job.rb

# But why not just this?
# More straightfoward and faster to write...

class Job < ActiveRecord::Base
  def publish
    update_attribute(:status, "published")
    JobActivityFeed.create("#{title} has been published", id)
    JobMailer.info_consultant(id, "consultant@cp.com").deliver
  end
end

job_repository.rb

class JobRepository < ActiveRecord::Base
  belongs_to :owner
  
  # Always hide ActiveRecord's native API behind a method
  def update_status(status)
    update_attribute(:status, status)
  end
end

position.rb

class Position
  PUBLISHED = "published"
  CLOSED = "closed"

  def initialize(repository)
    @repository = repository
  end

  def initialize(id)
    @repository = JobRepository.find(id)
  end

  def publish
    update_status_to_repository(PUBLISHED)
  end

  def close
    update_status_to_repository(CLOSED)
  end

  private

  def update_status_to_repository(status)
    repository.update_status(status)
    post_to_activity_feed
    info_consultant
  end
end