caches_page caching a javascript response

rubyonrails-talk
1

I am using caches_page to cache a controller action which returns javascript

  caches_page :show_county

  def show_county     @county = County.find(params[:id])

    respond_to do |format|       format.js     end

  However when I hit the page, the server caches it as a html:

Cached page: /home/show_county/22.html (1.1ms)

This is obviously causing problems on subsequent hits. I am using rails 2.2.2

Any ideas on why the page is cached as .html and how do I rectify this?

Diarmuid

2

Diamuid, this is the standard behavior of caches_page. If you’re

looking to cache only HTML, I would recommend the following:

caches_page :show_county, :if => Proc.new { |c| c.request.format.html? }

Good luck,

-Conrad

3

Conrad

Thanks for the response.

However my problem is that I *want* it to cache the response as a *js* file (ie 22.js) and then on subsequent hits the server will return this file.

I tried :

  caches_page :show_county, :if => Proc.new {|c|     c.request.format.js?   }

but that didn't help matters.

Even in a Railscast I watched (#89 Page Caching - RailsCasts caching) I can see the correct behaviour but for some reason I cannot replicate that behaviour

4

OK

I think I have solved this issue. Adding the solution to help others. I also have one question that I don't undestand below, maybe someone could enlighten me

The problem is that by default the caching mechanism will use the same extension of the request to store the cached file. If no extension exists (/home/show_county/22) then the default is .html

Next was the figure out how to get the request to have the js extension.

This is done by setting an argument to url_for :format => :js This doesn't seem to be well documented (Ruby on Rails - APIdock ActionController/Base/url_for only in the comments!) but it did work.

*However as a consequence of this I had to rename some views from xxx.html.erb to xxx.erb, I don't know why? Anyone?*

Once I did this, the request was sent as a .js which was then cached as a 22.js and on subsequent hits was returned as a javascript file.

Done

Diarmuid