Rails - Sep 2013 - Devise Invitable and Validations -- what's the right way to do this?

Rails 3.2.14, Ruby 1.9.3, devise_invitable 1.1.8

I am trying to get invitations containing custom fields to validate their
contents properly. I have tried the invite_keys hash route, as documented here:
https://github.com/scambra/devise_invitable#model-configuration and unless I am
doing something wrong with my Regexps, what happens is the fields are validated,
but the error messages are incorrect[1].

I also tried adding regular validations on the model, but they aren''t
being called at all (only the built-in e-mail error is handled). When I tried
adding validate_on_invite to my model, I got an error: uninitialized constant
Devise::Models::ValidateOnInvite when I started the application.

Is there an example somewhere showing how to configure the model to validate
custom fields on invitations?

Thanks!

Walter

1. Just to clarify what I mean by error messages are incorrect: If all the
fields are left blank, there is an error on each field saying "[field name]
cannot be blank". That''s as expected. If any of the fields are
properly filled in, then that field is listed in the errors as "[field
name] is invalid", while the missing fields still say "[field name]
cannot be blank". Only if all fields are properly filled in does the form
submit, naturally. I would expect the fields that match their regexp to not have
errors attached at all.

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