gistfile1.txt

class User < ApplicationRecord
  validates :sc_external_id, presence: true, uniqueness: true, length: { minimum: 10 }
  has_one :profile, dependent: :destroy

  has_many :photos, dependent: :destroy
  accepts_nested_attributes_for :photos, allow_destroy: true, reject_if: :reject_if_photo_limit_reached
  validates_associated :photos

  private

  def reject_if_photo_limit_reached
    if photos.count > 6
      true    
    else
      false
    end
  end
end