今あるデータから雑に FactoryGirl の定義生成するやつ

scope_to_factory.rb

def scope_to_factory(scope)
  class_name = scope.first.class.name
  class_underscore_name = class_name.underscore.gsub('/', '_')
  f = File.new("#{Rails.root}/spec/factories/#{class_underscore_name}.rb", 'w')
  f.puts "# coding: utf-8"
  f.puts "# Read about factories at https://github.com/thoughtbot/factory_girl"
  f.puts ""
  f.puts "FactoryGirl.define do"
  f.puts "  factory :#{class_underscore_name}, class: \"#{class_name}\" do"
  scope.each do |record|
    f.puts "    factory :#{class_underscore_name}_#{record.id} do"
    record.attributes.reject { |(k, v)|
      k =~ /updated_at|created_at/
    }.each do |(k, v)|
      f.puts "      #{k} #{v.inspect}"
    end
    f.puts "    end"
  end
  f.puts "  end"
  f.puts "end"
  f.close
end