Resolve conflicts in travis, requirements and views

14 files changed, 1066 insertions, 42 deletions

diff --git a/.travis.yml b/.travis.yml
index e6fd3a4..09b262a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,6 +21,7 @@ install:
 
 before_script:
   - python manage.py makemigrations notifications_plugin
+  - python manage.py makemigrations
   - python manage.py migrate auth
   - python manage.py migrate
 
diff --git a/requirements/requirements-common.txt b/requirements/requirements-common.txt
index 5e6680c..aae82f3 100644
--- a/requirements/requirements-common.txt
+++ b/requirements/requirements-common.txt
@@ -15,3 +15,4 @@ redis==3.4.1
 notifications-plugin==0.1.2
 django-celery-beat==2.0.0
 django-celery-results==1.2.1
+Pillow
diff --git a/yaksh/admin.py b/yaksh/admin.py
index 9c36a98..3d3ba89 100644
--- a/yaksh/admin.py
+++ b/yaksh/admin.py
@@ -1,7 +1,7 @@
 from yaksh.models import Question, Quiz, QuestionPaper, Profile
 from yaksh.models import (TestCase, StandardTestCase, StdIOBasedTestCase,
                           Course, AnswerPaper, CourseStatus, LearningModule,
-                          Lesson
+                          Lesson, Post, Comment
                           )
 from django.contrib import admin
 
@@ -48,6 +48,8 @@ class QuizAdmin(admin.ModelAdmin):
 admin.site.register(Profile, ProfileAdmin)
 admin.site.register(Question)
 admin.site.register(TestCase)
+admin.site.register(Post)
+admin.site.register(Comment)
 admin.site.register(StandardTestCase)
 admin.site.register(StdIOBasedTestCase)
 admin.site.register(Course, CourseAdmin)
diff --git a/yaksh/forms.py b/yaksh/forms.py
index 81b067c..216f5c2 100644
--- a/yaksh/forms.py
+++ b/yaksh/forms.py
@@ -1,7 +1,7 @@
 from django import forms
 from yaksh.models import (
     get_model_class, Profile, Quiz, Question, Course, QuestionPaper, Lesson,
-    LearningModule, TestCase, languages, question_types
+    LearningModule, TestCase, languages, question_types, Post, Comment
 )
 from grades.models import GradingSystem
 from django.contrib.auth import authenticate
@@ -32,7 +32,7 @@ test_case_types = (
 )
 
 status_types = (
-    ('select','Select Status'),
+    ('select', 'Select Status'),
     ('active', 'Active'),
     ('closed', 'Inactive'),
     )
@@ -381,7 +381,7 @@ class SearchFilterForm(forms.Form):
     search_tags = forms.CharField(
         label='Search Tags',
         widget=forms.TextInput(attrs={'placeholder': 'Search',
-                                      'class': form_input_class,}),
+                                      'class': form_input_class, }),
         required=False
         )
     search_status = forms.ChoiceField(
@@ -571,3 +571,44 @@ class TestcaseForm(forms.ModelForm):
     class Meta:
         model = TestCase
         fields = ["type"]
+
+
+class PostForm(forms.ModelForm):
+    class Meta:
+        model = Post
+        fields = ["title", "description", "image"]
+        widgets = {
+            'title': forms.TextInput(
+                attrs={
+                    'class': 'form-control'
+                }
+            ),
+            'description': forms.Textarea(
+                attrs={
+                    'class': 'form-control'
+                }
+            ),
+            'image': forms.FileInput(
+                attrs={
+                    'class': 'form-control-file'
+                }
+            )
+        }
+
+
+class CommentForm(forms.ModelForm):
+    class Meta:
+        model = Comment
+        fields = ["description", "image"]
+        widgets = {
+            'description': forms.Textarea(
+                attrs={
+                    'class': 'form-control'
+                }
+            ),
+            'image': forms.FileInput(
+                attrs={
+                    'class': 'form-control-file'
+                }
+            )
+        }
diff --git a/yaksh/models.py b/yaksh/models.py
index 5d4d453..9bcb132 100644
--- a/yaksh/models.py
+++ b/yaksh/models.py
@@ -1,5 +1,6 @@
 from __future__ import unicode_literals, division
 from datetime import datetime, timedelta
+import uuid
 import json
 import random
 import ruamel.yaml
@@ -10,6 +11,7 @@ from collections import Counter, defaultdict
 
 from django.db import models
 from django.contrib.auth.models import User, Group, Permission
+from django.core.exceptions import ValidationError
 from django.contrib.contenttypes.models import ContentType
 from taggit.managers import TaggableManager
 from django.utils import timezone
@@ -232,6 +234,19 @@ def render_template(template_path, data=None):
     return render
 
 
+def validate_image(image):
+    file_size = image.file.size
+    limit_mb = 30
+    if file_size > limit_mb * 1024 * 1024:
+        raise ValidationError("Max size of file is {0} MB".format(limit_mb))
+
+
+def get_image_dir(instance, filename):
+    return os.sep.join((
+        'post_%s' % (instance.uid), filename
+    ))
+
+
 ###############################################################################
 class CourseManager(models.Manager):
 
@@ -1162,7 +1177,9 @@ 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__contains='default')
+                grading_system = GradingSystem.objects.get(
+                    name__contains='default'
+                )
             else:
                 grading_system = self.course.grading_system
             grade = grading_system.get_grade(self.percentage)
@@ -2632,4 +2649,38 @@ class TestCaseOrder(models.Model):
     # Order of the test case for a question.
     order = models.TextField()
 
