Add edit and delete table of contents options

9 files changed, 269 insertions, 143 deletions

diff --git a/yaksh/forms.py b/yaksh/forms.py
index eedd809..ba8b7d5 100644
--- a/yaksh/forms.py
+++ b/yaksh/forms.py
@@ -652,6 +652,7 @@ class TopicForm(forms.ModelForm):
     timer = forms.CharField()
 
     def __init__(self, *args, **kwargs):
+        time = kwargs.pop("time") if "time" in kwargs else None
         super(TopicForm, self).__init__(*args, **kwargs)
         self.fields['name'].widget.attrs.update(
             {'class': form_input_class, 'placeholder': 'Topic Name'}
@@ -659,11 +660,23 @@ class TopicForm(forms.ModelForm):
         self.fields['timer'].widget.attrs.update(
             {'class': form_input_class, 'placeholder': 'Topic Time'}
         )
+        self.fields['timer'].initial = time
 
     class Meta:
         model = Topic
         fields = "__all__"
 
+    def clean_timer(self):
+        timer = self.cleaned_data.get("timer")
+        if timer:
+            try:
+                hh, mm, ss = timer.split(":")
+            except ValueError:
+                raise forms.ValidationError(
+                    "Marker time should be in the format hh:mm:ss"
+                )
+        return timer
+
 
 class VideoQuizForm(forms.ModelForm):
 
@@ -676,6 +689,7 @@ class VideoQuizForm(forms.ModelForm):
             question_type = kwargs.pop('question_type')
         else:
             question_type = "mcq"
+        time = kwargs.pop("time") if "time" in kwargs else None
         super(VideoQuizForm, self).__init__(*args, **kwargs)
         self.fields['summary'].widget.attrs.update(
             {'class': form_input_class, 'placeholder': 'Summary'}
@@ -690,7 +704,7 @@ class VideoQuizForm(forms.ModelForm):
             {'class': form_input_class, 'placeholder': 'Points'}
         )
         self.fields['type'].widget.attrs.update(
-            {'class': form_input_class, 'readonly': True}
+            {'class': form_input_class}
         )
         self.fields['type'].initial = question_type
         self.fields['description'].widget.attrs.update(
@@ -699,8 +713,20 @@ class VideoQuizForm(forms.ModelForm):
         self.fields['timer'].widget.attrs.update(
             {'class': form_input_class, 'placeholder': 'Quiz Time'}
         )
+        self.fields['timer'].initial = time
 
     class Meta:
         model = Question
         fields = ['summary', 'description', 'points',
                   'language', 'type', 'topic']
+
+    def clean_timer(self):
+        timer = self.cleaned_data.get("timer")
+        if timer:
+            try:
+                hh, mm, ss = timer.split(":")
+            except ValueError:
+                raise forms.ValidationError(
+                    "Marker time should be in the format hh:mm:ss"
+                )
+        return timer
\ No newline at end of file
diff --git a/yaksh/static/yaksh/js/lesson.js b/yaksh/static/yaksh/js/lesson.js
index 38db7d2..92038c9 100644
--- a/yaksh/static/yaksh/js/lesson.js
+++ b/yaksh/static/yaksh/js/lesson.js
@@ -16,10 +16,6 @@ $(document).ready(function() {
       seconds = seconds < 10 ? "0" + seconds : seconds;
       timer.val(hours + ":" + minutes + ":" + seconds);
     });
-    function csrfSafeMethod(method) {
-        // these HTTP methods do not require CSRF protection
-        return (/^(GET|HEAD|OPTIONS|TRACE)$/.test(method));
-    }
 
     $("#vtimer").on("change keyup paste", function() {
         player.pause();
@@ -50,95 +46,7 @@ $(document).ready(function() {
         ajax_call($(this).attr("action"), $(this).attr("method"), $(this).serialize(), csrf);
     });
 
