class Invitation < ApplicationRecord
  # Relations
  belongs_to :user

  validates_presence_of :user

  before_create :generate_token

  scope :unused, -> { where(used_at: nil) }
  scope :used, -> { where.not(used_at: nil) }

  private

  def generate_token
    self.token = SecureRandom.hex(8)
  end
end