Why does the Rails.cache.write return a different value in Rails 2.3.11 and Rails 3.2.11 console?

Question

I am trying to expire key in 10 seconds, somehow it is, but not working with rspec. In this process, I noticed Rails.cache.write return false in Rails 2.3.11, while Rails.cache.write return true in Rails 3.2.11, is this a problem? why different value? Why Rails 2.3.11 return false and Rails 3.2.11 return true?

Rails 2.3.11

irb(main):001:0> Rails.cache.write("test", "java", :expires_in => 10.seconds)
=> false

Rails 3.2.11

irb(main):001:0> Rails.cache.write("test", "java", :expires_in => 10.seconds)
=> true

I am using jruby 1.6.5.1 with Rails 2.3.11 and jruby 1.7.3 with Rails 3.2.11.

Answer 1

The Rails.cache.write method is what is sometimes known as a command method, which is called for its side effects, as opposed to a query method, called for its return value (for more info, check out command-query separation).

Since the Rails docs make no guarantees about the return value, it is probably best not to depend on it, since it might (and apparently has) change without warning.