Add custom fields to payload AFTER action is called #24
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Imagine we want to log the user id or some session variables, this will be called before any before_filter, including the rails before filter that handles csrf.
This can be bad, for example, devise memoizes the current resource, this means that if we want to add
current_user.id
to the custom fields, it will be computed before rails can nullify the session (default behaviour), meaning that CSRF protection will be completely bypassed.