将rails更新到3.1.1我得到未初始化的常量Product :: RAILS_ROOT

Question

After updating from 3.0.1 to 3.1.1 my application according the relevant railscast i seem to get this:

uninitialized constant Product::RAILS_ROOT

Product is my main object

Answer 1

Try this instead:

Rails.root

add to_s if you need it as a string!

Answer 2

RAILS_ROOT no longer exists. Use Rails.root instead.