Rails action caching with querystring parameters

Question

How can I cache my REST controller with Rails where my actions have query string parameters?

Example: GET /products/all.xml?max_price=200

T

Answer 1

If you want to cache an action, based on all the query parameters (or say on nearly all of them), you can do:

caches_action :my_action, :cache_path => Proc.new { |c| c.params }

Or, maybe you want all but some params that you just use for Analytics (but that have no bearing on the records you're fetching):

caches_action :my_action, :cache_path => Proc.new { |c| c.params.delete_if { |k,v| k.starts_with?('utm_') } }

Answer 2

In this case you should use fragments caching:

in your controller:

cache(params[:max_price], :expires_in => 10.minute) do
  # get the result
end

Answer 3

To use the request url as cache key I do something like this:

caches_action :index, :cache_path => Proc.new {|c| c.request.url }