I'm writing an application that uses kivy for GUI and sqlalchemy for ORM. Each has its own instrumentation system, and I initially planned to connect them by 1) mirroring relevant SA attributes in kivy at init, 2) work with only the kivy versions of the attributes for the duration of the app, 3) on write events in kivy, propagate the writes to SA. This works well except when inside SA, changes are propagated through relationships and backrefs. Then I need to reload kivy attributes from their SA mirror parts when such things happen. But I'm having a hard time trying to figure out a way to do this without getting an infinite feedback loop. Particularly, I looked at the AttributeEvents of SA, and the initiator argument seems hopeful, but I'm not familiar with the internals of SA. Does the attribute implementation object have attributes/methods that allows me to prevent the loop? Otherwise, is there an easy way to handle this? Or do I need to get dirty and do something like constructing a child class of both kivy and SA properties?
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