[Rails] Time-dependent values/constants in Models: An issue or not?

Hi there,

I remember reading in the comments of a Rails blog something along these
lines:

"Since a Model is loaded only once in production development (at server
start), certain time-dependent 'constants' that you have placed in a
method of a Model will always return the same value for those
'constants', i.e. the value the 'constant' had at server start."

Hypothetic example for the MySQL 'constant' "UTC_TIMESTAMP()" in a Model
'User':

=====
def books_created_right_now
self.books.find(:all, :conditions => "books.updated_at =
UTC_TIMESTAMP()")
end
=====

Is the above statement utter BS or is there actually some issue similar
to the example or statement?

Thanks a lot!
Tom
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