivate Lesson
     active = models.BooleanField(default=True)
@@ -329,7 +329,8 @@ class Lesson(models.Model):
 
 #############################################################################
 class LessonFile(models.Model):
-    lesson = models.ForeignKey(Lesson, related_name="lesson")
+    lesson = models.ForeignKey(Lesson, related_name="lesson",
+                               on_delete=models.CASCADE)
     file = models.FileField(upload_to=get_file_dir, default=None)
 
     def remove(self):
@@ -477,7 +478,7 @@ class Quiz(models.Model):
 
     is_exercise = models.BooleanField(default=False)
 
-    creator = models.ForeignKey(User, null=True)
+    creator = models.ForeignKey(User, null=True, on_delete=models.CASCADE)
 
     objects = QuizManager()
 
@@ -534,7 +535,7 @@ class Quiz(models.Model):
         except QuestionPaper.DoesNotExist:
             qp = None
         ans_ppr = AnswerPaper.objects.filter(
-            user=user, course=course, question_paper=qp
+            user_id=user.id, course_id=course.id, question_paper_id=qp
         ).order_by("-attempt_number")
         if ans_ppr.exists():
             status = ans_ppr.first().status
@@ -548,7 +549,7 @@ class Quiz(models.Model):
         except QuestionPaper.DoesNotExist:
             qp = None
         ans_ppr = AnswerPaper.objects.filter(
-            user=user, course=course, question_paper=qp
+            user_id=user.id, course_id=course.id, question_paper_id=qp
         ).order_by("-attempt_number")
         if ans_ppr.exists():
             return any([paper.passed for paper in ans_ppr])
@@ -593,8 +594,10 @@ class LearningUnit(models.Model):
     """ Maintain order of lesson and quiz added in the course """
     order = models.IntegerField()
     type = models.CharField(max_length=16)
-    lesson = models.ForeignKey(Lesson, null=True, blank=True)
-    quiz = models.ForeignKey(Quiz, null=True, blank=True)
+    lesson = models.ForeignKey(Lesson, null=True, blank=True,
+                               on_delete=models.CASCADE)
+    quiz = models.ForeignKey(Quiz, null=True, blank=True,
+                             on_delete=models.CASCADE)
     check_prerequisite = models.BooleanField(default=True)
 
     def get_lesson_or_quiz(self):
@@ -607,10 +610,12 @@ class LearningUnit(models.Model):
             self.check_prerequisite = True
 
     def get_completion_status(self, user, course):
-        course_status = CourseStatus.objects.filter(user=user, course=course)
+        course_status = CourseStatus.objects.filter(
+            user_id=user.id, course_id=course.id
+        )
         state = "not attempted"
         if course_status.exists():
-            if self in course_status.first().completed_units.all():
+            if course_status.first().completed_units.filter(id=self.id):
                 state = "completed"
             elif self.type == "quiz":
                 state = self.quiz.get_answerpaper_status(user, course)
@@ -657,7 +662,8 @@ class LearningModule(models.Model):
     name = models.CharField(max_length=255)
     description = models.TextField(default=None, null=True, blank=True)
     order = models.IntegerField(default=0)
-    creator = models.ForeignKey(User, related_name="module_creator")
+    creator = models.ForeignKey(User, related_name="module_creator",
+                                on_delete=models.CASCADE)
     check_prerequisite = models.BooleanField(default=True)
     check_prerequisite_passes = models.BooleanField(default=False)
     html_data = models.TextField(null=True, blank=True)
@@ -834,7 +840,8 @@ class Course(models.Model):
     active = models.BooleanField(default=True)
     code = models.CharField(max_length=128, null=True, blank=True)
     hidden = models.BooleanField(default=False)
-    creator = models.ForeignKey(User, related_name='creator')
+    creator = models.ForeignKey(User, related_name='creator',
+                                on_delete=models.CASCADE)
     students = models.ManyToManyField(User, related_name='students')
     requests = models.ManyToManyField(User, related_name='requests')
     rejected = models.ManyToManyField(User, related_name='rejected')
@@ -863,7 +870,8 @@ class Course(models.Model):
         null=True
     )
 
-    grading_system = models.ForeignKey(GradingSystem, null=True, blank=True)
+    grading_system = models.ForeignKey(GradingSystem, null=True, blank=True,
+                                       on_delete=models.CASCADE)
 
     objects = CourseManager()
 