+
 ##############################################################################
+class ForumBase(models.Model):
+    uid = models.UUIDField(unique=True, default=uuid.uuid4, editable=False)
+    creator = models.ForeignKey(User, on_delete=models.CASCADE)
+    description = models.TextField()
+    created_at = models.DateTimeField(auto_now_add=True)
+    modified_at = models.DateTimeField(auto_now=True)
+    image = models.ImageField(upload_to=get_image_dir, blank=True,
+                              null=True, validators=[validate_image])
+    active = models.BooleanField(default=True)
+
+
+class Post(ForumBase):
+    title = models.CharField(max_length=200)
+    course = models.ForeignKey(Course,
+                               on_delete=models.CASCADE, related_name='post')
+
+    def __str__(self):
+        return self.title
+
+    def get_last_comment(self):
+        return self.comment.last()
+
+    def get_comments_count(self):
+        return self.comment.filter(active=True).count()
+
+
+class Comment(ForumBase):
+    post_field = models.ForeignKey(Post, on_delete=models.CASCADE,
+                                   related_name='comment')
+
+    def __str__(self):
+        return 'Comment by {0}: {1}'.format(self.creator.username,
+                                            self.post_field.title)
diff --git a/yaksh/static/yaksh/css/custom.css b/yaksh/static/yaksh/css/custom.css
index 63ee455..3979e3e 100644
--- a/yaksh/static/yaksh/css/custom.css
+++ b/yaksh/static/yaksh/css/custom.css
@@ -97,3 +97,24 @@ body, .dropdown-menu {
     min-height: 100vh;
     transition: all 0.3s;
 }
+
+/* ---------------------------------------------------
+    FORUM STYLE
+----------------------------------------------------- */
+
+.brown-light {
+    background: #f4a460;
+    padding-left: 0.3em;
+    padding-right: 0.3em;
+    padding-top: 0.2em;
+    padding-bottom: 0.2em;
+}
+
+.post_image, .comment_image {
+    width: 50%;
+    height: 50%;
+}
+
+.description {
+    font-size: 16px;
+}
\ No newline at end of file
diff --git a/yaksh/templates/yaksh/course_detail_options.html b/yaksh/templates/yaksh/course_detail_options.html
index 90662d6..4dd4dda 100644
--- a/yaksh/templates/yaksh/course_detail_options.html
+++ b/yaksh/templates/yaksh/course_detail_options.html
@@ -30,6 +30,11 @@
         </a>
     </li>
     <li class="nav-item">
+        <a href="{% url 'yaksh:course_forum' course.id %}" class="nav-link list-group-item" title="Discussion forum of this course" data-placement="top" data-toggle="tooltip">
+            Discussion Forum
+        </a>
+    </li>
+    <li class="nav-item">
         <a class="nav-link list-group-item {% if is_add_teacher %} active {% endif %}" href="{% url 'yaksh:search_teacher' course.id %}" data-toggle="tooltip" title="Add Teachers/TAs to this course" data-placement="top">
         Add Teachers/TAs
         </a>
diff --git a/yaksh/templates/yaksh/course_forum.html b/yaksh/templates/yaksh/course_forum.html
new file mode 100644
index 0000000..e6b6a90
--- /dev/null
+++ b/yaksh/templates/yaksh/course_forum.html
@@ -0,0 +1,115 @@
+{% extends base_template %}
+{% load static %}
+{% block title %}
+    {{course.name}}: Discussion Forum
+{% endblock title %}
+{% block content %}
+    <div class="container">
+        <div>
+            <h2><center>{{course.name}}</center></h2>
+            <center>Discussion Forum</center>
+        </div>
+        <div class="d-flex p-2 bd-highlight">
+            <div class="col-md-4">
+                {% if moderator %}
+                    <a href="{% url 'yaksh:course_detail' course.id %}" class="btn btn-primary">Back to Course</a>
+                {% else %}
+                    <a href="{% url 'yaksh:course_modules' course.id %}" class="btn btn-primary">Back to Course</a>
+                {% endif %}
+            </div>
+            <div class="col-md-4">
+                <form class="my-2 my-lg-0" action="" method="GET">
+                    <div class="input-group">
+                        <input type="search" placeholder="Search" name="search" class="form-control">
+                        <span class="input-group-append">
+                            <button class="btn btn-outline-info" type="submit"><i class="fa fa-search"></i>&nbsp;Search</button>
+                        </span>
+                    </div>
+                </form>
+            </div>
+            <div class="col-md-4">
+                <button type="button" class="btn btn-primary pull-right" data-toggle="modal" data-target="#newPostModal">New Post</button>
+            </div>
+        </div>
+        <!-- Modal -->
+        <div id="newPostModal" class="modal fade" role="dialog">
+          <div class="modal-dialog">
+
+            <!-- Modal content-->
+            <div class="modal-content">
+              <div class="modal-header">
+                <h4 class="modal-title">Create a new Post</h4>
+                <button type="button" class="close" data-dismiss="modal">&times;</button>
+              </div>
+              <div class="modal-body">
+                <form action="." method="POST" enctype='multipart/form-data'>
+                    <div class="form-group">
+                        {% csrf_token %}
+                        {{form}}
+                    </div>
+                    <input type="submit" class="btn btn-primary" value="Create Post">
+                </form>
+              </div>
+              <div class="modal-footer">
+                <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
+              </div>
+            </div>
+            
+          </div>
+        </div>
+        <br>
+        <br>
+        {% if posts %}
+            <table id="posts_table" class="tablesorter table">
+                <thead class="thread-inverse">
+                    <tr>
+                        <th width="700">Questions</th>
+                        <th>Created by</th>
+                        <th>Replies</th>
+                        <th>Last reply</th>
+                        <th></th>
+                    </tr>
+                </thead>
+                <tbody>
+                    {% for post in posts %}
+                        <tr>
+                            <td>
+                                <a href="{% url 'yaksh:post_comments' course.id post.uid %}">{{post.title}}</a>
+                                <small class="text-muted d-block">{{ post.description|truncatewords:30 }}</small>
+                                <small class="text-muted"><strong>Last updated: {{post.modified_at}}</strong></small>