-    function ajax_call(url, method, data, csrf) {
-        $.ajax({
-            url: url,
-            timeout: 15000,
-            method: method,
-            data: data,
-            beforeSend: function(xhr, settings) {
-              if (!csrfSafeMethod(settings.type) && !this.crossDomain) {
-                xhr.setRequestHeader("X-CSRFToken", csrf);
-              }
-            },
-            success: function(msg) {
-                unlock_screen();
-                if (msg.success) {
-                    if (msg.status) $("#lesson-content").html(msg.data);
-                    if (msg.content_type === '1') {
-                        add_topic();
-                    }
-                    else {
-                        add_question();   
-                    }
-                }
-                if (msg.toc) show_toc(msg.toc);
-                if (msg.message) alert(msg.message)
-            },
-            error: function(xhr, data) {
-                switch(xhr.status) {
-                    case 400: {
-                        unlock_screen();
-                        console.log(data.responseJSON);
-                        break;
-                    }
-                    case 500: {
-                        unlock_screen();
-                        alert('500 status code! server error');
-                        break;
-                    }
-                    case 404: {
-                        unlock_screen();
-                        alert('404 status code! server error');
-                        break;
-                    }
-                }
-            }
-        });
-    }
-
-    function add_topic() {
-        if (!$("#id_timer").val()) {
-            $("#id_timer").val($("#vtimer").val());
-        }
-        $("#topic-form").submit(function(e) {
-            e.preventDefault();
-            lock_screen();
-            var csrf = document.getElementById("topic-form").elements[0].value;
-            ajax_call($(this).attr("action"), $(this).attr("method"), $(this).serialize(), csrf);
-        });
-    }
-
-    function add_question() {
-        if (!$("#id_timer").val()) {
-            $("#id_timer").val($("#vtimer").val());
-        }
-        $("#question-form").submit(function(e) {
-            e.preventDefault();
-            lock_screen();
-            var csrf = document.getElementById("question-form").elements[0].value;
-            ajax_call($(this).attr("action"), $(this).attr("method"), $(this).serialize(), csrf);
-        });
-    }
-
-    function lock_screen() {
-        document.getElementById("ontop").style.display = "block";
-    }
-
-    function unlock_screen() {
-        document.getElementById("ontop").style.display = "none";
-    }
-
-    function show_error() {
-
-    }
-
-    function show_toc(toc) {
-        $("#lesson-content").empty();
-        $("#toc").html(toc);
-    }
-
-    $('#id_video_file').on('change',function(){
+    $('#id_video_file').on('change',function() {
         //get the file name
         var files = [];
         for (var i = 0; i < $(this)[0].files.length; i++) {
@@ -147,7 +55,7 @@ $(document).ready(function() {
         $(this).next('.custom-file-label').html(files.join(', '));
     });
 
