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: file_push.rb
    path of file: ./repos/PasswordPusher/app/models
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

class FilePush < ApplicationRecord
  has_many :views, dependent: :destroy
  has_encrypted :payload, :note, :passphrase

  has_many_attached :files

  belongs_to :user

  def t
    
  def validate!
    return if expired

    # Range checking
    self.expire_after_days ||= Settings.files.expire_after_days_default
    self.expire_after_views ||= Settings.files.expire_after_views_default

    unless expire_after_days.between?(Settings.files.expire_after_days_min, Settings.files.expire_after_days_max)
      self.expire_after_days = Settings.files.expire_after_days_default
    end