class GekanatorGame < ApplicationRecord
  belongs_to :user, optional: true
  belongs_to :guessed_post, class_name: 'Post'
  belongs_to :correct_post, class_name: 'Post', optional: true

  validates :answers, presence: true
  validates :question_count, numericality: { greater_than_or_equal_to: 0 }
  validates :won, inclusion: { in: [true, false] }
  validate :correct_post_required_when_lost

  private

  def correct_post_required_when_lost
    return if won || correct_post_id.present?

    errors.add(:correct_post_id, '外れた時は正解の投稿を指定してくださぃ．')
  end
end