+                            </td>
+                            <td>{{post.creator.username}}</td>
+                            <td>{{post.get_comments_count}}</td>
+                            <td>
+                                {% with post.get_last_comment as last_comment %}
+                                    {% if last_comment %}
+                                        {{last_comment.creator}}
+                                    {% else %}
+                                        None
+                                    {% endif %}
+                                {% endwith %}
+                            </td>
+                            <td>
+                                {% if user.profile.is_moderator %}
+                                    <small><a href="{% url 'yaksh:hide_post' course.id post.uid %}" class="pull-right btn btn-danger">Delete</i></a></small>
+                                {% endif %}
+                            </td>
+                        </tr>
+                    {% endfor %}
+                </tbody>
+            </table>
+        {% else %}
+            No discussion posts are there yet. Create one to start discussing.
+        {% endif %}
+        {% include "yaksh/paginator.html" %}
+    </div>
+{% endblock content %}
+{% block script %}
+      <script type="text/javascript" src="{% static 'yaksh/js/mathjax/MathJax.js' %}?config=TeX-MML-AM_CHTML"></script>
+      <script type="text/javascript" src="{% static 'yaksh/js/jquery.tablesorter.min.js' %}"></script>
+      <script type="text/javascript">
+        $(document).ready(() => {
+            $("#posts_table").tablesorter();
+        });
+      </script>
+{% endblock script %}
\ No newline at end of file
diff --git a/yaksh/templates/yaksh/course_modules.html b/yaksh/templates/yaksh/course_modules.html
index dd7b68d..b808562 100644
--- a/yaksh/templates/yaksh/course_modules.html
+++ b/yaksh/templates/yaksh/course_modules.html
@@ -7,6 +7,7 @@
     <div class="card">
         <div class="card-header">
             {{ course.name }}
+            <a href="{% url "yaksh:course_forum" course.id %}" class="btn btn-info pull-right">Discussion Forum</a>
         </div>
         <div class="card-body">
             {% if course.view_grade %}
diff --git a/yaksh/templates/yaksh/post_comments.html b/yaksh/templates/yaksh/post_comments.html
new file mode 100644
index 0000000..463103e
--- /dev/null
+++ b/yaksh/templates/yaksh/post_comments.html
@@ -0,0 +1,71 @@
+{% extends base_template %}
+{% load static %}
+{% block title %}
+    {{post.title}}
+{% endblock title %}
+
+{% block content %}
+    <div class="container">
+        <a class="btn btn-primary" href="{% url 'yaksh:course_forum' post.course.id %}">Back to Posts</a>
+        <br>
+        <br>
+        <div class="card mb-2 border-dark">
+            <div class="card-header text-white bg-dark py-2 px-3">
+                {{post.title}}
+                <br>
+                <small>
+                    <strong>{{post.creator.username}}</strong>
+                    {{post.created_at}}
+                    {% if user.profile.is_moderator %}<a href="{% url 'yaksh:hide_post' post.course.id post.uid %}" class="pull-right btn btn-danger">Delete</a>{% endif %}
+                </small>
+
+            </div>
+            <div class="card-body">
+                <p class="card-text description">{{post.description}}</p>
+                {% if post.image %}
+                    <a href="{{post.image.url}}" target="_blank">
+                        <center><img src="{{post.image.url}}" class="post_image thumbnail" alt=""></center>
+                    </a>
+                {% endif %}
+            </div>
+        </div>
+        <br>
+        {% if comments %}
+            {% for comment in comments %}
+                <div class="card mb-2">
+                    <div class="card-body p-3">
+                        <div class="row mb-3">
+                            <div class="col-6">
+                                <strong class="text-muted">{{comment.creator.username}}</strong>
+                            </div>
+                            <div class="col-6 text-right">
+                                <small class="text-muted">{{comment.created_at}} {% if user.profile.is_moderator %} <a href="{% url 'yaksh:hide_comment' post.course.id comment.uid %}" class="btn btn-danger">Delete</a>{% endif %}</small>
+                            </div>
+                        </div>
+                        <p class="card-text description">{{comment.description}}</p>
+                        <div>
+                            {% if comment.image %}
+                                <a href="{{comment.image.url}}" target="_blank">
+                                    <center><img src="{{comment.image.url}}" class="comment_image thumbnail" alt=""></center>
+                                </a>
+                            {% endif %}
+                        </div>
+                    </div>
+                </div>
+            {% endfor %}
+        {% endif %}
+        <br>
+        <div>
+            <form action="{% url 'yaksh:post_comments' post.course.id post.uid %}" method="POST" enctype='multipart/form-data'>
+                <div class="form-group">
+                    {% csrf_token %}
+                    {{form}}
+                </div>
+                <input type="submit" value="Submit" class="btn btn-primary">
+            </form>
+        </div>
+    </div>
+{% endblock content %}
+{% block script %}
+      <script type="text/javascript" src="{% static 'yaksh/js/mathjax/MathJax.js' %}?config=TeX-MML-AM_CHTML"></script>
+{% endblock script %}
\ No newline at end of file
diff --git a/yaksh/test_models.py b/yaksh/test_models.py
index a60a1d6..4e6b1ae 100644
--- a/yaksh/test_models.py
+++ b/yaksh/test_models.py
@@ -5,7 +5,7 @@ from yaksh.models import User, Profile, Question, Quiz, QuestionPaper,\
     QuestionSet, AnswerPaper, Answer, Course, StandardTestCase,\
     StdIOBasedTestCase, FileUpload, McqTestCase, AssignmentUpload,\
     LearningModule, LearningUnit, Lesson, LessonFile, CourseStatus, \
-    create_group, legend_display_types
+    create_group, legend_display_types, Post, Comment
 from yaksh.code_server import (
     ServerPool, get_result as get_result_from_code_server
     )
@@ -191,7 +191,6 @@ class LearningModuleTestCases(unittest.TestCase):
         self.prereq_course.students.add(self.student)
         self.prereq_course.save()
 
