Rails - Mar 2008 - How to use a controller/model in a different view

I am trying to put a random rss feed in the main (application) view.
The code works if I surf to /feed/, but if I use the same partial
outside of views/feeds/ I get errors about nil objects. It seems that
the partial does not automatically use it''s controller.


I hope this makes sense.

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On 19 Mar 2008, at 02:53, tresero wrote:
>
> I am trying to put a random rss feed in the main (application) view.
> The code works if I surf to /feed/, but if I use the same partial
> outside of views/feeds/ I get errors about nil objects. It seems that
> the partial does not automatically use it''s controller.
>
Partials and views don''t belong to a controller in particular (except  
in the sense that their location on disk implies the controller that  
normally uses them). Your partial probably depends on the controller  
having setup some instance variable which you are setting up in your  
FeedController, but not elsewhere.

Fred

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> The code works if I surf to /feed/, but if I use the same partial
> outside of views/feeds/ I get errors about nil objects. It seems that
just pass it the parameter it needs, no? (this will create a local 
variable, though, just to be a little more precise) -

render :partial => ''feeds/partialname'', :locals => {
:var => @var }

-- 
Posted via http://www.ruby-forum.com/.

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Unfortunately that does not work. It appears that calling a partial
does not initialize.

I have:
    @feed = Feed.find_by_handle(''handle'')
    @feed.sync if @feed
in my application controller.

in application view:

<%= render :partial => ''feeds/rss'', :locals => {
:feed => @feed } %>


Still getting a nil error:
You have a nil object when you didn''t expect it!
The error occurred while evaluating nil.url

Extracted source (around line #1):

Feed: <a href="<%= @feed.url -%>"><%= @feed.handle
-%></a><br/>
Title: <%= @feed.title -%><br/>
Description: <%= @feed.description -%><br/>

So it is never initializing feed.


On Mar 19, 2:09 am, Shai Rosenfeld
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> > The code works if I surf to /feed/, but if I use the same partial
> > outside of views/feeds/ I get errors about nil objects. It seems that
>
> just pass it the parameter it needs, no? (this will create a local
> variable, though, just to be a little more precise) -
>
> render :partial => ''feeds/partialname'', :locals =>
{ :var => @var }
>
> --
> Posted viahttp://www.ruby-forum.com/.
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Hi,

On Thu, Mar 20, 2008 at 1:16 PM, tresero
<jon-xnFomyZ2uAo4Q++5jOxPmw@public.gmane.org>
wrote:
>
>  Unfortunately that does not work. It appears that calling a partial
>  does not initialize.
>
>  I have:
>     @feed = Feed.find_by_handle(''handle'')
>     @feed.sync if @feed
>  in my application controller.
>
>  in application view:
>
>  <%= render :partial => ''feeds/rss'', :locals =>
{ :feed => @feed } %>
>
>
>  Still getting a nil error:
>  You have a nil object when you didn''t expect it!
>  The error occurred while evaluating nil.url
>
>  So it is never initializing feed.
It''s initializing "feed", not "@feed". Change your
partial to use a
local variable instead, change other places that render the partial to
provide feed as a local variable, and you should be good.


~ j.

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