class ActiveAdmin::Generators::DeviseGenerator

def add_default_user_to_seed
  seeds_paths = Rails.application.paths["db/seeds.rb"]
  seeds_file = seeds_paths.existent.first
  return if seeds_file.nil? || !options[:default_user]
  create_user_code = "#{class_name}.create!(email: 'admin@example.com', password: 'password', password_confirmation: 'password') if Rails.env.development?"
  append_to_file seeds_file, create_user_code
end