Thanks David, that is extremely helpful and thanks for all of your time.
On Feb 16, 2007, at 11:24 AM, David Holt wrote:
Hi Bruce,
I don't have the time to continue exploring this with you today,
but to answer your question, I have used detail data sources when
passing an object from one component to the next. For example, you
can select an object from a displayGroup on one page and set it as
the master object of a master/detail displayGroup on the following
page. If you don't have the detail data source, you don't see the
binding for masterObject in WOBuilder. In truth, I expect that
following the paths to the attribute you want to display as I
showed in the example yesterday makes the Master/Detail
configuration unnecessary.
Having said that, my guess is that the tutorial would have worked
fine with a normal to-many relationship. The example in the
tutorial contains a model that is more complicated than I usually
use because of the accessible attribute "roleName" in the join
entity MovieRole (normally I would just have the two foreign keys
in the join table and leave it as an artifact in the database).
Having MovieRole as an object arbitrarily seems to change the
Entity type of your WODisplayGroup as you select different Master
and Detail entities. I haven't seen this behaviour before and it
doesn't seem to be logical.
As an experiment, you could try and make a simple EOModel with
Teacher and Class entities and see if the tutorial example works
for that.
Teacher {id, firstName, lastName}
Class {id, subject, fk_teacher_id}
to-many Teacher to Classes
You could try dragging the classes relationship to the WOComponent
in WOBuilder (which should create a classesDisplayGroup) and go
from there...
David
On 16 Feb 2007, at 6:39 AM, Bruce Smith wrote:
what exactly is "Has detail data source" for?
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