@@ -1117,9 +1125,10 @@ class CourseStatus(models.Model):
     completed_units = models.ManyToManyField(LearningUnit,
                                              related_name="completed_units")
     current_unit = models.ForeignKey(LearningUnit, related_name="current_unit",
-                                     null=True, blank=True)
-    course = models.ForeignKey(Course)
-    user = models.ForeignKey(User)
+                                     null=True, blank=True,
+                                     on_delete=models.CASCADE)
+    course = models.ForeignKey(Course, on_delete=models.CASCADE)
+    user = models.ForeignKey(User, on_delete=models.CASCADE)
     grade = models.CharField(max_length=255, null=True, blank=True)
     percentage = models.FloatField(default=0.0)
     percent_completed = models.IntegerField(default=0)
@@ -1131,7 +1140,7 @@ class CourseStatus(models.Model):
         if self.is_course_complete():
             self.calculate_percentage()
             if self.course.grading_system is None:
-                grading_system = GradingSystem.objects.get(name='default')
+                grading_system = GradingSystem.objects.get(name__contains='default')
             else:
                 grading_system = self.course.grading_system
             grade = grading_system.get_grade(self.percentage)
@@ -1173,14 +1182,14 @@ class CourseStatus(models.Model):
 
 ###############################################################################
 class ConcurrentUser(models.Model):
-    concurrent_user = models.OneToOneField(User)
+    concurrent_user = models.OneToOneField(User, on_delete=models.CASCADE)
     session_key = models.CharField(max_length=40)
 
 
 ###############################################################################
 class Profile(models.Model):
     """Profile for a user to store roll number and other details."""
-    user = models.OneToOneField(User)
+    user = models.OneToOneField(User, on_delete=models.CASCADE)
     roll_number = models.CharField(max_length=20)
     institute = models.CharField(max_length=128)
     department = models.CharField(max_length=64)
@@ -1258,7 +1267,8 @@ class Question(models.Model):
     snippet = models.TextField(blank=True)
 
     # user for particular question
-    user = models.ForeignKey(User, related_name="user")
+    user = models.ForeignKey(User, related_name="user",
+                             on_delete=models.CASCADE)
 
     # Does this question allow partial grading
     partial_grading = models.BooleanField(default=False)
@@ -1533,7 +1543,8 @@ class Question(models.Model):
 ###############################################################################
 class FileUpload(models.Model):
     file = models.FileField(upload_to=get_upload_dir, blank=True)
-    question = models.ForeignKey(Question, related_name="question")
+    question = models.ForeignKey(Question, related_name="question",
+                                 on_delete=models.CASCADE)
     extract = models.BooleanField(default=False)
     hide = models.BooleanField(default=False)
 
@@ -1567,7 +1578,7 @@ class Answer(models.Model):
     """Answers submitted by the users."""
 
     # The question for which user answers.
-    question = models.ForeignKey(Question)
+    question = models.ForeignKey(Question, on_delete=models.CASCADE)
 
     # The answer submitted by the user.
     answer = models.TextField(null=True, blank=True)
@@ -1642,7 +1653,7 @@ class QuestionPaper(models.Model):
     """Question paper stores the detail of the questions."""
 
     # Question paper belongs to a particular quiz.
-    quiz = models.ForeignKey(Quiz)
+    quiz = models.ForeignKey(Quiz, on_delete=models.CASCADE)
 
     # Questions that will be mandatory in the quiz.
     fixed_questions = models.ManyToManyField(Question)
@@ -1928,10 +1939,10 @@ class AnswerPaperManager(models.Manager):
     def _get_answerpapers_for_quiz(self, questionpaper_id, course_id,
                                    status=False):
         if not status:
-            return self.filter(question_paper_id=questionpaper_id,
+            return self.filter(question_paper_id__in=questionpaper_id,
                                course_id=course_id)
         else:
-            return self.filter(question_paper_id=questionpaper_id,
+            return self.filter(question_paper_id__in=questionpaper_id,
                                course_id=course_id,
                                status="completed")
 
