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From: "Markus Ruggiero (rucotec)" <markus.ruggiero@rucotec.ch>
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Subject: Ideas for arbitrary to-one associations
Message-Id: <264B371C-231B-451D-B6F9-6A6BD5D28398@rucotec.ch>
Date: Mon, 15 Jan 2024 13:45:45 +0100
To: WebObjects & WOnder Development <webobjects-dev@wocommunity.org>


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I am looking for ideas / strategies to implement the following =
requirement:

I want to implement something I call GeneralNote. It should be possible =
to create such a note anywhere in the application and associate it with =
the current EO, whatever this may be. Thus any EO can potentially have 0 =
to many GeneralNote objects hanging off it. One GeneralNote however is =
not shared, thus it is a real to-one relationship from GeneralNote to an =
EO.
It is obviously not possible (well, more like totally impractical) to =
model a to-one relationship from GeneralNote to any/all possible =
destination entities in my EOModel.

Any ideas on how to do this? I want to leverage as much as possible the =
power of EOF. I was experimenting with code that puts the destination =
entity and the destination object=E2=80=99s primary key value in =
attributes of GeneralNote. I also have code that can find GlobalNote =
objects for an EO by using its entity name and primary key for fetching. =
All our EOs share a common base class that can easily accommodate such =
code generically. But what if the EO and a note is created at the same =
time? There is no primary key value yet! And how can I prevent an EO =
from being deleted and leaving orphaned notes behind? Would overriding =
willDelete() be a good place to also delete the notes? What about not =
allowing EO deletion when there still are notes?

Thanks for any ideas!
---markus---


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