On Dec 26, 2007, at 1:09 PM, Adrian Klaver wrote:
> If my outline above is remotely correct the relationship between
> the Dabo.biz
> and Dabo.ui layer is one sided. In other words the ui layer does
> most of the
> work by pulling and pushing data from and to the biz layer. This is
> where my
> understanding fell down.
It is no more one-sided than the relationship between the bizobj
layer and the database layer: the bizobj pulls and pushes from/to
that layer just as the UI does with the bizobj.
Bizobjs exist without any knowledge of UIs. The same bizobj can work
with a wxPython UI, a web interface, a command line program, etc.
They simply expose a few methods and properties, and return the
desired information.
> Obviously I misinterpreted the information presented on
> the Dabo home page as ascribing more power to bizobjs with regard
> to interacting
> with the ui layer then is the case.
>
> "Business Rules
> This tier is where all the business logic resides. You simply
> subclass dBizobj,
> set a few properties, and override a few methods. The dBizobj
> communicates with
> the database tier and the user interface tier, and enforces your
> business rules
> to your specifications.
I don't see anything incorrect or misleading there. Can you be more
specific about what you find confusing or misleading?
> User Interface
> You create your forms by laying out various controls or widgets,
> and setting
> properties to tell Dabo what bizobj and what field in the dataset
> the control
> represents. There is no business logic at this level, and only
> minimal code will
> be entered here: it is mostly laying out your UI design and setting
> properties
> to tell Dabo how to connect to the business rules. "
Again, that is exactly how programming should work in Dabo.
> I would like to ask that the documentation for the form versions of
> save() and
> requery() be changed to reflect that they do more then simply ask
> the bizobj to
> carry out the same operation.
Could you suggest alternate wording for the docstrings in question?
-- Ed Leafe
-- http://leafe.com
-- http://dabodev.com
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