class Rails::Engine

def inherited(base)
  unless base.abstract_railtie?
    base.called_from = begin
      # Remove the line number from backtraces making sure we don't leave anything behind
      call_stack = caller.map { |p| p.split(':')[0..-2].join(':') }
      File.dirname(call_stack.detect { |p| p !~ %r[railties[\w\-\.]*/lib/rails|rack[\w\-\.]*/lib/rack] })
    end
  end
  super
end