ruby - class_eval and open classes -

i using spree, , spree has class called order looks like:

module spree   class order     # class definition.   end end

in own app, have been customising order so:

spree::order.class_eval   # customisations end

my question is, can this:

module spree   class order     # own customisations.   end end

any downsides this? essentially, want avoid using class_eval.

benjamin, reopen class not inform (but class_eval raise error) if existing class not exist or not loaded.

but if have test coverage, reopen class should safe guess?

And