-
     def tearDown(self):
         # Remove unit from course status completed units
         self.course_status.completed_units.remove(self.learning_unit_one)
@@ -495,7 +494,7 @@ class QuestionTestCases(unittest.TestCase):
         self.assertEqual(self.question1.snippet, 'def myfunc()')
         tag_list = []
         for tag in self.question1.tags.all():
-                    tag_list.append(tag.name)
+            tag_list.append(tag.name)
         for tag in tag_list:
             self.assertIn(tag, ['python', 'function'])
 
@@ -2239,3 +2238,129 @@ class FileUploadTestCases(unittest.TestCase):
         if os.path.isfile(self.file_upload.file.path):
             os.remove(self.file_upload.file.path)
         self.file_upload.delete()
+
+
+class PostModelTestCases(unittest.TestCase):
+    def setUp(self):
+        self.user1 = User.objects.create(
+            username='bart',
+            password='bart',
+            email='bart@test.com'
+        )
+        Profile.objects.create(
+            user=self.user1,
+            roll_number=1,
+            institute='IIT',
+            department='Chemical',
+            position='Student'
+        )
+
+        self.user2 = User.objects.create(
+            username='dart',
+            password='dart',
+            email='dart@test.com'
+        )
+        Profile.objects.create(
+            user=self.user2,
+            roll_number=2,
+            institute='IIT',
+            department='Chemical',
+            position='Student'
+        )
+
+        self.user3 = User.objects.create(
+            username='user3',
+            password='user3',
+            email='user3@test.com'
+        )
+        Profile.objects.create(
+            user=self.user3,
+            roll_number=3,
+            is_moderator=True,
+            department='Chemical',
+            position='Teacher'
+        )
+
+        self.course = Course.objects.create(
+            name='Python Course',
+            enrollment='Enroll Request',
+            creator=self.user3
+        )
+        self.post1 = Post.objects.create(
+            title='Post 1',
+            course=self.course,
+            creator=self.user1,
+            description='Post 1 description'
+        )
+        self.comment1 = Comment.objects.create(
+            post_field=self.post1,
+            creator=self.user2,
+            description='Post 1 comment 1'
+        )
+        self.comment2 = Comment.objects.create(
+            post_field=self.post1,
+            creator=self.user3,
+            description='Post 1 user3 comment 2'
+        )
+
+    def test_get_last_comment(self):
+        last_comment = self.post1.get_last_comment()
+        self.assertEquals(last_comment.description, 'Post 1 user3 comment 2')
+
+    def test_get_comments_count(self):
+        count = self.post1.get_comments_count()
+        self.assertEquals(count, 2)
+
+    def test__str__(self):
+        self.assertEquals(str(self.post1.title), self.post1.title)
+
+    def tearDown(self):
+        self.user1.delete()
+        self.user2.delete()
+        self.user3.delete()
+        self.course.delete()
+        self.post1.delete()
+
+
+class CommentModelTestCases(unittest.TestCase):
+    def setUp(self):
+        self.user1 = User.objects.create(
+            username='bart',
+            password='bart',
+            email='bart@test.com'
+        )
+        Profile.objects.create(
+            user=self.user1,
+            roll_number=1,
+            institute='IIT',
+            department='Chemical',
+            position='Student'
+        )
+        self.course = Course.objects.create(
+            name='Python Course',
+            enrollment='Enroll Request',
+            creator=self.user1
+        )
+        self.post1 = Post.objects.create(
+            title='Post 1',
+            course=self.course,
+            creator=self.user1,
+            description='Post 1 description'
+        )
+        self.comment1 = Comment.objects.create(
+            post_field=self.post1,
+            creator=self.user1,
+            description='Post 1 comment 1'
+        )
+
+    def test__str__(self):
+        self.assertEquals(
+            str(self.comment1.post_field.title),
+            self.comment1.post_field.title
+    )
+
+    def tearDown(self):
+        self.user1.delete()
+        self.course.delete()
+        self.post1.delete()
+        self.comment1.delete()
\ No newline at end of file
diff --git a/yaksh/test_views.py b/yaksh/test_views.py
index ecfe872..70b090a 100644
--- a/yaksh/test_views.py
+++ b/yaksh/test_views.py
@@ -12,7 +12,7 @@ import shutil
 from markdown import Markdown
 from django.contrib.auth.models import Group
 from django.contrib.auth import authenticate
-from django.urls import reverse
+from django.urls import reverse, resolve
 from django.test import TestCase
 from django.test import Client
 from django.http import Http404
@@ -30,9 +30,10 @@ from yaksh.models import (
     User, Profile, Question, Quiz, QuestionPaper, AnswerPaper, Answer, Course,
     AssignmentUpload, McqTestCase, IntegerTestCase, StringTestCase,
     FloatTestCase, FIXTURES_DIR_PATH, LearningModule, LearningUnit, Lesson,
-    LessonFile, CourseStatus, dict_to_yaml
+    LessonFile, CourseStatus, dict_to_yaml, Post, Comment
 )
-from yaksh.views import add_as_moderator
+from yaksh.views import add_as_moderator, course_forum, post_comments
+from yaksh.forms import PostForm, CommentForm
 from yaksh.decorators import user_has_profile
 from online_test.celery import app
 
