discourse/app/models/user_export.rb

class UserExport < ActiveRecord::Base

  def self.get_download_path(filename)
    path = File.join(UserExport.base_directory, filename)
    File.exists?(path) ? path : nil
  end

  def self.remove_old_exports
    UserExport.where('created_at < ?', 2.days.ago).find_each do |expired_export|
      file_name = "#{expired_export.file_name}-#{expired_export.id}.csv.gz"
      file_path = "#{UserExport.base_directory}/#{file_name}"

      File.delete(file_path) if File.exist?(file_path)
      expired_export.destroy
    end
  end

  def self.base_directory
    File.join(Rails.root, "public", "uploads", "csv_exports", RailsMultisite::ConnectionManagement.current_db)
  end

end

# == Schema Information
#
# Table name: user_exports
#
#  id         :integer          not null, primary key
#  file_name  :string(255)      not null
#  user_id    :integer          not null
#  created_at :datetime
#  updated_at :datetime
#