@@ -1973,14 +1984,15 @@ class AnswerPaperManager(models.Manager):
             .distinct()
 
     def get_user_all_attempts(self, questionpaper, user, course_id):
-        return self.filter(question_paper=questionpaper, user=user,
+        return self.filter(question_paper_id__in=questionpaper, user_id=user,
                            course_id=course_id)\
                             .order_by('-attempt_number')
 
     def get_user_data(self, user, questionpaper_id, course_id,
                       attempt_number=None):
         if attempt_number is not None:
-            papers = self.filter(user=user, question_paper_id=questionpaper_id,
+            papers = self.filter(user_id=user.id,
+                                 question_paper_id__in=questionpaper_id,
                                  course_id=course_id,
                                  attempt_number=attempt_number)
         else:
@@ -1998,7 +2010,8 @@ class AnswerPaperManager(models.Manager):
 
     def get_user_best_of_attempts_marks(self, quiz, user_id, course_id):
         best_attempt = 0.0
-        papers = self.filter(question_paper__quiz=quiz, course_id=course_id,
+        papers = self.filter(question_paper__quiz_id=quiz.id,
+                             course_id=course_id,
                              user=user_id).values("marks_obtained")
         if papers:
             best_attempt = max([marks["marks_obtained"] for marks in papers])
@@ -2010,15 +2023,15 @@ class AnswerPaper(models.Model):
     """A answer paper for a student -- one per student typically.
     """
     # The user taking this question paper.
-    user = models.ForeignKey(User)
+    user = models.ForeignKey(User, on_delete=models.CASCADE)
 
     questions = models.ManyToManyField(Question, related_name='questions')
 
     # The Quiz to which this question paper is attached to.
-    question_paper = models.ForeignKey(QuestionPaper)
+    question_paper = models.ForeignKey(QuestionPaper, on_delete=models.CASCADE)
 
     # Answepaper will be unique to the course
-    course = models.ForeignKey(Course, null=True)
+    course = models.ForeignKey(Course, null=True, on_delete=models.CASCADE)
 
     # The attempt number for the question paper.
     attempt_number = models.IntegerField()
@@ -2438,17 +2451,20 @@ class AssignmentUploadManager(models.Manager):
 
 ##############################################################################
 class AssignmentUpload(models.Model):
-    user = models.ForeignKey(User)
-    assignmentQuestion = models.ForeignKey(Question)
+    user = models.ForeignKey(User, on_delete=models.CASCADE)
+    assignmentQuestion = models.ForeignKey(Question, on_delete=models.CASCADE)
     assignmentFile = models.FileField(upload_to=get_assignment_dir)
-    question_paper = models.ForeignKey(QuestionPaper, blank=True, null=True)
-    course = models.ForeignKey(Course, null=True, blank=True)
+    question_paper = models.ForeignKey(QuestionPaper, blank=True, null=True,
+                                       on_delete=models.CASCADE)
+    course = models.ForeignKey(Course, null=True, blank=True,
+                               on_delete=models.CASCADE)
     objects = AssignmentUploadManager()
 
 
 ##############################################################################
 class TestCase(models.Model):
-    question = models.ForeignKey(Question, blank=True, null=True)
+    question = models.ForeignKey(Question, blank=True, null=True,
+                                 on_delete=models.CASCADE)
     type = models.CharField(max_length=24, choices=test_case_types, null=True)
 
 
@@ -2585,10 +2601,11 @@ class TestCaseOrder(models.Model):
     """
 
     # Answerpaper of the user.
-    answer_paper = models.ForeignKey(AnswerPaper, related_name="answer_paper")
+    answer_paper = models.ForeignKey(AnswerPaper, related_name="answer_paper",
+                                     on_delete=models.CASCADE)
 
     # Question in an answerpaper.
-    question = models.ForeignKey(Question)
+    question = models.ForeignKey(Question, on_delete=models.CASCADE)
 
     # Order of the test case for a question.
     order = models.TextField()
diff --git a/yaksh/templates/yaksh/add_question.html b/yaksh/templates/yaksh/add_question.html
index 1ad7deb..17cdcfe 100644
--- a/yaksh/templates/yaksh/add_question.html
+++ b/yaksh/templates/yaksh/add_question.html
@@ -1,6 +1,6 @@
 {% extends "manage.html" %}
 {% load custom_filters %}
-{% load staticfiles %}
+{% load static %}
 {% block title %} Add Question {% endblock title %}
 {% block pagetitle %} Add Question {% endblock pagetitle %}
 
diff --git a/yaksh/templates/yaksh/showquestions.html b/yaksh/templates/yaksh/showquestions.html
index 895c345..fdfcc60 100644
--- a/yaksh/templates/yaksh/showquestions.html
+++ b/yaksh/templates/yaksh/showquestions.html
@@ -1,5 +1,5 @@
 {% extends "manage.html" %}
-{% load staticfiles %}
+{% load static %}
 
