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Re: Predicate Builder & Fetched Properties
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Re: Predicate Builder & Fetched Properties


  • Subject: Re: Predicate Builder & Fetched Properties
  • From: mmalcolm crawford <email@hidden>
  • Date: Tue, 5 Jul 2005 11:57:38 -0700


On Jul 5, 2005, at 10:31 AM, Jeff LaMarche wrote:

So I create my smartlist entity, with one attribute (year), and one fetched property that references the People object. I go into the predicate builder and select the birthYear attribute for the left hand side of the equation, and select "=" for the operator. Now, there doesn't appear to be any way to specify an attribute from the smart list entity on the right hand side. I can choose a constant or another attribute from the Person entity. I've tried using using $FETCH_SOURCE but it tells me it can't parse it.


<http://developer.apple.com/documentation/DeveloperTools/Conceptual/ XcodeUserGuide21/Contents/Resources/en.lproj/02_04_design_data_model/ chapter_14_section_4.html#//apple_ref/doc/uid/TP40001871-CH273- DontLinkElementID_70>


see "Right-Hand Side".


Note, though, that a fetched property has at least one distinct limitation as a "smart list" -- it's not dynamic. After the property is fetched, it's cached:


<http://developer.apple.com/documentation/Cocoa/Reference/ CoreData_ObjC/Classes/NSFetchedPropertyDesc.html>

If the values on which the result change (in this case, whether the birthYear is changed because someone made a mistake, or you add or remove People -- should be "Person"?), this is not reflected in the fetched property unless you refresh the source object.

mmalc

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References: 
 >Predicate Builder & Fetched Properties (From: Jeff LaMarche <email@hidden>)

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