Re: Core Data and unique IDs
Re: Core Data and unique IDs
- Subject: Re: Core Data and unique IDs
- From: Óscar Morales Vivó <email@hidden>
- Date: Sun, 30 Jul 2006 00:23:49 -0400
IIRC Core data objects already have a private UID set, used
internally. I wouldn't recommend using it though.
On Jul 30, 2006, at 00:09 , email@hidden wrote:
Stefan wrote:
Do we have a unique ID property for entities?
Although I currently don't need it, I wonder how I could move an
entity from
system A to system B using DO. My idea would be to add a globally
unique system ID
to each system and add this system ID to each entity. Each entity,
which moves from system A
to system B would know, if it is locally maintained or copy from a
remote destination.
Well, not really importent. Does a best practice exist?
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Just make a common super entity that has a uuid field that holds a
string value.
In the awakeFromInsert method, set the value of the uuid field
using CFUUID and its string uuid method.
It will then persist in all sub entities (and as long as they
subclass from that class)
You can then use it sort of like a globally unique-primary key of
sorts.
Its very useful in my opinion.
Andre
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