```ruby
class ApplicationController < ActionController::Base
  protect_from_forgery
end
```

Set the current user if available
user
```ruby
class ApplicationController < ActionController::Base
  protect_from_forgery
  helper_method :current_user

  private

  def current_user
    @current_user ||= User.find(session[:user_id]) if session[:user_id]
  end
end
```
assistant