Certain test runners (in my case, Django's RemoteTestRunner) pickle the exceptions raised to accumulate them from multiple processes.
For exceptions with AttributeValidationNote and/or IterableValidationNote attached, because we have overridden __new__ on these classes, pickle cannot correctly unpickle them with the required arguments. For this use case, exceptions being pickable is necessary to accumulate errors with the multiprocessing setup.
Tinche
commented
1 year ago
Certain test runners (in my case, Django's
RemoteTestRunner) pickle the exceptions raised to accumulate them from multiple processes.For exceptions with
AttributeValidationNoteand/orIterableValidationNoteattached, because we have overridden__new__on these classes, pickle cannot correctly unpickle them with the required arguments. For this use case, exceptions being pickable is necessary to accumulate errors with themultiprocessingsetup.This implements
__getnewargs__to fix this problem.