s = datetime.date(2020,1,1)
subquery = db(db.unavailable.the_date==s)._select(db.unavailable.who) # 
notice _select
db(~db.members.id.belongs(subquery)).select(db.members.ALL)

On Sunday, 15 September 2019 12:20:45 UTC-7, backseat wrote:
>
> I have a list of members that I want to schedule for certain duties. One 
> table lists the people:
>
> db.define_table(
>     'members',
>     Field('fullname', type='string', label='Name'),
>     [...]
> )
>
> I select members from that table according to certain criteria, but I want 
> to not select them if they are unavailable on a given date.
>
> I have:
>
> db.define_table(
>     'unavailable',
>     Field('the_date', type='date', label='Date'),
>     Field('who', type='reference members', label='Name')
> )
>
> It is possible, given a date and the other selection criteria, to get a 
> list of available members for the date in question?
>

-- 
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