fix: Shallow copy group_entities and person_entity when cloning TBS #294
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Temporarily moving to draft; I think we can actually re-enable the two tests removed previously, but want to confirm |
nikhilwoodruff
approved these changes
Oct 17, 2024
This was referenced Apr 14, 2025
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Fixes #293.
Previous fixes to
-coreensured that when a TaxBenefitSystem object was cloned via its internal.clone()method, entities themselves were shallow copied to prevent stale variable versions from being transferred between systems. However, this fix assumed thatGroupEntityandPopulationEntityobjects were included within theTaxBenefitySystem'sentitieskey, when they are not.This led structural reform runs to crash, as the
GroupEntityandPopulationEntitywould possess stale variable versions from the API's first instantiation of the default tax-benefit system, attempt to calculate using this, then crash when they couldn't find a variable that had been newly created as part of a structural reform.This PR ensures that
GroupEntityandPopulationEntityobjects are also shallow-copied to prevent this behavior. This PR does not add tests at the moment, but I have opened an issue in the-apipackage laying out a comprehensive series of tests around structural reforms at PolicyEngine/policyengine-api#1885. I have also opened a draft PR in the-uspackage to ensure these changes cause no test failures there (PolicyEngine/policyengine-us#5240).