@@ -1126,11 +1127,10 @@ class TestAddQuiz(TestCase):
         If not logged in redirect to login page
         """
         response = self.client.get(
-            reverse('yaksh:add_quiz',
-                kwargs={'course_id': self.course.id,
-                        'module_id': self.module.id}),
-                follow=True
-            )
+            reverse('yaksh:add_quiz', kwargs={
+                'course_id': self.course.id,
+                'module_id': self.module.id
+            }), follow=True)
         redirect_destination = (
             '/exam/login/?next=/exam/manage/addquiz/{0}/{1}/'.format(
                 self.course.id, self.module.id
@@ -1147,11 +1147,10 @@ class TestAddQuiz(TestCase):
             password=self.student_plaintext_pass
         )
         response = self.client.get(
-            reverse('yaksh:add_quiz',
-                kwargs={'course_id': self.course.id,
-                        'module_id': self.module.id}),
-                follow=True
-            )
+            reverse('yaksh:add_quiz', kwargs={
+                'course_id': self.course.id,
+                'module_id': self.module.id
+            }), follow=True)
         self.assertEqual(response.status_code, 404)
 
     def test_add_quiz_get(self):
@@ -1163,11 +1162,10 @@ class TestAddQuiz(TestCase):
             password=self.user_plaintext_pass
         )
         response = self.client.get(
-            reverse('yaksh:add_quiz',
-                kwargs={'course_id': self.course.id,
-                        'module_id': self.module.id}
-                )
-            )
+            reverse('yaksh:add_quiz', kwargs={
+                'course_id': self.course.id,
+                'module_id': self.module.id
+            }))
         self.assertEqual(response.status_code, 200)
         self.assertTemplateUsed(response, 'yaksh/add_quiz.html')
         self.assertIsNotNone(response.context['form'])
@@ -1182,10 +1180,11 @@ class TestAddQuiz(TestCase):
         )
         tzone = pytz.timezone('UTC')
         response = self.client.post(
-            reverse('yaksh:edit_quiz',
-                kwargs={'course_id': self.course.id,
-                        'module_id': self.module.id,
-                        'quiz_id': self.quiz.id}),
+            reverse('yaksh:edit_quiz', kwargs={
+                'course_id': self.course.id,
+                'module_id': self.module.id,
+                'quiz_id': self.quiz.id
+            }),
             data={
                 'start_date_time': '2016-01-10 09:00:15',
                 'end_date_time': '2016-01-15 09:00:15',
@@ -1319,10 +1318,11 @@ class TestAddQuiz(TestCase):
             password=self.user_plaintext_pass
         )
         response = self.client.post(
-            reverse('yaksh:edit_exercise',
-                kwargs={'course_id': self.course.id,
-                        'module_id': self.module.id,
-                        'quiz_id': self.exercise.id}),
+            reverse('yaksh:edit_exercise', kwargs={
+                'course_id': self.course.id,
+                'module_id': self.module.id,
+                'quiz_id': self.exercise.id
+            }),
             data={
                 'description': 'updated demo exercise',
                 'active': True
@@ -1347,9 +1347,10 @@ class TestAddQuiz(TestCase):
             password=self.user_plaintext_pass
         )
         response = self.client.post(
-            reverse('yaksh:add_exercise',
-                kwargs={'course_id': self.course.id,
-                        'module_id': self.module.id}),
+            reverse('yaksh:add_exercise', kwargs={
+                'course_id': self.course.id,
+                'module_id': self.module.id
+            }),
             data={
                 'description': "Demo Exercise",
                 'active': True
@@ -2284,7 +2285,7 @@ class TestSearchFilters(TestCase):
         # Create moderator group
         self.mod_group = Group.objects.create(name="moderator")
 
