In Rails 3.1, how can I cache the results of a AR query to a cache?

Question

For an AR query like this:

@users = User.find(some_conditions_here)

then @users is an AR array and I want to cache this.

If I do, in one controller call, a

Rails.cache.write('foo',@users)

it doesn't complain or error out and I can even see a 'foo' under /tmp/cache with a non-zero size but a subsequent controller call to

Rails.cache.read('foo')

returns a nil. When I do both the write and read from a Rails console, it works as expected. What is it about doing it via a controller that causes this problem?

This used to work before in Rails 2... what am I missing?

Answer 1

Check that config.action_controller.perform_caching is set to true .

To quote the Rails caching guide ,

caching is disabled by default for development and test, and enabled for production