Displaying posts for a passed parameter problem - Ruby on Rails

I have built a blog application using Ruby on Rails. In the application I have posts and tags. Post has_many :tags and Tag belongs_to :post.

In the /views/posts/index.html view I want to display two things. First is a listing of all posts displayed 'created_at DESC' and then in the side bar I am wanting to reference my Tags table, group records, and display as a link that allows for viewing all posts with that tag.

UPDATE: The issue of duplicate posts being displayed and posts w/o tags not displaying have been fixed. Just trying to figure out now, how to handle the /posts?tag_name=foobar request such that only the posts with that tag are displayed.

UPDATED CODE: The posts are displaying properly, no duplication. The tag count is working correctly, and the tag groups are displaying as links and passing the tag_name into /posts?tag_name=new. I just can't get the link to trigger the display of only the posts that have those tags. FYI, the posts are identified in the tag table by post_id.

PostsController

 def index
    @tag_counts = Tag.count(:group => :tag_name, :order => 'updated_at DESC', :limit => 10)
    @posts = Post.all( :order => 'created_at DESC' ).paginate :page => params[:page], :per_page => 4,
              :conditions =>开发者_开发百科; (params[:tag_name] ?
                { :tags => {:tag_name => params[:tag_name]} } : {}
                  )

    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @posts }
      format.json { render :json => @posts }
      format.atom
    end
  end

View

Recently Used Tags
        <table>
            <% @tag_counts.each do |tag_name, tag_count| %> 
                <tr>
                    <td><%= link_to(tag_name, posts_path(:tag_name => tag_name)) %></td>
                    <td>(<%=tag_count%>)</td>
                </tr>
            <% end %>
            </table>
            <br>
            <a href="/tags">click to view all tags >></a>
            </div>

This screen shot might help (please note it is really ugly as just working on function) as it shows that there is only 1 tag in new but when the URL is hit, still displaying all posts.

_{(source: squarespace.com)}

To get all posts:

@posts = Post.all.paginate :page => params[:page], :per_page => 5

To show the post's tags:

<% @posts.each do |post| %>
   <% post.tags.each do |tag| %>
      <%= tag.tag_name %>
   <% end %> 
<% end %>

I believe this is what you want.

Edit #1

To show the tags in the side bar:

<% Tags.count(:group=>"tag_name").each_pair do |key, value| %>
    <% link_name = Tags.find( key ).tag_name %>(<%= value %>)
    <%= your_link %>
<% end %>

This will show all the tags with the number of posts between ( ). But I don't know how to build your link... Maybe if you give some more info, i don't know... Do you have a search method?

Anyway... hope it helps you :]

Edit #2

Looking another question you've made and seeing some code, I believe this will solve your problem:

#view
<% Tags.count(:group=>"tag_name").each_pair do |key, value| %>
   <% tag_name = Tags.find( key ).tag_name %>
   <%= link_to(tag_name+"(#{value})", posts_path(:tag_name => tag_name)) %>
<% end %>

#controller
@posts = Post.all.paginate :page => params[:page], :per_page => 5,
   :conditions => (params[:tag_name] ?
      { :tags => {:tag_name => params[:tag_name]} } : {}
   )

Hope it works now.

A join will create a separate entry for every row - and when you've joined posts on tgas, that means the rows have become a sort of Post+Tag meta-object. So you'll get a post-tag for every tag+post there is.

You probably just want to pull out all the posts and just :include => :tags That will mean all posts will appear (regardless of whether there's a tag on it).

Of course, mixing it with the tag-conditions makes it a bit more complicated. You are not likely to find posts with no tags if you're specifically looking for posts with tags with a given name...

If there's only likely to be one tag with the given tag-name, perhaps you'd do better to do something like:

@posts = Tag.find_by_tag_name(params[:tag_name]).posts