[Seaside] Lists and ownership
rbb at techgame.net
Mon Nov 1 19:28:55 CET 2004
Quoting Jim Menard <jimm at io.com>:
> I have a list of things (an address book), and I'm writing a simple Seaside
> app to display the list and CRUD entries. I have a bunch of basic, related
> design questions. Any help will be greatly appreciated. There are a lot of
> questions here; answers like "go read XXX" would be just as helpful as direct
> answers. I have read the few Seaside tutorials and docs I've been able to
> Who should "own" the list of entries? Should I create the list as a class
> instance variable of the entry class, or as a global entry in Smalltalk?
A pattern I have used in the past is to create a class the represents my data,
like the Entries class you mention. I'll put a class side variable that will
hold the data, and make accessor methods to get at the data:
Entries list do: [blah...]
then in my Seaside session, I would create an accessor that hides that:
^ Entries list
so in the rest of the app you are doing things like:
self session entries add: anEntry
Later, you can switch to using a GOODS database or some other db to store your
entries, and as long as you protocal for adding and deleting entries doesn't
change, your web app won't have to change a whole lot.
For example, if you have:
you can hide whether it's implemented as a simple Collection or as something else.
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