Merging Core Data models from plugins
Merging Core Data models from plugins
- Subject: Merging Core Data models from plugins
- From: Daniel Price <email@hidden>
- Date: Sun, 6 Jan 2008 20:06:45 +0000
I have a Core Data app that I would like to extend via plugin (ie
bundles). Each plugin would contain it's own xcdatamodel file to be
merged with the applications Data Model at startup. My app defined an
entity called 'Shape' which is abstract. The first plugin defines an
entity called 'Circle' with a duplicate copy of the 'Shape' entity set
as it's parent. I have second plugin with an entity called 'Square' etc.
Im testing with using the Core Data App template. My understanding is
that when [mergedModelFromBundles] is called, is ignores entities of
the same name when they're identical so what I should end up with at
runtime is a single Data Model with 'Shape' and it's too 'child'
entities from the plugins; Circle and Square.
For this to be effective, the Circle and Square data models cannot
include any other entity that 'Shape' (ie. they are independent) and I
can get this to work with one plugin, but not two.
If I have two plugins loaded, the app freezes at startup. I CAN get it
work as expected if I include the entire hierarchy in the plugin
models - that is 'Square' has a copy definition of 'Circle' and vice-
versa, but that breaks the objective.
Any ideas what I'm doing wrong? I don't get any errors in the console
and I've tried a clean and deleting the .xml store under Application
Support. I've not been able to find any examples of this. There is no
other code in my test app other than what is provided by the template
and each Entity used the NSManagedObject.
Any help appreciated!
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