-        #Create user1 with profile
+        # Create user1 with profile
         self.user1_plaintext_pass = "demo1"
         self.user1 = User.objects.create_user(
             username='demo_user1',
@@ -4336,7 +4337,9 @@ class TestDownloadCsv(TestCase):
                     kwargs={'course_id': self.course.id}),
             follow=True
             )
-        file_name = "{0}.csv".format(self.course.name.lower().replace(" ", "_"))
+        file_name = "{0}.csv".format(
+            self.course.name.lower().replace(" ", "_")
+        )
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.get('Content-Disposition'),
                          'attachment; filename="{0}"'.format(file_name))
@@ -6314,3 +6317,475 @@ class TestLessons(TestCase):
             )
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.json()['data'], '<p>test description</p>')
+
+
+class TestPost(TestCase):
+    def setUp(self):
+        self.client = Client()
+        self.mod_group = Group.objects.create(name='moderator')
+
+        self.student_plaintext_pass = 'student'
+        self.student = User.objects.create_user(
+            username='student',
+            password=self.student_plaintext_pass,
+            first_name='first_name',
+            last_name='last_name',
+            email='student@test.com'
+        )
+
+        Profile.objects.create(
+            user=self.student,
+            roll_number=10,
+            institute='IIT',
+            department='Chemical',
+            position='student',
+            timezone='UTC'
+        )
+
+        # moderator
+        self.user_plaintext_pass = 'demo'
+        self.user = User.objects.create_user(
+            username='demo_user',
+            password=self.user_plaintext_pass,
+            first_name='first_name',
+            last_name='last_name',
+            email='demo@test.com'
+        )
+
+        Profile.objects.create(
+            user=self.user,
+            roll_number=10,
+            institute='IIT',
+            department='Chemical',
+            position='Moderator',
+            timezone='UTC'
+        )
+
+        self.course = Course.objects.create(
+            name="Python Course",
+            enrollment="Enroll Request", creator=self.user
+        )
+
+    def test_csrf(self):
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:course_forum', kwargs={
+            'course_id': self.course.id
+        })
+        response = self.client.get(url)
+        self.assertContains(response, 'csrfmiddlewaretoken')
+
+    def test_view_course_forum_denies_anonymous_user(self):
+        url = reverse('yaksh:course_forum', kwargs= {
+            'course_id': self.course.id
+        })
+        response = self.client.get(url, follow=True)
+        self.assertEqual(response.status_code, 200)
+        redirection_url = '/exam/login/?next=/exam/forum/{0}/'.format(
+            str(self.course.id)
+            )
+        self.assertRedirects(response, redirection_url)
+
+    def test_view_course_forum(self):
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:course_forum', kwargs={
+            'course_id': self.course.id
+        })
+        response = self.client.get(url, follow=True)
+        self.assertEquals(response.status_code, 200)
+        self.assertTemplateUsed(response, 'yaksh/course_forum.html')
+
+    def test_view_course_forum_not_found_status_code(self):
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:course_forum', kwargs={
+            'course_id': 99
+        })
+        response = self.client.get(url)
+        self.assertEquals(response.status_code, 404)
+
+    def test_course_forum_url_resolves_course_forum_view(self):
+        view = resolve('/exam/forum/1/')
+        self.assertEqual(view.func, course_forum)
+
+    def test_course_forum_contains_link_to_post_comments_page(self):
+        # create a post in setup
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:course_forum', kwargs={
+            'course_id': self.course.id
+        })
+        post = Post.objects.create(
+            title='post 1',
+            description='post 1 description',
+            course=self.course,
+            creator=self.student
+        )
+        response = self.client.get(url)
+        post_comments_url = reverse('yaksh:post_comments', kwargs={
+            'course_id': self.course.id,
+            'uuid': post.uid
+        })
+        self.assertContains(response, 'href="{0}'.format(post_comments_url))
+
+
+    def test_new_post_valid_post_data(self):
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:course_forum', kwargs={
+            'course_id': self.course.id
+        })
+        data = {
+            "title": 'Post 1',
+            "description": 'Post 1 description',
+        }
+        response = self.client.post(url, data)
+        # This shouldn't be 302. Check where does it redirects.
+        result = Post.objects.filter(title='Post 1',
+                                     creator=self.student,
+                                     course=self.course)
+        self.assertTrue(result.exists())
+
+    def test_new_post_invalid_post_data(self):
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:course_forum', kwargs={
+            'course_id': self.course.id
+        })
+        data = {}
+        response = self.client.post(url, data)
+        self.assertEquals(response.status_code, 200)
+
+    def test_new_post_invalid_post_data_empty_fields(self):
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:course_forum', kwargs={
+            'course_id': self.course.id
+        })
+        data = {
+            "title": '',
+            "description": '',
+        }
+        response = self.client.post(url, data)
+        self.assertEquals(response.status_code, 200)
+        self.assertFalse(Post.objects.exists())
+
+    def test_contains_form(self):
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:course_forum', kwargs={
+            'course_id': self.course.id
+        })
+        response = self.client.get(url)
+        form = response.context.get('form')
+        self.assertIsInstance(form, PostForm)
+
+    def test_open_created_post_denies_anonymous_user(self):
+        post = Post.objects.create(
+            title='post 1',
+            description='post 1 description',
+            course=self.course,
+            creator=self.student
+        )
+        url = reverse('yaksh:post_comments', kwargs={
+            'course_id': self.course.id,
+            'uuid': post.uid
+        })
+        response = self.client.get(url, follow=True)
+        self.assertEqual(response.status_code, 200)
+        redirection_url = '/exam/login/?next=/exam/forum/{0}/post/{1}/'.format(
+                str(self.course.id), str(post.uid)
+            )
+        self.assertRedirects(response, redirection_url)
+
+    def test_new_post_invalid_post_data(self):
+        """
+        Invalid post data should not redirect
