Ruby on Rails: grouping blog posts by month


Ruby on Rails: grouping blog posts by month



Hy guys. I've created a simple blog app with the usual CRUD actions. I've also added a new action in the PostController called "archive" and an associated view. In this view I want to bring back all blog posts and group them by month, displaying them in this kind of format:

March <ul>     <li>Hello World</li>     <li>Blah blah</li>     <li>Nothing to see here</li>     <li>Test post...</li> </ul>  Febuary <ul>     <li>My hangover sucks</li>     ... etc ... 

I can't for the life of me figure out the best way to do this. Assuming the Post model has the usual title, content, created_at etc fields, can someone help me out with the logic/code? I'm very new to RoR so please bear with me :)




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group_by is a great method:.
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controller:.
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def archive   #this will return a hash in which the month names are the keys,    #and the values are arrays of the posts belonging to such months   #something like:    #{ "February" => [#<Post 0xb5c836a0>,#<Post 0xb5443a0>],   # 'March' => [#<Post 0x43443a0>] }   @posts_by_month = Posts.find(:all).group_by { |post| post.created_at.strftime("%B") } end 
view template:.
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<% @posts_by_month.each do |monthname, posts| %> <%= monthname %> <ul>    <% posts.each do |post| %>      <li><%= post.title %></li>    <% end %> </ul> <% end %> 


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@Maximiliano Guzman. Good answer! Thanks for adding value to the Rails community.

I'm including my original source on How to Create a Blog Archive with Rails, just in case I butcher the author's reasoning.

Based on the blog post, for new developers to Rails, I'd add a couple suggestions.

. First, use Active Records Posts.all method to return the Post result set for increased speed and interoperability.

The Posts.find(:all) method is known to have unforeseen issues.. Finally, along the same vein, use beginning_of_month method from the ActiveRecord core extensions.

I find beginning_of_month much more readable than strftime("%B").

Of course, the choice is yours.. Below is an example of these suggestions.

Please see the original blog post for further detail:. controllers/archives_controller.rb.
def index     @posts = Post.all(:select => "title, id, posted_at", :order => "posted_at DESC")     @post_months = @posts.group_by { |t| t.posted_at.beginning_of_month } end 
views/archives/indext.html.erb.
<div class="archives">     <h2>Blog Archive</h2>      <% @post_months.sort.reverse.each do |month, posts| %>     <h3><%=h month.strftime("%B %Y") %></h3>     <ul>         <% for post in posts %>         <li><%=h link_to post.title, post_path(post) %></li>         <% end %>     </ul>     <% end %> </div> 
Good luck and welcome to Rails!.



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