In come back to the problem addressed in dabo-users that in order to
make the step-by-step guide work, you need to explicitly set
self.NonUpdateFields = ["clientname"], although dabo should be able to
recognize that clientname is not a field of that table automatically.
I have just analyzed this a bit. The problem is that the default
NonUpdateFields are determined in dCursorMixin like this:
self.__nonUpdateFields = [f[0] for f in self.DataStructure
if (f[3] != self.Table) or not f[4]]
But in _getDataStructure f[3] is always set as self.Table, even for
fields which do not belong to the table; there is this comment:
# Get the information from the backend. Note that elements 3 and 4 get
# guessed-at values.
So I think the root cause is that these fields are only guessed at and
not determined exactly. I think dabo should at least check whether the
field exists in self.Table and set f[3] and f[4] to None otherwise.
The fields of the table could be requested in _getDataStructure as
self.BackendObject.getFields(self.Table, self).
Does this make sense? I don't yet understand the inner workings of dabo
well enough to propose a proper fix.
-- Christoph
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