Fix building mappings in snapshot mode when parent has no mappings - #1618
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In the case that an originalMapping is empty ([]), it might get cleaned and deleted. Usually this is ok, but when building snapshots, we reference it to build the mapping, so we need to treat an undefined originalMapping like [] if that occasion arises. Fixes #1616
jduteau
approved these changes
Apr 15, 2026
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Description: If a parent SD has no mappings, then
StructureDefinition.originalMappingwill be empty (e.g.,[]). During export, SDs are "cleaned" and properties that are empty arrays are deleted (since empty arrays are not allowed in FHIR). WhenoriginalMappingwas deleted, however, the code that builds the mappings in snapshot mode crashes trying to dereferenceoriginalMapping. Now an undefinedoriginalMappingwill be treated as an empty array (which is what it was before cleaning).Testing Instructions: You can reproduce this using the project from #1616:
On
masterit will crash but on this PR branch the build will succeed.Related Issue: #1616