Core Data vector modeling query
Core Data vector modeling query
- Subject: Core Data vector modeling query
- From: Paul Tomlin <email@hidden>
- Date: Mon, 1 Dec 2008 11:23:30 +0200
Using an analogy, I'm trying to model a 'vector' using CD. I have a
Vector entity, which has 2 to-one relationships to a VectorEnpoint
entity. The VectorEndpoint entity describes how the Vector is
connected at one end to other entities in the model
Vector:
source -> to-one -> VectorEndpoint
target -> to-one -> VectorEndpoint
I need a VectorEndpoint entity because the definition of the 'end' of
each vector is not straightforward.
My query is how should I model the inverse of these 'source' and
'target' relationships?
VectorEndpoint:
vector -> to-one -> Vector
simply doesn't work because the Vector entity has 2 relationships
which ideally need inverses (I can only choose 'source' or 'target' as
the inverse).
One possible solution I can think of involves having different
entities for each end. I'm pondering if this is going to be a suitable
solution for my task. It does seem a little wrong, intuitively at least.
AbstractVectorEndpoint:
(abstract + common data)
VectorSourceEndpoint:
vector -> to-one -> Vector (source)
VectorTargetEndpoint:
vector -> to-one -> Vector (target)
Any thoughts or pointers?
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