Re: Fetching from related object
Re: Fetching from related object
- Subject: Re: Fetching from related object
- From: Arturo Pérez <email@hidden>
- Date: Sat, 24 Apr 2004 22:46:05 -0400
On Apr 24, 2004, at 9:56 PM, Randall Perry wrote:
On Apr 23, 2004, at 6:54 PM, Randall Perry wrote:
So, you fetch a CustInfo as above. Now, how do you get the Log
objects
associated with it? The easiest best performing way is to do
NSArray arrayOfLog = (NSArray)custInfo.valueForKey("logEntries");
Is it possible to use a filter with this method? I only want log
records for
the past year.
You can use the qualifierWithQualifierFormat and
filteredArrayWithQualifier to filter it in memory. Obviously, at some
point a performance issue will crop up. It would only be an issue if a
user has thousands of Log entries associated with it. At that point I
would my preference is to use model-based fetch specifications.
For my latest thing what I did was make a database view. I didn't want
to have to filter every time I used the relationship.
Notice that there is no fetch specification involved. EOF takes care
of it all for you. The SELECT, the join the whole nine yards.
Pretty nifty.
Yep, by far the most important reason to use WO/EOF. One of the
products I had the pleasure of helping create with WO/EOF couldn't be
done with any other tool in the timeframe necessary (they tried). And
it was because of this sort of thing.
----
WO in philadelphia - wanna cheesesteak with that?
Please visit http://webobjects.meetup.com/.
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