Model

class Card < ApplicationRecord
  validates :original_text, :translated_text,
             presence: true
  validate :check_texts_for_equality
  before_create :set_review_date
  scope :needs_review, -> {where('review_date <= ?', 3.days.ago).order('RANDOM()')}

  def check_translation
    self.original_text.downcase ==
        self.translated_text.downcase
  end
  def set_new_review_date
    if check_translation
      self.review_date = Time.now
    end
  end

  private

  def check_texts_for_equality
    if original_text.downcase.squish ==
      translated_text.downcase.squish
      errors.add(:original_text, message: "U Shell not Pass")
    end
  end

  def set_review_date
    self.review_date = 3.days.since
  end

end