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re: CoreData _PK NSManagedObject

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re: CoreData _PK NSManagedObject

Subject: re: CoreData _PK NSManagedObject
From: Ben Trumbull <email@hidden>
Date: Wed, 17 Sep 2008 14:02:51 -0700

does somebody know a way to retrieve a NSManagedObject (whose db has
already been saved) if I know its _PK in sqlite ?

[snip]


The result gives me the Z_PK of objects. This Z_PK is the index in the
db.
NSManagedObject does not accept "_PK" key.

<nice> Please leave the Z_PK alone. It is not the column you are looking for. </nice>

This is unsupported with extreme prejudice.  Extreme.  Prejudice.

You really ought to file a bug report for group by queries. Nobody has asked for them, hence no feature.

Working within the public API, there is nothing stopping you from creating your own unique ID field, like a UUID, and retrieving the results with an IN query against your attribute.

- Ben

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