Read-Only Core Data Attributes
Read-Only Core Data Attributes
- Subject: Read-Only Core Data Attributes
- From: Jonathon Mah <email@hidden>
- Date: Thu, 4 May 2006 17:34:58 +0930
I'm making a wiki-like application with Core Data. (It will be open-
sourced when it's more ready.) The application stores past revisions
of entries. Each revision has an 'isProvisional' attribute; this is
YES on creation, and stays YES until -commitRevision is called.
The attributes of each revision can only be changed while
isProvisional is YES; this prevents changing past revisions. My
question is, how should I enforce that attributes of non-provisional
revisions be read-only?
My ideas:
1. Implement validation methods that return NO (unless the new value
is equal to the current one).
2. Throw an exception in setter methods if the revision is read-only.
3. "Accept" setter messages, but simply ignore them (keep the
attributes unchanged).
Which is the best way to enforce read-only attributes? I'm leaning
toward using both 1 and 2 above.
Thanks,
Jonathon Mah
email@hidden
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