Re: Core Data merging
Re: Core Data merging
- Subject: Re: Core Data merging
- From: Tim Isted <email@hidden>
- Date: Fri, 15 Aug 2008 11:09:18 +0100
On 15 Aug 2008, at 00:19, Vadim Lozko wrote:
I'm having a problem trying to upgrade an existing store of a Core
Data database to a newer model that simply has 1 additional
attribute property in an entity. This is not a document based app.
Also, not sure if this is significant, but the xcdatamodel and all
related files are stored in a framework.
[...]
I tried to go about this two different ways. One was was to include
only the newer model file and the mapping file to the build.
However, the error I get is:
Error while adding persistent store: Error Domain=NSCocoaErrorDomain
Code=134140 UserInfo=0x3c9030 "Persistent store migration failed,
missing mapping model."
You do need to have the relevant data models inside your project,
normally stored inside a datamodel bundle...
However, when I include all three files (both model and the
mapping), it seems like it's trying to merge the two and ignore the
mapping file altogether. The error I get is:
*** Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: 'Can't merge models with two
different entities named 'SomePrivateEntityName''
This particular problem is normally reasonably easy to fix.
Are you storing your data models in a data model bundle
(filename.datamodeld)? You can then specify in Xcode which one is the
current version. Assuming this is done, make sure that only one of
your data models (the current version) has its target checkbox ticked,
but don't tick any of the others. Sometimes you need to un-tick them
all and re-tick them, or occasionally I've had to clean a project to
get Xcode to accept and obey different ticks. If you have two data
models (usually inside a bundle) included in the target and they have
some or all of the same entity names inside, you will get this error
if both models are being included in the target app.
HTH,
Tim
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