EOModel and derived column.
EOModel and derived column.
- Subject: EOModel and derived column.
- From: Theodore Petrosky <email@hidden>
- Date: Tue, 23 Nov 2010 23:37:10 -0800 (PST)
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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