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class UsersController < ApplicationController

  # ...

  def create
    Services.user_service.create_user user_params    
    redirect_to action: 'index'
  end

  # ...

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# config/initializers/services.rb

require 'barrister-rails'

class Services

  def self.user_service
    @@services ||= proxy_services
    @@services[:user_service]
  end

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# services/user_service/models/user.rb

class UserService

  class User < ActiveRecord::Base
    validates :email, uniqueness: true
  end

end

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# services/user_service/implementation.rb

class UserService

  USER_ATTRIBUTES = %w(id full_name email phone_number)
  
  def initialize(mail_service)
    @mail_service = mail_service
  end
  

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# services/mail_service/implementation.rb

class MailService

  def send_email(from, to, subject, body)
    opts = { from: from, to: to, subject: subject, body: body }
    mail = ActionMailer::Base.mail opts
    !!mail.deliver # return true if we're g2g
  end

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// services/user_service/interface.idl

struct UserProperties {
  email        string
  full_name    string
  phone_number string [optional]
}

struct User extends UserProperties {
  id           int

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// services/mail_service/interface.idl

interface MailService {
  send_email(from string, to string, subject string, body string) bool
}

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class UsersController < ApplicationController

  def index
    @users = User.all
  end

  def new; end

  def create
    User.new(user_params).save!

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class User < ActiveRecord::Base
  after_create :notify_added
  validates :email, uniqueness: true
 
  def notify_added
    UserMailer.email(self).deliver
  end
end

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class User < ActiveRecord::Base
  after_create :notify_added
  validates :email, uniqueness: true
 
  def notify_added
    UserMailer.email(self).deliver
  end
end