+        The expected behavior is to show form again with validation errors
+        """
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:course_forum', kwargs={
+            'course_id': self.course.id
+        })
+        data = {}
+        response = self.client.post(url, data)
+        form = response.context.get('form')
+        self.assertEquals(response.status_code, 200)
+        self.assertTrue(form.errors)
+
+    def test_hide_post(self):
+        self.client.login(
+            username=self.user.username,
+            password=self.user_plaintext_pass
+        )
+        self.course.students.add(self.user)
+        post = Post.objects.create(
+            title='post 1',
+            description='post 1 description',
+            course=self.course,
+            creator=self.user
+        )
+        url = reverse('yaksh:hide_post', kwargs={
+            'course_id': self.course.id,
+            'uuid': post.uid
+        })
+        response = self.client.get(url, follow=True)
+        self.assertEqual(response.status_code, 200)
+
+    def tearDown(self):
+        self.client.logout()
+        self.user.delete()
+        self.course.delete()
+        self.mod_group.delete()
+
+
+class TestPostComment(TestCase):
+    def setUp(self):
+        self.client = Client()
+        self.mod_group = Group.objects.create(name='moderator')
+
+        self.student_plaintext_pass = 'student'
+        self.student = User.objects.create_user(
+            username='student',
+            password=self.student_plaintext_pass,
+            first_name='first_name',
+            last_name='last_name',
+            email='student@test.com'
+        )
+
+        Profile.objects.create(
+            user=self.student,
+            roll_number=10,
+            institute='IIT',
+            department='Chemical',
+            position='student',
+            timezone='UTC'
+        )
+
+        # moderator
+        self.user_plaintext_pass = 'demo'
+        self.user = User.objects.create_user(
+            username='demo_user',
+            password=self.user_plaintext_pass,
+            first_name='first_name',
+            last_name='last_name',
+            email='demo@test.com'
+        )
+
+        Profile.objects.create(
+            user=self.user,
+            roll_number=10,
+            institute='IIT',
+            department='Chemical',
+            position='Moderator',
+            timezone='UTC'
+        )
+
+        self.course = Course.objects.create(
+            name="Python Course",
+            enrollment="Enroll Request", creator=self.user
+        )
+
+        self.post = Post.objects.create(
+            title='post 1',
+            description='post 1 description',
+            course=self.course,
+            creator=self.student
+        )
+
+    def test_csrf(self):
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:post_comments', kwargs={
+            'course_id': self.course.id,
+            'uuid': self.post.uid
+        })
+        response = self.client.get(url)
+        self.assertContains(response, 'csrfmiddlewaretoken')
+
+    def test_post_comments_view_success_status_code(self):
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:post_comments', kwargs={
+            'course_id': self.course.id,
+            'uuid': self.post.uid
+        })
+        response = self.client.get(url)
+        self.assertEquals(response.status_code, 200)
+
+    def test_post_comments_view_not_found_status_code(self):
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:post_comments', kwargs={
+            'course_id': 99,
+            'uuid': '90da38ad-06fa-451b-9e82-5035e839da90'
+        })
+        response = self.client.get(url)
+        self.assertEquals(response.status_code, 404)
+
+    def test_post_comments_url_resolves_post_comments_view(self):
+        view = resolve(
+            '/exam/forum/1/post/90da38ad-06fa-451b-9e82-5035e839da89/'
+        )
+        self.assertEquals(view.func, post_comments)
+
+    def test_post_comments_view_contains_link_back_to_course_forum_view(self):
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        comment_url = reverse('yaksh:post_comments', kwargs={
+            'course_id': self.course.id,
+            'uuid': self.post.uid
+        })
+        course_forum_url = reverse('yaksh:course_forum', kwargs={
+            'course_id': self.course.id
+        })
+        response = self.client.get(comment_url)
+        self.assertContains(response, 'href="{0}"'.format(course_forum_url))
+
+    def test_post_comments_valid_post_data(self):
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:post_comments', kwargs={
+            'course_id': self.course.id,
+            'uuid': self.post.uid
+        })
+        data = {
+            'post_field': self.post,
+            'description': 'post 1 comment',
+            'creator': self.user,
+        }
+        response = self.client.post(url, data)
+        self.assertEquals(response.status_code, 302)
+        result = Comment.objects.filter(post_field__uid=self.post.uid)
+        self.assertTrue(result.exists())
+
+    def test_post_comments_invalid_post_data(self):
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:post_comments', kwargs={
+            'course_id': self.course.id,
+            'uuid': self.post.uid
+        })
+        data = {}
+        response = self.client.post(url, data)
+        self.assertEquals(response.status_code, 200)
+
+    def test_post_comments_post_data_empty_fields(self):
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:post_comments', kwargs={
+            'course_id': self.course.id,
+            'uuid': self.post.uid
+        })
+        data = {
+            'post_field': '',
+            'description': '',
+            'creator': '',
+        }
+        response = self.client.post(url, data)
+        self.assertEquals(response.status_code, 200)
+        self.assertFalse(Comment.objects.exists())
+
+    def test_contains_form(self):
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:post_comments', kwargs={
+            'course_id': self.course.id,
+            'uuid': self.post.uid
+        })
+        response = self.client.get(url)
+        form = response.context.get('form')
+        self.assertIsInstance(form, CommentForm)
+
+    def post_comment_invalid_post_data(self):
+        self.client.login(
+            username=self.student.username,
+            password=self.student_plaintext_pass
+        )
+        self.course.students.add(self.student)
+        url = reverse('yaksh:post_comments', kwargs={
+            'course_id': self.course.id,
+            'uuid': self.post.uid
+        })
+        data = {}
+        response = self.client.post(url, data)
+        form = response.context.get('form')
+        self.assertEquals(response.status_code, 200)
+        self.assertTrue(form.errors)
+
+    def test_hide_post_comment(self):
+        self.client.login(
