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As per How to refactor a core data model to make two existing entities inherit from a new abstract entity, I am trying to create a mapping model that maps two children entities to their newly created parent entity.

I can add the "copy" mappings from the old to new versions of the same entities (i.e. EntryToEntry), but when I try to create a new mapping ChildToParent, I am unable to define the destination attributes:

Mappings editor with problem shown

I have added the source and destination Entities to the Mapping. Where did I go wrong?

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eLillie
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  • I would recommend avoiding parent-child entities in core data I have found that they don't work very well and are not worth the trouble. – Jon Rose Feb 23 '17 at 07:48
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    @jon Can you elaborate on what you mean by "they don't work very well and are not worth the trouble", or point me towards a resource that does? – eLillie Feb 23 '17 at 17:28

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