This is not really a bug, but more due to the way Ruby evaluates when
things are executed.
scope :current, where("start <= ? AND expiration > ?", DateTime.now,
DateTime.now)
The code does use the current date/time, but the catch is that it
doesn’t
use the current date/time when the scope is called, but when the model
is
loaded. Meaning, when the console is loaded or the app is started. It
never
updates the date/time used for the scope once it’s loaded.
You’ll want to use a Proc or lambda in this scenario, so the scope
always
uses the current date/time when the scope is called.