Rails - Feb 2007 - Is it possible to set the cache extension dynamically?

I want to cache images I have in the database along with the html that
is being put out.
But the only way I have encountered to alter the cache extension from
the default ".html" is to add
ActionController::Base.page_cache_extension = ".jpg" to config/
environment.rb.
Naturally, what I need is save the HTML as ".html" and the JPGs as
".jpg".
Does anybody know how to do that?
Thanks.
-Sebastian


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> I want to cache images I have in the database along with the html that
> is being put out.
> But the only way I have encountered to alter the cache extension from
> the default ".html" is to add
> ActionController::Base.page_cache_extension = ".jpg" to config/
> environment.rb.
> Naturally, what I need is save the HTML as ".html" and the JPGs
as
> ".jpg".
> Does anybody know how to do that?
What version of Rails?

In 1.2 you can set a route like this:

map.photo ''cache/photo/:id.jpg'', :controller =>
''home'', :action => ''photo''

Which would result in cache/photo/123.jpg being cached to disk.

In 1.16 you can do this:

map.photo ''cache/photo/:id/image.jpg'', :controller =>
''home'', :action => ''photo''

Which would result in cache/photo/123/image.jpg being cached to disk.

The key is to use a named route so in your views you can use
photo_url(:id => 123) to generate the right url.

-philip

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Philip, is it possible to use a sweeper to clean up these kinds of cached
images? If so, this might be something that''d eliminate a good bit of
wacky
code I''ve got in one of my models. Or at least move it out to a Sweeper
where it makes a little more sense.

RSL

On 2/16/07, Philip Hallstrom
<rails-SUcgGwS4C16SUMMaM/qcSw@public.gmane.org>
wrote:
>
>
> > I want to cache images I have in the database along with the html that
> > is being put out.
> > But the only way I have encountered to alter the cache extension from
> > the default ".html" is to add
> > ActionController::Base.page_cache_extension = ".jpg" to
config/
> > environment.rb.
> > Naturally, what I need is save the HTML as ".html" and the
JPGs as
> > ".jpg".
> > Does anybody know how to do that?
>
> What version of Rails?
>
> In 1.2 you can set a route like this:
>
> map.photo ''cache/photo/:id.jpg'', :controller =>
''home'', :action => ''photo''
>
> Which would result in cache/photo/123.jpg being cached to disk.
>
> In 1.16 you can do this:
>
> map.photo ''cache/photo/:id/image.jpg'', :controller =>
''home'', :action =>
> ''photo''
>
> Which would result in cache/photo/123/image.jpg being cached to disk.
>
> The key is to use a named route so in your views you can use
> photo_url(:id => 123) to generate the right url.
>
> -philip
>
> >
>
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> Philip, is it possible to use a sweeper to clean up these kinds of cached
> images? If so, this might be something that''d eliminate a good bit
of wacky
> code I''ve got in one of my models. Or at least move it out to a
Sweeper
> where it makes a little more sense.
Don''t know... never tried it :)  In my case I don''t want them
to expire
though so didn''t look into it.
>
> RSL
>
> On 2/16/07, Philip Hallstrom
<rails-SUcgGwS4C16SUMMaM/qcSw@public.gmane.org> wrote:
>>
>>
>>> I want to cache images I have in the database along with the html
that
>>> is being put out.
>>> But the only way I have encountered to alter the cache extension
from
>>> the default ".html" is to add
>>> ActionController::Base.page_cache_extension = ".jpg" to
config/
>>> environment.rb.
>>> Naturally, what I need is save the HTML as ".html" and
the JPGs as
>>> ".jpg".
>>> Does anybody know how to do that?
>>
>> What version of Rails?
>>
>> In 1.2 you can set a route like this:
>>
>> map.photo ''cache/photo/:id.jpg'', :controller =>
''home'', :action => ''photo''
>>
>> Which would result in cache/photo/123.jpg being cached to disk.
>>
>> In 1.16 you can do this:
>>
>> map.photo ''cache/photo/:id/image.jpg'', :controller
=> ''home'', :action =>
>> ''photo''
>>
>> Which would result in cache/photo/123/image.jpg being cached to disk.
>>
>> The key is to use a named route so in your views you can use
>> photo_url(:id => 123) to generate the right url.
>>
>> -philip
>>
>>>
>>
>
> >
>
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On Feb 16, 4:55 pm, Philip Hallstrom
<r...-SUcgGwS4C16SUMMaM/qcSw@public.gmane.org>
wrote:
>
> What version of Rails?
>
> In 1.2 you can set a route like this:
>
> map.photo ''cache/photo/:id.jpg'', :controller =>
''home'', :action => ''photo''
>
> Which would result in cache/photo/123.jpg being cached to disk.
>
> In 1.16 you can do this:
>
> map.photo ''cache/photo/:id/image.jpg'', :controller =>
''home'', :action => ''photo''
>
> Which would result in cache/photo/123/image.jpg being cached to disk.
>
> The key is to use a named route so in your views you can use
> photo_url(:id => 123) to generate the right url.
>
> -philip
That''s definitely a lot more flexible.
It still stops short of being able to determine the MIME type and save
the cache file with the according extension.
But it is already much better.
Thanks a lot!

-sebastian


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Well, it took me a while to get around to test it, but (of course, I
might say) what Phillip suggested is much more flexible than I first
thought:

You can declare your route like this:
map.file ''serve_file/:id.:ext''

And then send your file like this:
file_url(:action => ''serve_file'', :id => target.id, :ext
=>
target.extension)

Exactly what I needed!
Thanks again.

Sebastian


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