Hi everybody
Here, a CoreData novice, stumped at a fairly simple issue, a bit under-
documented by apple (Apple under-documenting? uh?).
If anyone can give me a hint, I'll be much in debt.
Well, the thing is about $FETCH_SOURCE and a Fetched property in Core
Data.
I create two entities (xA and xB), and I want one of them to be linked
as a fetched property of the other (xB has the fetched propery fXA).
In the model builder, I create a fetched property with the type/
destination of the other (fXA is of type xA). One of them has an
indexed number property (xA has xAitemId property, indexed), so fXA
should have a predicate containing xAitemId. Then xB has a property
that refers to xA: it should find its matching xA by looking at
itself, as it contains a property xAitemIdinXB, with the same format
as xAitemId and it is known that xAitemIdinB has a corresponding
xAitemId, existing at least one xA managed object instance with
xAitemId = xAitemIdinB.
Well, as far as I know, the fetched property of destination xA called
fXA built in xB shoul contain the predicate (Expression):
xAitemId == $FETCH_SOURCE.xAitemIdinB
Not even writing the referral directly: xAitemId = 435345. The object
NSLog always lists the property fXA in a xB instance as
fXA = "<relationship fault: 0x1dce50 'fXA'>";
Am I wrong at the predicates?
Thanks for reading, everyone.
Regards,
Jose
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