Rails - Dec 2006 - Using data in application.rhtml layout

I''m setting up a forum and I''m having a sidebar which will
display the
recent postings and will be used throughout the site. This sidebar is
part of the application.rhtml layout.

How do I use data from the "forum" controller in this layout when the
layout is used on all of the other controllers across the site?

Could someone point me in the right direction?

Many thanks - when I get a little more advanced I hope I can contribute
as much advice as you guys have so kindly given me :-)

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I''d say the nicest/cleanest thing to do would be to set that sidebar to
be
populated via AJAX. When the page loads, send of a request to the forum
controller and update the sidebar div.

Jason

On 12/18/06, Scott Holland
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
>
>
> I''m setting up a forum and I''m having a sidebar which
will display the
> recent postings and will be used throughout the site. This sidebar is
> part of the application.rhtml layout.
>
> How do I use data from the "forum" controller in this layout when
the
> layout is used on all of the other controllers across the site?
>
> Could someone point me in the right direction?
>
> Many thanks - when I get a little more advanced I hope I can contribute
> as much advice as you guys have so kindly given me :-)
>
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>

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Jason Roelofs wrote:
> I''d say the nicest/cleanest thing to do would be to set that
sidebar to
> be
> populated via AJAX. When the page loads, send of a request to the forum
> controller and update the sidebar div.
> 
> Jason
Thanks but AJAX is something on my list to learn after I''ve got ror 
under my belt! :)

 Is there any other way to do it with application_help, or by rendering 
partials etc?

Thanks

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Well, here''s all the code you would need to get the AJAX working:

application.rhtml:
...
<div id="sidebar">
  <%= javascript_tag remote_function(:update =>
''sidebar'', :url =>
{:controller => ''forum_controller'', :action =>
''sidebar_action'' }) %>
</div>

I''m assuming the action on the forum controller already exists, and
you''d
just need a partial that renders just those items.

However, if you really want a non-ajax format, I guess you would need a
method on the Forum model (if you don''t already have that) and then in
your
application.rb you can have:

class Application ...
  after_filter :fill_in_sidebar

  def fill_in_sidebar
      @sidebar_posts = Forum.find_newest_posts
  end
end

This will call #fill_in_sidebar after any action on any controller.

Hope that helps.

Jason

On 12/18/06, Scott Holland
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
>
>
> Jason Roelofs wrote:
> > I''d say the nicest/cleanest thing to do would be to set that
sidebar to
> > be
> > populated via AJAX. When the page loads, send of a request to the
forum
> > controller and update the sidebar div.
> >
> > Jason
>
> Thanks but AJAX is something on my list to learn after I''ve got
ror
> under my belt! :)
>
> Is there any other way to do it with application_help, or by rendering
> partials etc?
>
> Thanks
>
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>

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Scott Holland wrote:
> I''m setting up a forum and I''m having a sidebar which
will display the
> recent postings and will be used throughout the site. This sidebar is
> part of the application.rhtml layout.
>
> How do I use data from the "forum" controller in this layout when
the
> layout is used on all of the other controllers across the site?
>
> Could someone point me in the right direction?
>
> Many thanks - when I get a little more advanced I hope I can contribute
> as much advice as you guys have so kindly given me :-)
>
>   
Use a partial (perhaps in a /shared folder) and populate it with an 
instance variable set up in the application controller using a 
before_filter.

So something like this

_recent_postings_sidebar.rhtml

    <% @recent_posts.each do |post| %>
        <%= post.title %>
    <% end %>

in the application controller
    :before_filter :setup_sidebar

    def setup_sidebar
        @recent_posts = Post.find(:all, :limit => 20, :order => 
"created_at DESC")
    end

and then in your layout:

render :partial => "/shared/recent_postings_sidebar"

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On Dec 18, 6:37 pm, Chris T
<ctmailingli...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
wrote:
> Scott Holland wrote:
> > I''m setting up a forum and I''m having a sidebar
which will display the
> > recent postings and will be used throughout the site. This sidebar is
> > part of theapplication.rhtml layout.
>
> > How do I use data from the "forum" controller in this layout
when the
> > layout is used on all of the other controllers across the site?
>
> > Could someone point me in the right direction?
>
> > Many thanks - when I get a little more advanced I hope I can
contribute
> > as much advice as you guys have so kindly given me :-)Use a partial
(perhaps in a /shared folder) and populate it with an
> instancevariableset up in theapplicationcontroller using a
> before_filter.
>
> So something like this
>
> _recent_postings_sidebar.rhtml
>
>     <% @recent_posts.each do |post| %>
>         <%= post.title %>
>     <% end %>
>
> in theapplicationcontroller
>     :before_filter :setup_sidebar
>
>     def setup_sidebar
>         @recent_posts = Post.find(:all, :limit => 20, :order =>
> "created_at DESC")
>     end
>
> and then in your layout:
>
> render :partial => "/shared/recent_postings_sidebar"
That worked great on my local machine, but when I uploaded it to a
server using fcgi the variable does not update once it has been
initially set.  

Any ideas?


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> So something like this
> 
> _recent_postings_sidebar.rhtml
> 
>     <% @recent_posts.each do |post| %>
>         <%= post.title %>
>     <% end %>
> 
> in the application controller
>     :before_filter :setup_sidebar
> 
>     def setup_sidebar
>         @recent_posts = Post.find(:all, :limit => 20, :order =>
> "created_at DESC")
>     end
> 
> and then in your layout:
> 
> render :partial => "/shared/recent_postings_sidebar"


This works great on my local machine, (using webrick) but when I use it 
on an apache fcgi server (dreamhost) the variable does not update after 
it has been initially set.

Anyone have any ideas how to fix this?

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