test.rb

class User < ApplicationRecord
  has_many :orders
  
  def generate_monthly_report
    report = "Monthly Report for #{name}\n"
    report += "=" * 50 + "\n"
    
    total_orders = orders.where('created_at >= ?', 1.month.ago).count
    total_revenue = orders.where('created_at >= ?', 1.month.ago).sum(:total)
    
    report += "Total Orders: #{total_orders}\n"
    report += "Total Revenue: $#{total_revenue}\n"
    
    # Send email
    UserMailer.monthly_report(self, report).deliver_now
    
    # Log to file
    File.open("reports/user_#{id}_#{Date.today}.txt", 'w') do |f|
      f.write(report)
    end
    
    # Update last report date
    update(last_report_generated_at: Time.current)
    
    report
  end
end