Rails - Dec 2007 - Testing for the existence of templates

Hey folks,

I''ve run into the need to test for the existence of template files in  
several Rails apps I''ve worked on.  Particularly in circumstances  
where I''m rendering a partial, and use a different partial template  
for different sub-classes of a model object.  When doing so, I often  
test to make sure the template file exists first, and simply skip  
that item if no template exists.

So right now I rely on a cludgy and annoying:

File.exist?( File.join( ActionController::Base.template_root,  
"layouts", "some_subdir", "_%s.rhtml" %
method_param ))


Anyone have a better, more elegant (and less hackish) method of doing  
this?

-Justin Wienckowski
jwinky-X2/pQFfLUrBl57MIdRCFDg@public.gmane.org

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On Dec 11, 2007, at 1:41 PM, Justin Wienckowski wrote:
> I''ve run into the need to test for the existence of template files
in
> several Rails apps I''ve worked on.  Particularly in circumstances
> where I''m rendering a partial, and use a different partial
template
> for different sub-classes of a model object.  When doing so, I often
> test to make sure the template file exists first, and simply skip
> that item if no template exists.
>
> So right now I rely on a cludgy and annoying:
>
> File.exist?( File.join( ActionController::Base.template_root,
> "layouts", "some_subdir", "_%s.rhtml" %
method_param ))
>
>
> Anyone have a better, more elegant (and less hackish) method of doing
> this?
I discuss some techniques for this in
http://www.railsdev.ws/blog/3/modular-page-assembly-in-rails/

You might consider using request.controller and request.action, and/ 
or creating a hash of path names so you can centralize @path_names 
[''x''] vs hard coding those directories.

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