auth_helper.rb

module AuthHelper
  def sign_in(user)
    session[:user_id] = user.id
  end

  def sign_out
    session[:user_id] = nil
  end

  def signed_in?
    session[:user_id] && User.find_by_id(session[:user_id])
  end

  def authenticate_user!
    redirect_to new_session_path if !signed_in? || !current_user.admin?
  end

  def authenticate_client!
    redirect_to new_session_path if !signed_in? || current_user.admin?
  end
  
  def current_user
    @current_user ||= User.find(session[:user_id])
  end
end