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Re: Core Data Questions
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Re: Core Data Questions


  • Subject: Re: Core Data Questions
  • From: Gordon Apple <email@hidden>
  • Date: Fri, 06 Jun 2008 19:06:48 -0500

    Our data hierarchy has six objects, all of which inherit from "BaseList"
which contains a dictionary (props) and an array (subList).  These lists are
chained (i.e., the six subclasses).  So in the first-attempt data model,
baselist.sublist is a one-to-many looping back to BaseList.

    However, the last item in the chain (Layer) needs it's subList to point
to shapes  instead of BaseList,  i.e., subList is now a draw list.  I could
move subList into the subclasses, but there is a lot of recursive stuff
going on in BaseList where it needs to be.  Maybe I could just override an
accessor so BaseList can get to it.  Apparently, there's an issue calling
"super" in managed objects, so I'll have to see if that poses any problems.

> On Fri, Jun 6, 2008 at 6:59 PM, Gordon Apple <email@hidden> wrote:
>>    I'm currently trying to evaluate whether or not Core Data is a viable
>> storage system in our application.  Although I've been through the
>> tutorials, Refs, and searches, I still have questions:
>>
>> 1.  Our data hierarchy model does not seem to fit into the Core Data object
>> model.  (At least I haven't been able to make it fit so far).  Now what?
>> Redo the data model?
>
> This seems unlikely. Can you provide some more information on your
> model? You may simply be looking at Core Data the wrong way.
>

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