+            username=self.user.username,
+            password=self.user_plaintext_pass
+        )
+        self.course.students.add(self.user)
+        comment = Comment.objects.create(
+            post_field=self.post,
+            description='post 1 comment',
+            creator=self.user
+        )
+        url = reverse('yaksh:hide_comment', kwargs={
+            'course_id': self.course.id,
+            'uuid': comment.uid
+        })
+        response = self.client.get(url)
+        self.assertEquals(response.status_code, 302)
+
+    def tearDown(self):
+        self.client.logout()
+        self.user.delete()
+        self.course.delete()
+        self.mod_group.delete()
diff --git a/yaksh/urls.py b/yaksh/urls.py
index 30adefc..b530e99 100644
--- a/yaksh/urls.py
+++ b/yaksh/urls.py
@@ -60,6 +60,18 @@ urlpatterns = [
         views.get_next_unit, name='next_unit'),
     url(r'^course_modules/(?P<course_id>\d+)/$',
         views.course_modules, name='course_modules'),
+    url(r'^forum/(?P<course_id>\d+)/$',
+        views.course_forum,
+        name='course_forum'),
+    url(r'^forum/(?P<course_id>\d+)/post/(?P<uuid>[0-9a-f-]+)/$',
+        views.post_comments,
+        name='post_comments'),
+    url(r'^forum/(?P<course_id>\d+)/post/(?P<uuid>[0-9a-f-]+)/delete/',
+        views.hide_post,
+        name='hide_post'),
+    url(r'^forum/(?P<course_id>\d+)/comment/(?P<uuid>[0-9a-f-]+)/delete/',
+        views.hide_comment,
+        name='hide_comment'),
     url(r'^manage/$', views.prof_manage, name='manage'),
     url(r'^manage/addquestion/$', views.add_question, name="add_question"),
     url(r'^manage/addquestion/(?P<question_id>\d+)/$', views.add_question,
diff --git a/yaksh/views.py b/yaksh/views.py
index 217ae24..7ed799f 100644
--- a/yaksh/views.py
+++ b/yaksh/views.py
@@ -1,6 +1,6 @@
 import os
 import csv
-from django.http import HttpResponse, JsonResponse
+from django.http import HttpResponse, JsonResponse, HttpResponseRedirect
 from django.contrib.auth import login, logout, authenticate
 from django.shortcuts import render, get_object_or_404, redirect
 from django.template import Context, Template
@@ -37,14 +37,14 @@ from yaksh.models import (
     QuestionPaper, QuestionSet, Quiz, Question, StandardTestCase,
     StdIOBasedTestCase, StringTestCase, TestCase, User,
     get_model_class, FIXTURES_DIR_PATH, MOD_GROUP_NAME, Lesson, LessonFile,
-    LearningUnit, LearningModule, CourseStatus, question_types
+    LearningUnit, LearningModule, CourseStatus, question_types, Post, Comment
 )
 from yaksh.forms import (
     UserRegisterForm, UserLoginForm, QuizForm, QuestionForm,
     QuestionFilterForm, CourseForm, ProfileForm,
     UploadFileForm, FileForm, QuestionPaperForm, LessonForm,
     LessonFileForm, LearningModuleForm, ExerciseForm, TestcaseForm,
-    SearchFilterForm
+    SearchFilterForm, PostForm, CommentForm
 )
 from yaksh.settings import SERVER_POOL_PORT, SERVER_HOST_NAME
 from .settings import URL_ROOT
@@ -3279,3 +3279,106 @@ def mark_notification(request, message_uid=None):
                 user.id, msg_uuids, True)
     messages.success(request, "Marked notifcation(s) as read")
     return redirect(reverse("yaksh:view_notifications"))
+
+
+@login_required
+@email_verified
+def course_forum(request, course_id):
+    user = request.user
+    base_template = 'user.html'
+    moderator = False
+    if is_moderator(user):
+        base_template = 'manage.html'
+        moderator = True
+    course = get_object_or_404(Course, id=course_id)
+    if (not course.is_creator(user) and not course.is_teacher(user)
+            and not course.is_student(user)):
+        raise Http404('You are not enrolled in {0} course'.format(course.name))
+    if 'search' in request.GET:
+        search_term = request.GET['search']
+        posts = course.post.filter(active=True, title__icontains=search_term)
+    else:
+        posts = course.post.filter(active=True).order_by('-modified_at')
+    paginator = Paginator(posts, 10)
+    page = request.GET.get('page')
+    posts = paginator.get_page(page)
+    if request.method == "POST":
+        form = PostForm(request.POST, request.FILES)
+        if form.is_valid():
+            new_post = form.save(commit=False)
+            new_post.creator = user
+            new_post.course = course
+            new_post.save()
+            return redirect('yaksh:post_comments',
+                            course_id=course.id, uuid=new_post.uid)
+    else:
+        form = PostForm()
+    return render(request, 'yaksh/course_forum.html', {
+        'user': user,
+        'course': course,
+        'base_template': base_template,
+        'posts': posts,
+        'moderator': moderator,
+        'objects': posts,
+        'form': form,
+        'user': user
+        })
+
+
+@login_required
+@email_verified
+def post_comments(request, course_id, uuid):
+    user = request.user
+    base_template = 'user.html'
+    if is_moderator(user):
+        base_template = 'manage.html'
+    post = get_object_or_404(Post, uid=uuid)
+    comments = post.comment.filter(active=True)
+    course = get_object_or_404(Course, id=course_id)
+    if (not course.is_creator(user) and not course.is_teacher(user)
+            and not course.is_student(user)):
+        raise Http404('You are not enrolled in {0} course'.format(course.name))
+    form = CommentForm()
+    if request.method == "POST":
+        form = CommentForm(request.POST, request.FILES)
+        if form.is_valid():
+            new_comment = form.save(commit=False)
+            new_comment.creator = request.user
+            new_comment.post_field = post
+            new_comment.save()
+            return redirect(request.path_info)
+    return render(request, 'yaksh/post_comments.html', {
+        'post': post,
+        'comments': comments,
+        'base_template': base_template,
+        'form': form,
+        'user': user
+        })
+
+
+@login_required
+@email_verified
+def hide_post(request, course_id, uuid):
+    user = request.user
+    course = get_object_or_404(Course, id=course_id)
+    if (not course.is_creator(user) and not course.is_teacher(user)):
+        raise Http404('You are not enrolled in {0} course'.format(course.name))
+    post = get_object_or_404(Post, uid=uuid)
+    post.comment.active = False
+    post.active = False
+    post.save()
+    return redirect('yaksh:course_forum', course_id)
+
+
+@login_required
+@email_verified
+def hide_comment(request, course_id, uuid):
+    user = request.user
+    course = get_object_or_404(Course, id=course_id)
+    if (not course.is_creator(user) and not course.is_teacher(user)):
+        raise Http404('You are not enrolled in {0} course'.format(course.name))
+    comment = get_object_or_404(Comment, uid=uuid)
+    post_uid = comment.post_field.uid
+    comment.active = False
+    comment.save()
+    return redirect('yaksh:post_comments', course_id, post_uid)