[Rails] Can i eager-load associations onto an already-loaded object?

Let's say that i have a User object in @user, already loaded. I want
to constantly refer to @user.role on a particular page (where User
belongs_to :role), so i want to 'eager load' the role association.

For the sake of argument, let's say i wasn't able to do this in the
normal way (ie with the :include option to a find call) when i loaded
the user out of the database in the first place, but need to do it
subsequent to that. Is that possible?
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