 {% block title %} Questions {% endblock %}
 
diff --git a/yaksh/templatetags/custom_filters.py b/yaksh/templatetags/custom_filters.py
index a78440d..7dc29d4 100644
--- a/yaksh/templatetags/custom_filters.py
+++ b/yaksh/templatetags/custom_filters.py
@@ -24,12 +24,12 @@ def escape_quotes(value):
     return escape_single_and_double_quotes
 
 
-@register.assignment_tag(name="completed")
+@register.simple_tag(name="completed")
 def completed(answerpaper):
     return answerpaper.filter(status="completed").count()
 
 
-@register.assignment_tag(name="inprogress")
+@register.simple_tag(name="inprogress")
 def inprogress(answerpaper):
     return answerpaper.filter(status="inprogress").count()
 
diff --git a/yaksh/views.py b/yaksh/views.py
index 8ac8343..6d5ae08 100644
--- a/yaksh/views.py
+++ b/yaksh/views.py
@@ -114,7 +114,7 @@ def index(request, next_url=None):
     """The start page.
     """
     user = request.user
-    if user.is_authenticated():
+    if user.is_authenticated:
         if is_moderator(user):
             return my_redirect('/exam/manage/' if not next_url else next_url)
         return my_redirect("/exam/quizzes/" if not next_url else next_url)
@@ -402,7 +402,7 @@ def prof_manage(request, msg=None):
     """Take credentials of the user with professor/moderator
     rights/permissions and log in."""
     user = request.user
-    if not user.is_authenticated():
+    if not user.is_authenticated:
         return my_redirect('/exam/login')
     if not is_moderator(user):
         return my_redirect('/exam/')
@@ -411,14 +411,7 @@ def prof_manage(request, msg=None):
         is_trial=False).distinct().order_by("-active")
     paginator = Paginator(courses, 30)
     page = request.GET.get('page')
-    try:
-        courses = paginator.page(page)
-    except PageNotAnInteger:
-        # If page is not an integer, deliver first page.
-        courses = paginator.page(1)
-    except EmptyPage:
-        # If page is out of range (e.g. 9999), deliver last page of results.
-        courses = paginator.page(paginator.num_pages)
+    courses = paginator.get_page(page)
     messages.info(request, msg)
     context = {'user': user, 'objects': courses}
     return my_render_to_response(
@@ -431,7 +424,7 @@ def user_login(request):
 
     user = request.user
     context = {}
-    if user.is_authenticated():
+    if user.is_authenticated:
         return index(request)
 
     next_url = request.GET.get('next')
@@ -1048,14 +1041,7 @@ def courses(request):
         is_trial=False).order_by('-active').distinct()
     paginator = Paginator(courses, 30)
     page = request.GET.get('page')
-    try:
-        courses = paginator.page(page)
-    except PageNotAnInteger:
-        # If page is not an integer, deliver first page.
-        courses = paginator.page(1)
-    except EmptyPage:
-        # If page is out of range (e.g. 9999), deliver last page of results.
-        courses = paginator.page(paginator.num_pages)
+    courses = paginator.get_page(page)
     context = {'objects': courses, 'created': True}
     return my_render_to_response(request, 'yaksh/courses.html', context)
 
