Mapping Model
Mapping Model
- Subject: Mapping Model
- From: Amy Heavey <email@hidden>
- Date: Mon, 23 Aug 2010 18:06:07 +0100
Hi,
I've got a core data app that I'm working on, and I started off with
quite simple relationships. I've got a products entity, and a purchase
order entity, which had many to m any relationships between them. I
now need to be able to set a quantity for each product in each
purchase order. I think I need to set up an inbetween entity, (called
purchaseOrderItem) which stores the quantity for each product, and has
relationships to the product and purchase order entity.
I can set it all up in the datamodel, but to be able to use the data
already in the app I need to migrate it over. I expect to initially
set all quantites to 1, but I can't work out how to set up the mapping
model so it moves the relationships correctly.
Can anyone point me in the right direction?
data model 1.0
Entities: Product, PurchaseOrder
Relationships: Product <<---->>PurchaseOrder
data model 1.1
Entities: Product, PurchaseOrder, PurchaseOrderItem
Relationships: Product <---->> PurchaseOrderItem
PurchaseOrderItem <<----> PurchaseOrder
Many Thanks
Amy
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