Refer

Referral codes and affiliate links for Ruby on Rails applications.

Add this line to your application's Gemfile:

gem "refer"

And then execute:

$ bundle

Add Refer to your controllers to store referral cookies:

bin/rails generate refer:install

And add Refer to your model:

bin/rails generate refer:model User
bin/rails db:migrate

Refer adds a model to your Rails application for tracking referrals and referral codes.

To track referrals, you'll need to

1. Create a referral code
2. Set a cookie with the referral code
3. Create the referral
4. (Optional) Provide a reward for successful referral

You can create referral codes through the association:

user.referral_codes.create #=> randomly generated code
user.referral_codes.create(code: "chris")

To customize the referral code generator:

Refer.code_generator = ->(referrer) { [referrer.id, SecureRandom.alphanumeric(8)].join("-") }
#=> generates codes like "1-7frb5fUw"

By default, Refer will generate 8 character alphanumeric codes.

To track users, we need to stash the referral code in a cookie when present. By default, Refer will look for ?ref=code and save this in a cookie.

class ApplicationController < ActionController::Base
  set_referral_cookie
end

Move set_referral_cookie to specific controllers if you'd only like cookies set in certain areas like marketing pages for example.

class MarketingController < ActionController::Base
  set_referral_cookie except: [:about_us]
end

You can customize the param name with:

Refer.param_name = :ref

You can customize the cookie name with:

Refer.cookie_name = :refer_code

To create a referral, you can run the following

class RegistrationsController < ApplicationController
  def create
    @user = User.new(user_params)
    if @user.save
      refer @user #=> Looks up cookie and attempts referral
      redirect_to root_path
    else
      render :new, status: :unprocessable_entity
    end
  end
end

You can also do this manually:

Refer.refer(code: "referral_code", referee: user)

Refer will make sure the user has not already been referred and create a Referral.

Refer.referred?(user)
#=> true/false

To access a user's referrals, you can use the referrals association:

user.referrals #=> [Refer::Referral, Refer::Referral]

This returns a list of Refer::Referral objects.

To access a user's referral, you can use the referral association:

user.referral #=> Refer::Referral

To access a user's referrer, you can use referrer:

user.referrer #=> User that referred this User

To use Refer with Devise, you'll need to customize the Devise controller to track the referral after a successful registration.

We can do this by telling Devise to use a custom controller in the routes and hooking into the create action to track the referral.

# config/routes.rb
devise_for :users, controllers: { registrations: "users/registrations" }

# app/controllers/users/registrations_controller.rb
class Users::RegistrationsController < Devise::RegistrationsController
  def create
    super do
      refer resource if resource.persisted?
    end
  end
end

There are several common ways of handling rewards for successful referrals:

• Immediate rewards When the referral is successfully created, you can immediately credit the referrer with their reward.

• Reward after user actions You can check if a user was referred after they complete the action and provide a reward to the referrer.

• Time-based rewards To provide a reward X days after a successful referral, you can use a schedule job to check for referrals X days ago and provide rewards to those referrers.

We recommend keeping records for each reward given to a referral so you can limit rewards.

If you have an issue you'd like to submit, please do so using the issue tracker in GitHub. In order for us to help you in the best way possible, please be as detailed as you can.

The gem is available as open source under the terms of the MIT License.