```ruby
class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception
end
```

Add helper for requiring a login
user
```ruby
class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception

  protected

  def require_login
    unless logged_in?
      flash[:error] = "You must be logged in to access this section."
      redirect_to login_path
    end
  end
end
```
assistant