use attrs pkg for orms

[goodboy]

Issue by tgoodlet
Thursday Sep 22, 2016 at 02:03 GMT
Originally opened as sangoma/sandswitches#2

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For the object mapper's parent we have state passed around through the kwargs class attribute which end up getting copied to new instances in a pretty ugly way.

We should instead try using attrs to see if a lot of the boilerplate "state copying" can be simplified when generating new child elements.