Service Objects

Version #1

http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/

class UserAuthenticator
  def initialize(user)
    @user = user
  end

  def authenticate(unencrypted_password)
    return false unless @user

    if BCrypt::Password.new(@user.password_digest) == unencrypted_password
      @user
    else
      false
    end
  end
end

class SessionsController < ApplicationController
  def create
    user = User.where(email: params[:email]).first

    if UserAuthenticator.new(user).authenticate(params[:password])
      self.current_user = user
      redirect_to dashboard_path
    else
      flash[:alert] = "Login failed."
      render "new"
    end
  end
end