Ghosting as a user

ghosting.rb

# config/routes.rb
resource :ghost, only: [:create, :destroy]

# app/controllers/ghosts_controller.rb
class GhostsController < ApplicationController

    def create
      session[:admin_id] = current_user.id
      user = User.find(params[:user_id])
      sign_in user
      redirect_to root_path, notice: "Now Ghosting as #{user.email}"
    end

    def destroy
      sign_in User.find(session[:admin_id])
      session.delete(:admin_id)
      redirect_to admin_path, notice: "Stopped Ghosting"
    end
  end

# app/controllers/application_controller.rb
def ghosting?
  session[:admin_id].present?
end
helper_method :ghosting?

# app/views/layouts/_header_links.html.erb
<%= render "shared/ghosting_link" if ghosting? %>