class PollSkip < ApplicationRecord
  belongs_to :poll
  belongs_to :user

  validate :one_vote_per_poll_per_user

  private

  def one_vote_per_poll_per_user
    already_voted = poll.poll_votes.where(user_id: user_id).any? || poll.poll_skips.where(user_id: user_id).any?
    errors.add(:base, "cannot vote more than once in one poll") if already_voted
  end
end