app/models/comment.rb



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class Comment < ApplicationRecord
  extend Enumerize

  belongs_to :blog

  has_many :replies, class_name: "Comment", foreign_key: "reply_to_id"
  belongs_to :reply_to, class_name: "Comment", optional: true

  validates :body, presence: true
  validates :username, presence: true
  validates :email, presence: true, format: URI::MailTo::EMAIL_REGEXP

  scope :published_and_ordered, -> { where(status: :published).order(published_at: :asc) }

  enumerize :status,
    in: [:published, :pending, :rejected],
    default: :published,
    predicates: true

  before_save :set_published_at

  def gravatar_url
    hash = Digest::MD5.hexdigest(email)
    "https://www.gravatar.com/avatar/#{hash}?size=40&default=identicon&rating=g"
  end

  private

    def set_published_at
      if self.published?
        if self.published_at.blank?
          self.published_at = DateTime.now
        end
      else
        self.published_at = nil
      end
    end

end