Q:

Reopen Impression Class from Impressionist Gem in Rails 4

I'm trying to modify the Impressionist gem class "Impression" to no avail.
I've tried the following:
class Impression
  def hello
    "world"
  end
end

Impression.class_eval do
end

both in:
/app/models/impression.rb 
and 
/lib/impression.rb     (with correct configuration to include this folder)
What am I doing wrong?  I'm using Rails 4. Ideally, I'd like to add an active record association and add some helper methods.

A:

If you're overriding a class provided by a gem, you will need to manually require your version to get your changes included. This is usually done in an initializer.

