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require_dependency 'article'

class Article

  has_many :group_comments, -> {
    order('created_at asc').where('group_id IS NOT NULL')
  }, class_name: 'Comment', foreign_key: 'source_id', dependent: :destroy

  validate :not_empty_group_comments_removed

  def not_empty_group_comments_removed
    if body && body_changed?
      groups_with_comments = Comment.select('DISTINCT group_id').where(source_id: self.id).map(&:group_id).compact
      groups = Nokogiri::HTML.fragment(body.to_s).css('.macro').collect{|element| element['data-macro-group_id'].to_i}
      errors[:base] << (N_('Not empty group comment cannot be removed')) unless (groups_with_comments-groups).empty?
    end
  end

end