Best method to observe an entity?
Best method to observe an entity?
- Subject: Best method to observe an entity?
- From: Mitch Tishmack <email@hidden>
- Date: Sun, 10 Jul 2005 20:53:41 -0500
Hi everyone,
I have a simple question regarding core data. I have 3 related
entities. One is a simple list of items. The other is a simple tuple
list of those related items. And the third is a list of the items as
a pair with source and target.
The tuple has a many<->many relationship to the items, and the pairs
are just a many pairs<->to one item. The caveat is that I am keeping
a source/target of each item.
If I were to implement this in a database, normally I would just make
a trigger on the tuple entity and build what I want into the third
table. But I noted in the core data docs that kvo observing is
disabled under core data.
Which leaves me 3 methods of adding the data I want into the pair
entity.
1. Use a controller to add data to the tuple entity and then add any
needed entries into the pair entity.
2. Implement my own accessor methods so I can get kvo notifications
on the tuple list.
3. Ask anyone here if there is a way to get kvo observing on an
entity so I don't need the controller.
Personally I like the controller method, but I thought I would ask
everyone here how they might go about implementing this. This is my
first real core data app and I haven't found much information on the
preferred method to manage 2 related entities that depend upon
updates to the other. Curious what everyone else would do.
Cheers,
Mitch
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