Where clause filtering by FilteredTypeResolver column

I want to perform a query filtering the results based on the
attribute/column used as key of the FilteredTypeResolver. But
apparently I can't.

QuestionAnswer references Question, which is the root abstract class
of a hierarchy of questions, and also the root of the
FilteredTypeResolver, using the #qtype and 'qtype' columns.
Each concrete subclass of question implements #qtype.

Ej:
Question
  \__ BooleanQuestion>>#qtype -> "boolean"
  \__ NumericQuestion>>#qtype -> "numeric"
     \__ PercentageQuestion>>#qtype -> "percentage"

... and so on.

I want to perform something like:
query := Query read: QuestionAnswer where: [:each | each question
qtype = NumericQuestion qtype ].

But it seems that because QuestionAnswer references Question (the
abstract class) in its #question mapping/attribute, the #qtype can't
be resolved, because it is a filtering column (which apparently has a
different treatment).

Can this be performed?

Thank you!

Esteban A. Maringolo

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Esteban,

Did you try adding a "normal" mapping for the column qtype?

Joachim

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Answering myself...

I added the following to the Question descriptor, and it works!

((aDescriptor newMapping: DirectMapping) from: #qtype to: (aDescriptor
table fieldNamed: 'qtype'))
beForPseudoVariable

Thanks in advance.


Esteban A. Maringolo

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