iOS Core Data - Double to Decimal Migration Issue -

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i have gone through data model , have converted number of properties double decimal. trying default migration process, , continue error: "can't find mapping model migration".

i have used mapping models in past, , been able lightweight migration using them, have typically had structure changes.

this first time, doing conversion of 1 type: nsnumber type: nsdecimalnumber.

reading docs, seems need use subclasses of nsentitymigrationpolicy, have created. still getting same error not finding mapping model.

are there gotchas i'm not seeing keeping column name same, , changing type of value prevents mapping model getting found?


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