save it in the session hash on validation and delete it from the session
hash after the save.
if validations fails, try to find the value on the session and putting it in
the controller. Since validation will trigger again
in a second submit, also look for the value in the session hash before
setting a new one.
validate do |applicant|
applicant.check_things
if session[:mysterous_object].nil?
applicant.non_represented_field = session[:mysterous_object] =
123456789
else
applicant.non_represented_field = session[:mysterous_object]
end
end
then on an after save
session[:mysterous_object] = nil
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