Disable Rails caching in test environment?

[Tony Primerano]

Is there a way to make Rails.cache.fetch always execute the code block
in the test environment? (disable caching)

For example in my test console on Rails 3

ruby-1.9.2-rc2 > Rails.cache.fetch('foo') {'bar'}
=> "bar"
ruby-1.9.2-rc2 > Rails.cache.fetch('foo') {'bar44'}
=> "bar"

Caching is on. Using filestore

ruby-1.9.2-rc2 > Rails.cache
=> #<ActiveSupport::Cache::FileStore

Is there a ActiveSupport::Cache::Store implementation that doesn't
cache? I'm assuming I'm just missing something trivial since this is
easily disabled for page/action/fragment caching with

config.action_controller.perform_caching = false

I have...
ruby-1.9.2-rc2 >
Rails.application.config.action_controller.perform_caching
=> false

What am I missing? Thanks
Tony

[Tony Primerano]

2 solutions...

If you want caching on in test mode (good way to test it is doing what
you expect) you can simply clear the cache between tests.

def setup
Rails.cache.clear
end

Or you can write a cache that doesn't store anything.

put this in lib/active_support/cache/no_store.rb

module ActiveSupport
module Cache
class NoStore < Store
def read_entry(name, options)
return nil
end
def write_entry(name, value, options)
end
def delete_entry(name, options)
end
end
end
end

then add config.cache_store = :no_store to your test.rb file.

[Joshua Pinter]

You can also use the following in your environment configuration: 

config.cache_store = :null_store

Cheers,

JP