rails_enums.md

class Post < ActiveRecord::Base
  STATUS = %w(draft published)

  def draft?
    status == 'draft'
  end

  def published?
    status == 'published'
  end
end

changes to

class Post < ActiveRecord::Base
  enum status: %w(draft published)
end

# Query method
post.draft?
post.published?

# Action method
post.draft!
post.published!