Re: Flattened relationship and iterator oddness
Re: Flattened relationship and iterator oddness
- Subject: Re: Flattened relationship and iterator oddness
- From: Christian Pekeler <email@hidden>
- Date: Wed, 20 Sep 2006 10:57:38 -0600
I have a similar problem trying to use a flattened relationship in my
WOUnitTesting.
I have this:
Study <->> StudyPeriod <->> StudySchedule
My flattened relationship periodSchedules is defined in my EOModel for
Entity Study as studyPeriods.studySchedules named "studySchedules".
I don't think it makes sense to flatten across more than one to-many
relationship. Asking a study for it's studySchedules would give you
an array of arrays of studySchedules (I think).
I create the study, its periods and the periods' schedules using
WOUTMockEditingContext and the createSavedObject and
addRelationshipToBothSides... methods. All works fine when I
enumerated over the realtionships. It passes all of my tests for
custom methods I have. However, whenever accessing my flattened
relationship ("studySchedules"), rather than enumerating over the
to-many relationships, the result is always an empty array.
I am not sure if this is related to the faulting of flattenen
relationships or something specific with using the
WOUTMockEditingContext (not the newest version WOUT2)
You'll get the same result when using an EOEditingContext, so I don't
think your problem is related to using the MockEC. Sorry, I don't
know what the solution is. I've read in some of Apple's old docs
that: "flattening is a technique you should only use under certain
conditions. Instead of flattening an attribute or a relationship, you
can instead directly traverse the object graph, either
programmatically or by using key paths. This ensures that your
application has an internally consistent view of the data." I only
use flattening on many-to-many relationships to bypass the join-
entity, which works fine.
Christian
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