-    $('#id_Lesson_files').on('change',function(){
+    $('#id_Lesson_files').on('change',function() {
         //get the file name
         var files = [];
         for (var i = 0; i < $(this)[0].files.length; i++) {
@@ -156,3 +64,105 @@ $(document).ready(function() {
         $(this).next('.custom-file-label').html(files.join(', '));
     });
 });
+
+
+function add_topic() {
+    if (!$("#id_timer").val()) {
+        $("#id_timer").val($("#vtimer").val());
+    }
+    $("#topic-form").submit(function(e) {
+        e.preventDefault();
+        lock_screen();
+        var csrf = document.getElementById("topic-form").elements[0].value;
+        ajax_call($(this).attr("action"), $(this).attr("method"), $(this).serialize(), csrf);
+    });
+}
+
+function add_question() {
+    if (!$("#id_timer").val()) {
+        $("#id_timer").val($("#vtimer").val());
+    }
+    $("#question-form").submit(function(e) {
+        e.preventDefault();
+        lock_screen();
+        var csrf = document.getElementById("question-form").elements[0].value;
+        ajax_call($(this).attr("action"), $(this).attr("method"), $(this).serialize(), csrf);
+    });
+}
+
+function lock_screen() {
+    document.getElementById("ontop").style.display = "block";
+}
+
+function unlock_screen() {
+    document.getElementById("ontop").style.display = "none";
+}
+
+function show_error(error) {
+    var err_msg = "\n";
+    Object.keys(err).forEach(function(key) {
+        var value = err[key];
+        err_msg = err_msg + key + " : " + value[0].message + "\n";
+    });
+    alert(err_msg);
+}
+
+function show_toc(toc) {
+    $("#lesson-content").empty();
+    $("#toc").html(toc);
+}
+
+function csrfSafeMethod(method) {
+    // these HTTP methods do not require CSRF protection
+    return (/^(GET|HEAD|OPTIONS|TRACE)$/.test(method));
+}
+
+function ajax_call(url, method, data, csrf) {
+    $.ajax({
+        url: url,
+        timeout: 15000,
+        method: method,
+        data: data,
+        beforeSend: function(xhr, settings) {
+          if (!csrfSafeMethod(settings.type) && !this.crossDomain) {
+            xhr.setRequestHeader("X-CSRFToken", csrf);
+          }
+        },
+        success: function(msg) {
+            unlock_screen();
+            if (msg.success) {
+                if (msg.status) $("#lesson-content").html(msg.data);
+                if (parseInt(msg.content_type) === 1) {
+                    add_topic();
+                }
+                else {
+                    add_question();
+                }
+            }
+            if (msg.toc) show_toc(msg.toc);
+            if (msg.message) alert(msg.message)
+        },
+        error: function(xhr, data) {
+            unlock_screen();
+            switch(xhr.status) {
+                case 400: {
+                    err = JSON.parse(xhr.responseJSON.message);
+                    show_error(err);
+                    break;
+                }
+                case 500: {
+                    alert('500 status code! server error');
+                    break;
+                }
+                case 404: {
+                    alert('404 status code! server error');
+                    break;
+                }
+                default: {
+                    alert('Unable to perform action. Please try again');
+                    break;
+                }
+            }
+        }
+    });
+}
diff --git a/yaksh/templates/yaksh/add_lesson.html b/yaksh/templates/yaksh/add_lesson.html
index 62aa881..6018e54 100644
--- a/yaksh/templates/yaksh/add_lesson.html
+++ b/yaksh/templates/yaksh/add_lesson.html
@@ -158,7 +158,13 @@
                 <div class="card-body">
                     {% if lesson_form.instance and lesson_form.instance.video_path %}
                         {% with lesson_form.instance.video_path|video_name as video %}
+                        {% if video.1 == "others" %}
+                        <video id="player" playsinline controls>
+                            <source src="{{video.0}}" />
+                        </video>
+                        {% else %}
                         <div id="player" data-plyr-provider="{{video.1}}" data-plyr-embed-id="{{video.0}}"></div>
+                        {% endif %}
                         <br>
                         <form action="{% url 'yaksh:add_marker' course_id lesson_form.instance.id %}" method="POST" id="marker-form" name="marker-form">
                             {% csrf_token %}
diff --git a/yaksh/templates/yaksh/add_topic.html b/yaksh/templates/yaksh/add_topic.html
index 8c8fdb3..52923e7 100644
--- a/yaksh/templates/yaksh/add_topic.html
+++ b/yaksh/templates/yaksh/add_topic.html
@@ -1,5 +1,5 @@
 {% if topic_id %}
-<form class="form-group" method="POST" action="{% url 'yaksh:edit_topic' content_type course_id lesson_id topic_id %}" id="topic-form">
+<form class="form-group" method="POST" action="{% url 'yaksh:edit_topic' content_type course_id lesson_id toc_id topic_id %}" id="topic-form">
 {% else %}
 <form class="form-group" method="POST" action="{% url 'yaksh:add_topic' content_type course_id lesson_id %}" id="topic-form">
 {% endif %}
diff --git a/yaksh/templates/yaksh/add_video_quiz.html b/yaksh/templates/yaksh/add_video_quiz.html
index cf59fcb..ad087bc 100644
--- a/yaksh/templates/yaksh/add_video_quiz.html
+++ b/yaksh/templates/yaksh/add_video_quiz.html
@@ -3,7 +3,7 @@
 <script type="text/javascript" src="{% static 'yaksh/js/mathjax/MathJax.js' %}?config=TeX-MML-AM_CHTML">
 </script>
 {% if question_id %}
-<form class="form-group" method="POST" action="{% url 'yaksh:edit_marker_quiz' content_type course_id lesson_id question_id %}" id="question-form">
