Devise, flash message when require_no_authentication + redirect

Could you tell me whats the best practice to include flash messages f.e. "You must be logged out to view the requested site",

when the require_no_authentication-filter is set and the user accesses a site, which becomes filtered. The flash message should appear in every controller where i call the before filter, not only in the device controllers (so inheritance isn't enough)...

Per default there are no flash-messages, which is absurd开发者_如何转开发, from my point of view.

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This behaviour was changed from the device maintainers. You are now able to do that the same way the other hooks become called.