Recommend similar posts

Author: samwelkanda

mysite/apps/blog/templates/blog/post/detail.html

@@ -13,6 +13,14 @@ <h1>{{ post.title }}</h1>
       Share this post
     </a>
   </p>
+  <h2>Similar posts</h2>
+  {% for post in similar_posts %}
+    <p>
+      <a href="{{ post.get_absolute_url }}">{{ post.title }}</a>
+    </p>
+  {% empty %}
+    There are no similar posts yet.
+  {% endfor %}
   {% with comments.count as total_comments %}
     <h2>
       {{ total_comments }} comment{{ total_comments|pluralize }}

mysite/apps/blog/views.py

@@ -68,13 +68,21 @@ def post_detail(request, year, month, day, post):
             new_comment.save()
     else:
         comment_form = CommentForm()
+    
+    # List of similar posts
+    post_tags_ids = post.tags.values_list('id', flat=True)
+    similar_posts = Post.published.filter(tags__in=post_tags_ids)\
+                                  .exclude(id=post.id)
+    similar_posts = similar_posts.annotate(same_tags=Count('tags'))\
+                                .order_by('-same_tags','-publish')[:4]
 
     return render(request,
                   'blog/post/detail.html',
                   {'post': post,
                    'comments': comments,
                    'new_comment': new_comment,
-                   'comment_form': comment_form,})
+                   'comment_form': comment_form,
+                   'similar_posts': similar_posts})
 
 def post_share(request, post_id):
     # Retrieve post by id