Setting config.active_record.observers breaks loading Rails environment

[esposito]

When I use an observer in my Rails app, loading the Rails environment does not work properly any more. The most simple way to reproduce this error is by cloning my repository:

git clone git://github.com/krikis/nomad.git
cd nomad
git checkout observer_load_error

and running

rails r "puts Post"

You should get an exception like:

/path/to/homedir/.rvm/gems/ruby-1.9.3-p125-perf@rails32/gems/railties-3.2.1/lib/rails/commands/runner.rb:53:in `eval': Expected /path/to/rails_app/app/models/post.rb to define Post (LoadError)

When I comment line 27 in my config/application.rb

config.active_record.observers = :post_observer

the code runs fine.

I ran into this issue using Rails 3.2.1

[kennyj]

I think that this is same to #4045.
I send a patch, but it had side effect, and it is reverted.

[rafaelfranca]

Please try to upgrade to 3.2.3 or 3-2-stable and see if it was fixed. I think we already fixed this bug.

[rafaelfranca]

I remember now. @kennyj thanks to explain. I'll close this issue now since #4045 have more information.

Please follow that issue.