@@ -1240,12 +1226,7 @@ def monitor(request, quiz_id=None, course_id=None):
         ).order_by("-id").distinct()
         paginator = Paginator(courses, 30)
         page = request.GET.get('page')
-        try:
-            courses = paginator.page(page)
-        except PageNotAnInteger:
-            courses = paginator.page(1)
-        except EmptyPage:
-            courses = paginator.page(paginator.num_pages)
+        courses = paginator.get_page(page)
         context = {
             "papers": [], "objects": courses, "msg": "Monitor"
         }
@@ -1270,9 +1251,10 @@ def monitor(request, quiz_id=None, course_id=None):
         else:
             attempt_numbers = []
         latest_attempts = []
-        papers = AnswerPaper.objects.filter(question_paper=q_paper,
-                                            course_id=course_id).order_by(
-            'user__profile__roll_number'
+        papers = AnswerPaper.objects.filter(
+            question_paper_id=q_paper.first().id,
+            course_id=course_id).order_by(
+                'user__profile__roll_number'
         )
         users = papers.values_list('user').distinct()
         for auser in users:
@@ -1317,14 +1299,9 @@ def ajax_questions_filter(request):
         filter_dict['language'] = str(language)
     questions = Question.objects.get_queryset().filter(
                 **filter_dict).order_by('id')
-    paginator = Paginator(questions, 10)
+    paginator = Paginator(questions, 30)
     page = request.GET.get('page')
-    try:
-        questions = paginator.page(page)
-    except PageNotAnInteger:
-        questions = paginator.page(1)
-    except EmptyPage:
-        questions = paginator.page(paginator.num_pages)
+    questions = paginator.get_page(page)
     return my_render_to_response(
         request, 'yaksh/ajax_question_filter.html', {
             'questions': questions,
@@ -1518,12 +1495,7 @@ def show_all_questions(request):
     upload_form = UploadFileForm()
     paginator = Paginator(questions, 30)
     page = request.GET.get('page')
-    try:
-        questions = paginator.page(page)
-    except PageNotAnInteger:
-        questions = paginator.page(1)
-    except EmptyPage:
-        questions = paginator.page(paginator.num_pages)
+    questions = paginator.get_page(page)
     context['questions'] = questions
     context['objects'] = questions
     context['all_tags'] = all_tags
@@ -1709,12 +1681,7 @@ def grade_user(request, quiz_id=None, user_id=None, attempt_number=None,
             ).order_by("-id").distinct()
         paginator = Paginator(courses, 30)
         page = request.GET.get('page')
-        try:
-            courses = paginator.page(page)
-        except PageNotAnInteger:
-            courses = paginator.page(1)
-        except EmptyPage:
-            courses = paginator.page(paginator.num_pages)
+        courses = paginator.get_page(page)
         context = {"objects": courses, "msg": "grade"}
 
     if quiz_id is not None:
@@ -1729,9 +1696,8 @@ def grade_user(request, quiz_id=None, user_id=None, attempt_number=None,
         if not course.is_creator(current_user) and not \
                 course.is_teacher(current_user):
             raise Http404('This course does not belong to you')
-
         has_quiz_assignments = AssignmentUpload.objects.filter(
-                                question_paper_id=questionpaper_id
+                                question_paper_id__in=questionpaper_id
                                 ).exists()
         context = {
             "users": user_details,
@@ -1751,7 +1717,7 @@ def grade_user(request, quiz_id=None, user_id=None, attempt_number=None,
             except IndexError:
                 raise Http404('No attempts for paper')
             has_user_assignments = AssignmentUpload.objects.filter(
-                                question_paper_id=questionpaper_id,
+                                question_paper_id__in=questionpaper_id,
                                 user_id=user_id
                                 ).exists()
             user = User.objects.get(id=user_id)
@@ -1784,7 +1750,8 @@ def grade_user(request, quiz_id=None, user_id=None, attempt_number=None,
             paper.save()
         messages.success(request, "Student data saved successfully")
 
-        course_status = CourseStatus.objects.filter(course=course, user=user)
+        course_status = CourseStatus.objects.filter(
+            course_id=course.id, user_id=user.id)
         if course_status.exists():
             course_status.first().set_grade()
 
@@ -2621,7 +2588,6 @@ def design_module(request, module_id, course_id=None):
 
         if "Change" in request.POST:
             order_list = request.POST.get("ordered_list")
-            print(order_list)
             if order_list:
                 order_list = order_list.split(",")
                 for order in order_list:
@@ -2977,14 +2943,7 @@ def course_status(request, course_id):
     students_no = students.count()
     paginator = Paginator(students, 100)
     page = request.GET.get('page')
-    try:
-        students = paginator.page(page)
-    except PageNotAnInteger:
-        # If page is not an integer, deliver first page.
-        students = paginator.page(1)
-    except EmptyPage:
-        # If page is out of range (e.g. 9999), deliver last page of results.
-        students = paginator.page(paginator.num_pages)
+    students = paginator.get_page(page)
 
     stud_details = [(student, course.get_grade(student),
                      course.get_completion_percent(student),