+<form class="form-group" method="POST" action="{% url 'yaksh:edit_marker_quiz' content_type course_id lesson_id toc_id question_id %}" id="question-form">
 {% else %}
 <form class="form-group" method="POST" action="{% url 'yaksh:add_marker_quiz' content_type course_id lesson_id %}" id="question-form">
 {% endif %}
diff --git a/yaksh/templates/yaksh/show_toc.html b/yaksh/templates/yaksh/show_toc.html
index 85bcf40..b263652 100644
--- a/yaksh/templates/yaksh/show_toc.html
+++ b/yaksh/templates/yaksh/show_toc.html
@@ -1,8 +1,9 @@
 <table class="table table-responsive-sm">
 {% for toc in contents %}
+    {% with toc.get_toc_text as toc_name %}
     <tr>
         <td>
-            {{ toc.get_toc_text }}
+            {{ toc_name }}
         </td>
         <td>
             {{toc.get_content_display}}   
@@ -12,18 +13,42 @@
         </td>
         <td>
             {% if toc.content == 1 %}
-                <a href="#" class="btn btn-outline-primary" data-url="{% url 'yaksh:edit_topic' toc.content toc.course_id toc.lesson_id toc.object_id %}">
+                <a href="#" class="btn btn-outline-info" data-url="{% url 'yaksh:edit_topic' toc.content toc.course_id toc.lesson_id toc.id toc.object_id %}" id="edit-toc" onclick="edit_toc(this)">
             {% else %}
-                <a href="#" class="btn btn-outline-primary" data-url="{% url 'yaksh:edit_marker_quiz' toc.content toc.course_id toc.lesson_id toc.object_id %}">
+                <a href="#" class="btn btn-outline-info" data-url="{% url 'yaksh:edit_marker_quiz' toc.content toc.course_id toc.lesson_id toc.id toc.object_id %}" id="edit-toc" onclick="edit_toc(this)">
             {% endif %}
-                    <i class="fa fa-edit">&nbsp;Edit</i>
+                    <i class="fa fa-edit"></i>&nbsp;Edit
                 </a>
         </td>
         <td>
-            <a href="#" class="btn btn-outline-danger">
-                <i class="fa fa-trash">&nbsp;Delete</i>
-            </a>
+            <form action="{% url 'yaksh:delete_toc' toc.course_id toc.id %}" method="POST">
+                {% csrf_token %}
+                <input type="hidden" name="redirect_url" id="redirect_url" class="hidden">
+                <button class="btn btn-outline-danger" type="submit" onclick="return confirm('Are you sure you want to remove {{toc_name|capfirst}}?')">
+                    <i class="fa fa-trash"></i>&nbsp;Remove
+                </button>
+            </form>
         </td>
     </tr>
+    {% endwith %}
+{% empty %}
+    <center>
+        <span class="badge badge-warning">No Table of contents added</span>
+    </center>
 {% endfor %}
+<script type="text/javascript">
+    $(document).ready(function() {
+        var divs = document.getElementsByClassName("hidden");
+        for(var i = 0; i < divs.length; i++)
+        {
+           divs[i].value = window.location.pathname;
+        }
+    });
+
+    function edit_toc(obj) {
+        var url = obj.getAttribute("data-url");
+        lock_screen();
+        ajax_call(url, "GET");
+    }
+</script>
 </table>
\ No newline at end of file
diff --git a/yaksh/templatetags/custom_filters.py b/yaksh/templatetags/custom_filters.py
index 712df09..81c7b71 100644
--- a/yaksh/templatetags/custom_filters.py
+++ b/yaksh/templatetags/custom_filters.py
@@ -133,6 +133,5 @@ def video_name(text):
     elif 'vimeo' in video.keys():
         name, vformat = video.get('vimeo'), 'vimeo'
     else:
-        filename = os.path.basename(video.get("others"))
-        name, vformat = os.path.split(filename)
+        name, vformat = video.get('others'), 'others'
     return name, vformat
diff --git a/yaksh/urls.py b/yaksh/urls.py
index 2c462b3..d7fd410 100644
--- a/yaksh/urls.py
+++ b/yaksh/urls.py
@@ -241,18 +241,13 @@ urlpatterns = [
          name='add_marker'),
     path('manage/add/lesson/topic/<int:content_type>/<int:course_id>/<int:lesson_id>',
          views.add_topic, name='add_topic'),
-    path('manage/edit/lesson/topic/<int:content_type>/<int:course_id>/<int:lesson_id>/<int:topic_id>',
-         views.add_topic, name='edit_topic'),
+    path('manage/edit/lesson/topic/<int:content_type>/<int:course_id>/<int:lesson_id>/'
+         '<int:toc_id>/<int:topic_id>', views.add_topic, name='edit_topic'),
     path('manage/add/lesson/quiz/<int:content_type>/<int:course_id>/<int:lesson_id>',
          views.add_marker_quiz, name='add_marker_quiz'),
-    path('manage/edit/lesson/quiz/<int:content_type>/<int:course_id>/<int:lesson_id>/<int:question_id>',
-         views.add_marker_quiz, name='edit_marker_quiz'),
-    path('manage/add/lesson/exercise/<int:content_type>/<int:course_id>/<int:lesson_id>',
-         views.add_marker_quiz, name='add_marker_quiz'),
-    path('manage/edit/lesson/exercise/<int:content_type>/<int:course_id>/<int:lesson_id>/<int:question_id>',
-         views.add_marker_quiz, name='edit_marker_quiz'),
-    path('manage/add/lesson/poll/<int:content_type>/<int:course_id>/<int:lesson_id>',
-         views.add_marker_quiz, name='add_marker_quiz'),
-    path('manage/edit/lesson/poll/<int:content_type>/<int:course_id>/<int:lesson_id>/<int:question_id>',
-         views.add_marker_quiz, name='edit_marker_quiz')
+    path('manage/edit/lesson/quiz/<int:content_type>/<int:course_id>/<int:lesson_id>/'
+         '<int:toc_id>/<int:question_id>', views.add_marker_quiz,
+         name='edit_marker_quiz'),
+    path('manage/remove/lesson/toc/<int:course_id>/<int:toc_id>',
+         views.delete_toc, name='delete_toc'),
 ]
diff --git a/yaksh/views.py b/yaksh/views.py
index db46d90..60d72e9 100644
--- a/yaksh/views.py
+++ b/yaksh/views.py
@@ -2686,6 +2686,9 @@ def show_lesson(request, lesson_id, module_id, course_id):
 
