I am reading the Red Webobject 5.0 book and I think I finally understand the
small section on creating an attribute the is derived.
(I am using postgresql as the backend)
so my User entity has a firstName and a lastName. I created an attribute called
'theFullName' as derived "firstName || ' ' || lastName", in the advanced tab, I
choose "Read Only".
i assumed that would be enough, however I needed to also select 'allows null'
in the basic tab. if I didn't, User.createUser(yada, yada); required a
'theFullName' attribute.
My assumption was that as the column is derived and read only, I thought the
column was special and shouldn't need the 'allows null' selection.
so, did I do it correctly?
as the column is a derived column and read only, why do I need to add 'allows
null'?
I have been creating all these derivatives in java in my User.java file, but I
thought I would expand my understanding and play with some features.
now on to stored proceedures.
Ted
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