Best way to update relationships on fetch
Best way to update relationships on fetch
- Subject: Best way to update relationships on fetch
- From: Ray Ackland <email@hidden>
- Date: Sun, 12 Oct 2003 11:44:17 +1300
Sorry the title couldn't be more descriptive :)
I am working with two tables - people (who have a dob) and age
groupings. The idea is to classify people into different tiers based on
their age, and report on the numbers of people in each group.
The problem I am faced with is how to update the relationship between
the individual people and the category they fit into. I need to update
the relationships as I am preparing the report (not when the people are
added to the database) because the user will have the ability to alter
the age ranges for each group, not to mention people moving from one
group to the next as they age.
One possibility I have imagined is using the awake from fetch to
check/correct the ageGroupID (foreign key) as each person is loaded. I
believe the problem with this is that the fetch has already happened,
and the relationship would need to be invalidated and re-fetched before
the report can be created. Would this cause a loop? Can I just
invalidate the relationships to achieve this? Is this re-faulting?
As frustrating as all this is, I must admit that there is some
enjoyment to adding a little bit more knowledge to my WO understanding
each time I overcome another obstacle (as Steve Jobs said - "5% down,
95% to go").
Ray.
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