Question on manual Core Data migration by the code

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Created Aug ’20

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Hi,

I currently experiment migration by the code. Just for understand what happened under the hood.

It's OK for attributes. But not for relationships.

Here is my code:

Code Block swiftlet property = NSPropertyMapping()
property.name = "list"
property.valueExpression = NSExpression(format: """
FUNCTION($manager, "destinationInstancesForEntityMappingNamed:sourceInstances:" , "ItemV1ToItemV2", $source.list)
""")
item.relationshipMappings = [property]

Thank you for your help 😁

Answered by morininnovation in 629767022

Found the solution myself.

sourceEntityVersionHash and destinationEntityVersionHash are required on NSEntityMapping.

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Answer 1

morininnovation OP

Aug ’20

Accepted Answer

Found the solution myself.

sourceEntityVersionHash and destinationEntityVersionHash are required on NSEntityMapping.

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