You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: checkout_policy.rb
    path of file: ./repos/enju_leaf/app/policies
    
    the code of the file until where you have to start completion: class CheckoutP
    
  def destroy?
    if record.checkin && record.user
      if user.try(:has_role?, 'Librarian')
        true
      elsif user && (user == record.user)
        true
      end