I'm trying to do something in a DTML-Method (in ancient Zope 2.6.2)
that seems like it should be really simple, but I can't get it right.

I want to see if a value (defined via url-arg) is in a list which is
generated from an RDBMS query (field type=integer).

The pseudo-code would be something like:

if foo in (select foo_col from table where x=y)
then z='t'
else z='f'

I tried putting the simple SELECT query into a zSql and then calling it like:

<dtml-call "REQUEST.set('foo_list',IfShowNextDoor())">
<dtml-if expr="foo in foo_list">
        <dtml-call "REQUEST.set('z','t')">
<dtml-else>
        <dtml-call "REQUEST.set('z','f')">
</dtml-if>

But that doesn't work.
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