```ruby
module SessionsHelper
end
```

Add session helper module for quick session changes
user
```ruby
module SessionsHelper
  def current_user
    @current_user ||= User.find_by_id(session[:user_id]) if session[:user_id]
  end

  def logged_in?
    current_user
  end

  def log_in(user)
    session[:user_id] = user.id
  end

  def log_out
    session.delete(:user_id)
    current_user = nil
  end
end
```
assistant