app/models/title.rb
class Title < ActiveRecord::Base
## included modules and attr_*
attr_protected
## associations
has_many :releases
has_many :releasers, through: :releases
has_many :subscriptions, dependent: :delete_all
has_many :users, through: :subscriptions, uniq: true
## scopes
scope :with_name, ->(name){ where(name: name) }
## validations
validates :name, uniqueness: true
end