I am using inheritance in the model as well as interfaces but the
problem isn't the inheritance! I'm having a hard time explaining the
structure of my application so I've done my first-ever UML Class
Diagram to try to explain it better. I've attached it - hopefully it
makes it.
I don't think I'm doing anything crazy. I think it is pretty standard
OO stuff (straight out of Head First Design Patterns). Can anyone
tell me a better structure?
Dave
On Apr 27, 2006, at 6:10 PM, Ken Anderson wrote:
Inheritance can vastly improve the features of EOF if used
properly. In general, I usually make all super-entities abstract,
and have a different table for each leaf. However, if your data is
all the same and you just need inheritance for different behavior
in code, I typically use a single table and use well defined
qualifiers for the entities. A while ago (after much complaining),
the EOF engineers worked out a way to not do queries for all the
sub-entities if you're entity qualifier was straightforward like:
"type = 'A'". I highly suggest sticking with this for performance
reasons.
Ken
On Apr 27, 2006, at 1:00 PM, Chuck Hill wrote:
On Apr 27, 2006, at 1:13 AM, Paul Lynch wrote:
You may want to use entity inheritance to design your model; see
http://developer.apple.com/documentation/WebObjects/
UsingEOModeler/7ModelingInheritance/chapter_7_section_1.html
The only thing I'll add is that, from experience, most of the
times that using inheritance is possible, I choose to flatten out
the model instead. Other people may have different experiences.
From the OO viewpoint, a complex design has the same problems as
overnormalisation has in relational database design.
On the other side of this fence, I use inheritance whenever it
makes sense in the OO view. I have found that this greatly
simplifies many aspects of the application.
Chuck
--
Coming in late 2006 - an introduction to web applications using
WebObjects and Xcode http://www.global-village.net/wointro
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve
specific problems. http://www.global-village.net/products/
practical_webobjects
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