Rails - Jan 2006 - Re: Getting Index When Using render :partial (Benjamin Stiglitz)

Thanks for the suggestion, Ben. This seems an excellent approach to  
the problem, except that I''d been under the impression that one could  
only call render once. If you call it multiple times as the  
each_with_index loop iterates, are the results just combined  
automatically? How does that work?

Thanks!
Sean
-----
Sean McMains
AIM: SeanMcTex
http://www.mcmains.net/ruminations


On Jan 1, 2006, at 11:44 PM, rails-request@lists.rubyonrails.org wrote:
> Instead of using the :collection parameter to render, render your
> partial from inside an each_with_index, and pass in the index as a
> parameter to the partial using :locals.
>
> AC::Base#render: http://api.rubyonrails.com/classes/ActionController/
> Base.html#M000178
>
> -Ben
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> Thanks for the suggestion, Ben. This seems an excellent approach to  
> the problem, except that I''d been under the impression that one  
> could only call render once. If you call it multiple times as the  
> each_with_index loop iterates, are the results just combined  
> automatically? How does that work?
Render acts a bit different if it''s called from inside a template  
instead of inside a controller. I just looked back and realized there  
are better docs for this subject:

AV::Partials: http://api.rubyonrails.com/classes/ActionView/ 
Partials.html

One provided example:
   <%= render :partial => "account", :locals => { :account
=>
@buyer } %>

   <% for ad in @advertisements %>
     <%= render :partial => "ad", :locals => { :ad => ad }
%>
   <% end %>

The result of render will be placed at the given point in the view  
(hence the use of <%= instead of just <%).

-Ben

>    <% for ad in @advertisements %>
>      <%= render :partial => "ad", :locals => { :ad =>
ad } %>
>    <% end %>
Why not just:

<%= render :partial => ''ad'', :collection =>
@advertisements %>

It should set each item in the collection to the object ''ad''
inside the partial.

--
rick
http://techno-weenie.net

> Why not just:
>
> <%= render :partial => ''ad'', :collection =>
@advertisements %>
>
> It should set each item in the collection to the object
''ad'' inside
> the partial.
That was the documentation example; in this case, Sean would use  
each_with_index and pass the index in the :locals.

(Or, as mentioned by Justin, just use the book_counter variable; I  
didn''t know about that one.)

-Ben