Re: Core Recipes question (Migration)

FROM : Andrew Merenbach
DATE : Mon Jul 31 20:47:42 2006

Thanks so much, Ryan.  I hadn't any idea about that--now that I knew 
what to look for, a perusal of the docs quickly turned up the notion 
that I needed to override -managedObjectModel in my persistent 
document subclass.

Appreciatively,
   Andrew

On Jul 31, 2006, at 10:11 AM, Ryan Britton wrote:

> The default model-loading code for the Core Data templates 
> generates a merged model from all of the models found in the app. 
> Unless you've changed this to load a specific model, this is likely 
> the problem you're running into.
>
>
>
> On Jul 31, 2006, at 9:43 AM, Andrew Merenbach wrote:
>

>> Hi, all.  I've a Core Data document-based app that needs document 
>> migration support, and I've found the Core Recipes example 
>> absolutely invaluable.  I have all the parts, as far as I can 
>> tell, fully in place.  I made my own migration framework, linked 
>> it, ran my program, and... nothing.  I get the following error--
>>

>>> Can't merge models with two different entities named 'Record'

>>
>> --where Record is the name of one of my entities.  I have multiple 
>> model files, one for each intended version of my documents; and 
>> unticking the inclusion checkbox in Xcode for all of them (in my 
>> framework) causes my program to run just fine.
>>
>> I'm pretty sure that I understand this much: including two Core 
>> Data model files with any identical entity names would pose a 
>> problem.
>>
>> What I don't get is this: the Core Recipes Migration example also 
>> has a framework (MigrationFramework) that includes multiple model 
>> files, both of which share an identical entity name.  How on earth 
>> can I be able to run the "Migrator" target in the Migration 
>> example, which includes the framework, and not get the same 
>> error?  I'm positive that I've set up my project in the same way.
>>
>> Is there some build-setting checkbox that I'm missing?  Some 
>> inclusion or role setting?  Something?
>>
>> Many thanks, all,
>>     Andrew
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>