Say that I'm modelling a human body. Each body has two arms, and I model them
with the same entity; one has, maybe, setFlipped:YES and the other has
setFlipped:NO. But they are accessed for different purposes; sometimes I want
the left arm and sometimes the right arm. I'd therefore like to set up
relationships thus:
Body_Entity Arm_Entity
leftArm <----> body
rightArm <----> body
But Core Data won't let me do this, because the Arm's 'body' relationship can
only have one inverse relationship. Instead, I must do this:
Body_Entity Arm_Entity
leftArm <----> bodyLeft
rightArm <----> bodyBody
which looks kind of silly, and also in order to access 'body' from an Arm
object I need a silly accessor:
- (Body*)body {
Body* body = [self bodyLeft] ;
if (!body) {
body = [self bodyRight] ;
}
return body ;
}
Is there a better way to model such a thing?
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