gistfile1.rb

class Controller
  def create
    creator = OrganizationCreator.new(FeedWriter.new(self))
    creator.create_for(current_user, params[:organization])
  end

  def create_organization_succeeded(organization)
    redirect_to '/foo', :notice => 'success'
  end
end

class FeedWriter < Struct.new(:listener)
  def create_organization_succeeded(organization)
    ActivityFeed.create!(:message => 'Organization created...')
    listener.create_organization_succeeded(organization)
  end
end

class OrganizationCreator < Struct.new(:listener)
  def create_for(user, attributes)
    # ...

    if organization.save
      # ...
      listener.create_organization_succeeded(organization)
    else
      # ...
    end
  end
end