     # update course status with current unit
     _update_unit_status(course_id, user, learn_unit)
+    toc = TableOfContents.objects.filter(
+        course_id=course_id, lesson_id=lesson_id
+    )
 
     all_modules = course.get_learning_modules()
     if learn_unit.has_prerequisite():
@@ -2695,7 +2698,7 @@ def show_lesson(request, lesson_id, module_id, course_id):
     context = {'lesson': learn_unit.lesson, 'user': user,
                'course': course, 'state': "lesson", "all_modules": all_modules,
                'learning_units': learning_units, "current_unit": learn_unit,
-               'learning_module': learn_module}
+               'learning_module': learn_module, 'toc': toc}
     return my_render_to_response(request, 'yaksh/show_video.html', context)
 
 
@@ -3478,14 +3481,26 @@ def get_tc_formset(question_type, post=None, question=None):
         Question, tc, form=TestcaseForm, extra=1, fields="__all__",
     )
     formset = TestcaseFormset(
-         post, initial=[{'type': tc_class}], instance=question
+        post, initial=[{'type': tc_class}], instance=question
     )
     return formset, tc_class
 
 
+def get_toc_contents(request, course_id, lesson_id):
+    contents = TableOfContents.objects.filter(
+        course_id=course_id, lesson_id=lesson_id
+    )
+    data = loader.render_to_string(
+        "yaksh/show_toc.html", context={'contents': contents},
+        request=request
+    )
+    return data
+
+
 @login_required
 @email_verified
-def add_topic(request, content_type, course_id, lesson_id, topic_id=None):
+def add_topic(request, content_type, course_id, lesson_id, toc_id=None,
+              topic_id=None):
     user = request.user
     course = get_object_or_404(Course, pk=course_id)
     if (not is_moderator(user) or
@@ -3495,25 +3510,26 @@ def add_topic(request, content_type, course_id, lesson_id, topic_id=None):
         topic = get_object_or_404(Topic, pk=topic_id)
     else:
         topic = None
+    if toc_id:
+        toc = get_object_or_404(TableOfContents, pk=toc_id)
+    else:
+        toc = None
     context = {}
     if request.method == "POST":
         form = TopicForm(request.POST, instance=topic)
         if form.is_valid():
             form.save()
+            time = request.POST.get("timer")
             if not topic:
                 TableOfContents.objects.create(
                     content_object=form.instance, course_id=course_id,
                     lesson_id=lesson_id, content=content_type,
-                    time=request.POST.get("timer")
-                )
-                contents = TableOfContents.objects.filter(
-                        course_id=course_id, lesson_id=lesson_id
-                )
-                data = loader.render_to_string(
-                    "yaksh/show_toc.html", context={'contents': contents},
-                    request=request
+                    time=time
                 )
-                context['toc'] = data
+            context['toc'] = get_toc_contents(request, course_id, lesson_id)
+            if toc:
+                toc.time = time
+                toc.save()
             status_code = 200
             context['success'] = True
             context['message'] = 'Added topic successfully'
@@ -3521,13 +3537,26 @@ def add_topic(request, content_type, course_id, lesson_id, topic_id=None):
             status_code = 400
             context['success'] = False
             context['message'] = form.errors.as_json()
+    else:
+        form = TopicForm(instance=topic, time=toc.time)
+        template_context = {'form': form, 'course_id': course.id,
+                   'lesson_id': lesson_id, 'content_type': content_type,
+                   'topic_id': topic_id, 'toc_id': toc_id}
+        data = loader.render_to_string(
+            "yaksh/add_topic.html", context=template_context, request=request
+        )
+        context['success'] = True
+        context['data'] = data
+        context['content_type'] = content_type
+        context['status'] = 1
+        status_code = 200
     return JsonResponse(context, status=status_code)
 
