Linking to derived columns in EO Models
Linking to derived columns in EO Models
- Subject: Linking to derived columns in EO Models
- From: Ray Ackland <email@hidden>
- Date: Thu, 17 Jul 2003 21:33:57 +1200
Is there a way of having derived columns at the end of a link?
I am trying to devise a (probably common) method of letting people
select from categories - in this case they
a) select the main grouping (eg 200), which gives them a list of
choices (210, 220, 230...)
b) select from the next group (eg 220) which gives them further choices
(221, 224, 225...)
c) select the final candidate from this list.
I was attempting to do it by having a derived column (levelOneCode =
code / 100... etc) which links back to the same table to look up the
description of the main group. Conversely, you select a main group and
the records linked to it are shown. But when I do this, I am unable to
use this column as a foreign key.
Any suggestions?
Ray.
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