Add functionality to restrict access to next module based on passing previous module

3 files changed, 98 insertions, 10 deletions

diff --git a/yaksh/models.py b/yaksh/models.py
index cce90e7..5f72ecf 100644
--- a/yaksh/models.py
+++ b/yaksh/models.py
@@ -539,6 +539,18 @@ class Quiz(models.Model):
             status = "not attempted"
         return status
 
+    def get_answerpaper_passing_status(self, user, course):
+        try:
+            qp = self.questionpaper_set.get().id
+        except QuestionPaper.DoesNotExist:
+            qp = None
+        ans_ppr = AnswerPaper.objects.filter(
+            user=user, course=course, question_paper=qp
+        ).order_by("-attempt_number")
+        if ans_ppr.exists():
+            return ans_ppr.first().passed
+        return False
+
     def _create_quiz_copy(self, user):
         question_papers = self.questionpaper_set.all()
         new_quiz = self
@@ -586,7 +598,7 @@ class LearningUnit(models.Model):
     def has_prerequisite(self):
         return self.check_prerequisite
 
-    def is_prerequisite_passed(self, user, learning_module, course):
+    def is_prerequisite_complete(self, user, learning_module, course):
         ordered_units = learning_module.learning_unit.order_by("order")
         ordered_units_ids = list(ordered_units.values_list("id", flat=True))
         current_unit_index = ordered_units_ids.index(self.id)
@@ -624,6 +636,7 @@ class LearningModule(models.Model):
     order = models.IntegerField(default=0)
     creator = models.ForeignKey(User, related_name="module_creator")
     check_prerequisite = models.BooleanField(default=True)
+    check_prerequisite_passes = models.BooleanField(default=False)
     html_data = models.TextField(null=True, blank=True)
     active = models.BooleanField(default=True)
     is_trial = models.BooleanField(default=False)
@@ -653,6 +666,9 @@ class LearningModule(models.Model):
     def toggle_check_prerequisite(self):
         self.check_prerequisite = not self.check_prerequisite
 
+    def toggle_check_prerequisite_passes(self):
+        self.check_prerequisite_passes = not self.check_prerequisite_passes
+
     def get_next_unit(self, current_unit_id):
         ordered_units = self.learning_unit.order_by("order")
         ordered_units_ids = list(ordered_units.values_list("id", flat=True))
@@ -680,7 +696,7 @@ class LearningModule(models.Model):
             default_status = "inprogress"
         return default_status
 
-    def is_prerequisite_passed(self, user, course):
+    def is_prerequisite_complete(self, user, course):
         """ Check if prerequisite module is completed """
         ordered_modules = course.learning_module.order_by("order")
         ordered_modules_ids = list(ordered_modules.values_list(
@@ -698,6 +714,33 @@ class LearningModule(models.Model):
                 success = False
         return success
 
+    def get_passing_status(self, user, course):
+        course_status = CourseStatus.objects.filter(user=user, course=course)
+        state = "failed"
+        if course_status.exists():
+            ordered_units = self.learning_unit.filter(type='quiz').order_by("order")
+
+        status_list = [unit.quiz.get_answerpaper_passing_status(user, course)
+                       for unit in ordered_units]
+
+        if not status_list:
+            status = False
+        else:
+            status = all(status_list)
+        return status
+
+    def is_prerequisite_passed(self, user, course):
+        """ Check if prerequisite module is passed """
+        ordered_modules = course.learning_module.order_by("order")
+        if ordered_modules.first() == self:
+            return True
+        else:
+            if self.order == 0:
+                return True
+            prev_module = ordered_modules.get(order=self.order-1)
+            status = prev_module.get_passing_status(user, course)
+            return status
+
     def has_prerequisite(self):
         return self.check_prerequisite
 
diff --git a/yaksh/templates/yaksh/design_course_session.html b/yaksh/templates/yaksh/design_course_session.html
index 2deb95f..700d71c 100644
--- a/yaksh/templates/yaksh/design_course_session.html
+++ b/yaksh/templates/yaksh/design_course_session.html
@@ -74,13 +74,20 @@
                         <th width="5%">Select</th>
                         <th>Module</th>
                         <th width="20%">Order</th>
-                        <th width="25%" colspan="2">Check Prerequisite
+                        <th width="25%" colspan="2">Check Prerequisite Completion
                             <br>
                             <a href="#" data-toggle="tooltip" id="prereq_msg">
                                 <span class="glyphicon glyphicon-question-sign">
                                 </span> What's This
                             </a>
                         </th>
+                        <th width="25%" colspan="2">Check Prerequisite Passing
+                            <br>
+                            <a href="#" data-toggle="tooltip" id="prereq_passing_msg">
+                                <span class="glyphicon glyphicon-question-sign">
+                                </span> What's This
+                        </a>
+                        </th>
                         </tr>
                         <tr>
                             <th scope="row">&nbsp;</th>
@@ -88,6 +95,8 @@
                             <td>&nbsp;</td>
                             <th>Currently</th>
                             <th>Change</th>
+                            <th>Currently</th>
+                            <th>Change</th>
                         </tr>
                         {% for module in added_learning_modules %}
                             <tr>
@@ -109,6 +118,16 @@
                             <td>
                                 <input type="checkbox" name="check_prereq" value="{{module.id}}">
                             </td>
+                            <td>
+                                {% if module.check_prerequisite_passes %}
+                                    Yes
+                                {% else %}
+                                    No
+                                {% endif %}
+                            </td>
+                            <td>
+                                <input type="checkbox" name="check_prereq_passes" value="{{module.id}}">
+                            </td>
                             </ul>
                             </tr>
                         {% endfor %}
@@ -119,7 +138,9 @@
                 <center>
                 <button id="Remove" name="Remove" class="btn btn-danger" type="submit">Remove from course</button>
                 <button id="Change" name="Change" class="btn btn-info" type="submit"> Change Order</button>
-                <button id="Change" name="Change_prerequisite" class="btn btn-primary" type="submit"> Change Prerequisite</button>
+                <button id="Change" name="change_prerequisite_completion" class="btn btn-primary" type="submit"> Change Prerequisite Completion</button>
+                <button id="Change_prereq_passing" name="change_prerequisite_passing" class="btn btn-primary" type="submit"> Change Prerequisite Passing</button>
+
                 </center>
             </div>
         </div> <!-- /.row -->
diff --git a/yaksh/views.py b/yaksh/views.py
index 6c7a12e..5009cb6 100644
--- a/yaksh/views.py
+++ b/yaksh/views.py
@@ -471,11 +471,17 @@ def start(request, questionpaper_id=None, attempt_num=None, course_id=None,
 