 
 @login_required
 @email_verified
 def add_marker_quiz(request, content_type, course_id, lesson_id,
-                    question_id=None):
+                    toc_id=None, question_id=None):
     user = request.user
     course = get_object_or_404(Course, pk=course_id)
     if (not is_moderator(user) or
@@ -3537,32 +3566,34 @@ def add_marker_quiz(request, content_type, course_id, lesson_id,
         question = get_object_or_404(Question, pk=question_id)
     else:
         question = None
+    if toc_id:
+        toc = get_object_or_404(TableOfContents, pk=toc_id)
+    else:
+        toc = None
     context = {}
     if request.method == "POST":
         qform = VideoQuizForm(request.POST, instance=question)
         if qform.is_valid():
-            qform.save(commit=False)
-            qform.instance.user = user
+            if not question_id:
+                qform.save(commit=False)
+                qform.instance.user = user
             qform.save()
             formset, tc_class = get_tc_formset(
                 qform.instance.type, request.POST, qform.instance
             )
             if formset.is_valid():
                 formset.save()
+                time = request.POST.get("timer")
                 if not question:
                     TableOfContents.objects.create(
                         content_object=qform.instance, course_id=course_id,
                         lesson_id=lesson_id, content=content_type,
-                        time=request.POST.get("timer")
+                        time=time
                     )
-                    contents = TableOfContents.objects.filter(
-                        course_id=course_id, lesson_id=lesson_id
-                    )
-                    data = loader.render_to_string(
-                        "yaksh/show_toc.html", context={'contents': contents},
-                        request=request
-                    )
-                    context['toc'] = data
+                context['toc'] = get_toc_contents(request, course_id, lesson_id)
+                if toc:
+                    toc.time = time
+                    toc.save()
                 status_code = 200
                 context['success'] = True
                 context['message'] = 'Added question successfully'
@@ -3570,9 +3601,43 @@ def add_marker_quiz(request, content_type, course_id, lesson_id,
             else:
                 status_code = 400
                 context['success'] = False
-                context['message'] = formset.errors.as_json()
+                context['message'] = "Error in saving form"
         else:
             status_code = 400
             context['success'] = False
             context['message'] = qform.errors.as_json()
+    else:
+        form = VideoQuizForm(instance=question, time=toc.time)
+        formset, tc_class = get_tc_formset(question.type, question=question)
+        template_context = {
+            'form': form, 'course_id': course.id, 'lesson_id': lesson_id,
+            'formset': formset, 'tc_class': tc_class, 'toc_id': toc_id,
+            'content_type': content_type, 'question_id': question_id
+        }
+        data = loader.render_to_string(
+            "yaksh/add_video_quiz.html", context=template_context,
+            request=request
+        )
+        context['success'] = True
+        context['data'] = data
+        context['content_type'] = content_type
+        context['status'] = 2
+        status_code = 200
     return JsonResponse(context, status=status_code)
+
+
+@login_required
+@email_verified
+def delete_toc(request, course_id, toc_id):
+    user = request.user
+    course = get_object_or_404(Course, pk=course_id)
+    if (not is_moderator(user) or
+            not course.is_creator(user) or not course.is_creator(user)):
+        raise Http404("You are not allowed to view this page")
+    toc = get_object_or_404(TableOfContents, pk=toc_id)
+    redirect_url = request.POST.get("redirect_url")
+    if toc.content == 1:
+        get_object_or_404(Topic, pk=toc.object_id).delete()
+    else:
+        get_object_or_404(Question, id=toc.object_id).delete()
+    return redirect(redirect_url)