Data modeling, inheritance, and relationships
Data modeling, inheritance, and relationships
- Subject: Data modeling, inheritance, and relationships
- From: Timothy Larkin <email@hidden>
- Date: Sun, 20 Nov 2005 09:13:23 -0500
Suppose I have an entity class, Field, which has a relationship,
foo. Then I create another entity class, Subfield, which is a
subclass of Field. I expect that Subfield will inherit the foo
relationship as well as the other attributes of Field. However, I
have not been able to find any way in the XCode data modeler to
attach Subfield to another entity using the foo relationship. If I
create a relationship, foo, for Subfield, the data modeler compiler
complains that Subfield.foo conflicts with Field.foo.
Or is it the case that Subfield inherits the destination entity along
with the relationship itself? Can Subfield direct the inherited
relationship foo to an entity other than the destination entity of
that relationship in the superclass, Field?
--
Timothy Larkin
Abstract Tools
Caroline, NY
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