id summary reporter owner description type status component version severity resolution keywords cc stage has_patch needs_docs needs_tests needs_better_patch easy ui_ux 17388 Custom model field methods need to handle None, doc should say so anonymous nobody "Wrote a set of custom model fields to handle ASN.1 DER objects encoded as SQL BLOBs (don't ask). One of those custom model fields is used in a model which allows the field defined with that custom model field to be null. Boom, backtrace, bits everywhere. In retrospect it's obvious that if the field is allowed to be null, the .to_python() and .get_prep_value() methods have to support None, but it wasn't obvious up front from the documentation. Not a big deal, the code worked once I figured this out. I'm reporting this in the hope that it might save somebody else a bit of frustration someday. Many thanks for a great package. " Cleanup/optimization closed Documentation 1.3 Normal fixed Accepted 0 0 0 0 1 0