     # unit module prerequiste check
     if learning_module.has_prerequisite():
-        if not learning_module.is_prerequisite_passed(user, course):
+        if not learning_module.is_prerequisite_complete(user, course):
             msg = "You have not completed the module previous to {0}".format(
                 learning_module.name)
             return course_modules(request, course_id, msg)
 
+    if learning_module.check_prerequisite_passes:
+        if not learning_module.is_prerequisite_passed(user, course):
+            msg = "You have not successfully passed the module previous to {0}".format(
+                learning_module.name)
+            return course_modules(request, course_id, msg)
+
     # is user enrolled in the course
     if not course.is_enrolled(user):
         msg = 'You are not enrolled in {0} course'.format(course.name)
@@ -501,7 +507,7 @@ def start(request, questionpaper_id=None, attempt_num=None, course_id=None,
 
     # prerequisite check and passing criteria for quiz
     if learning_unit.has_prerequisite():
-        if not learning_unit.is_prerequisite_passed(
+        if not learning_unit.is_prerequisite_complete(
                 user, learning_module, course):
             msg = "You have not completed the previous Lesson/Quiz/Exercise"
             if is_moderator(user):
@@ -2424,17 +2430,22 @@ def show_lesson(request, lesson_id, module_id, course_id):
         msg = "{0} is not active".format(learn_unit.lesson.name)
         return view_module(request, module_id, course_id, msg)
     if learn_module.has_prerequisite():
-        if not learn_module.is_prerequisite_passed(user, course):
+        if not learn_module.is_prerequisite_complete(user, course):
             msg = "You have not completed the module previous to {0}".format(
                 learn_module.name)
             return view_module(request, module_id, course_id, msg)
+    if learn_module.check_prerequisite_passes:
+        if not learn_module.is_prerequisite_passed(user, course):
+            msg = "You have not successfully passed the module previous to {0}".format(
+                learn_module.name)
+            return view_module(request, module_id, course_id, msg)
 
     # update course status with current unit
     _update_unit_status(course_id, user, learn_unit)
 
     all_modules = course.get_learning_modules()
     if learn_unit.has_prerequisite():
-        if not learn_unit.is_prerequisite_passed(user, learn_module, course):
+        if not learn_unit.is_prerequisite_complete(user, learn_module, course):
             msg = "You have not completed previous Lesson/Quiz/Exercise"
             return view_module(request, learn_module.id, course_id, msg=msg)
     context = {'lesson': learn_unit.lesson, 'user': user,
@@ -2696,13 +2707,20 @@ def design_course(request, course_id):
             if remove_values:
                 course.learning_module.remove(*remove_values)
 
-        if "Change_prerequisite" in request.POST:
+        if "change_prerequisite_completion" in request.POST:
             unit_list = request.POST.getlist("check_prereq")
             for unit in unit_list:
                 learning_module = course.learning_module.get(id=unit)
                 learning_module.toggle_check_prerequisite()
                 learning_module.save()
 
+        if "change_prerequisite_passing" in request.POST:
+            unit_list = request.POST.getlist("check_prereq_passes")
+            for unit in unit_list:
+                learning_module = course.learning_module.get(id=unit)
+                learning_module.toggle_check_prerequisite_passes()
+                learning_module.save()
+
     added_learning_modules = course.get_learning_modules()
     all_learning_modules = LearningModule.objects.filter(
         creator=user, is_trial=False)
@@ -2734,11 +2752,17 @@ def view_module(request, module_id, course_id, msg=None):
         return course_modules(request, course_id, msg)
     all_modules = course.get_learning_modules()
     if learning_module.has_prerequisite():
-        if not learning_module.is_prerequisite_passed(user, course):
+        if not learning_module.is_prerequisite_complete(user, course):
             msg = "You have not completed the module previous to {0}".format(
                 learning_module.name)
             return course_modules(request, course_id, msg)
 
+    if learning_module.check_prerequisite_passes:
+        if not learning_module.is_prerequisite_passed(user, course):
+            msg = "You have not successfully passed the module previous to {0}".format(
+                learning_module.name)
+            return course_modules(request, course_id, msg)
+
     learning_units = learning_module.get_learning_units()
     context['learning_units'] = learning_units
     context['learning_module'] = learning_module