Instrumental Invitation

invitation.rb

class Invitation < ActiveRecord::Base
  belongs_to :project
  belongs_to :invited_by, class_name: 'User'
  belongs_to :invited, class_name: 'User'

  before_create :set_token
  before_create :auto_accept
  after_create :send_email

  def set_token
    self.token ||= SecureRandom.hex(16)
  end

  def auto_accept
    if user = User.find_by_email(email)
      accept!(user)
    end
  end

  def send_email
    if accepted?
      # TODO: send notice of addition
    else
      CustomerMailer.async_email(:invitation, id)
    end
  end

  def accept!(user)
    if !accepted?
      transaction do
        self.token = nil
        self.invited = user
        self.accepted_at = Time.now
        project.memberships.create!(:user => user)
        save! unless new_record?
      end
    end
  end

  def accepted?
    accepted_at?
  end

  def to_param
    token
  end
end