AppEngine Bulkloader generate data during import

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I imported a CSV into the datastore and want to generate a field StringListProperty with a custom action during import (e.g. index generation, doing some calculations). I tried to override the put() method of my model like it is described in question Override save, put, get, etc... methods in Google App Engine, but during bulkloader import this has no effect.

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Khoi On

look into google.appengine.ext.bulkload.bulkloader_wizard, there isn't a default transformer for list of str/unicode. You have to make your own.