Thanks Anthony. It almost works (but it fails in an odd way). I was getting
some odd results, and I've narrowed it down to this:
In [10]: task_duration = (db.t_periods.f_end - db.t_periods.f_start)
In [11]: results = db(query).select(p.id, p.f_start, p.f_end, task_duration
).as_list()
In [12]: results
Out[12]:
[{'_extra': {'(t_periods.f_end - t_periods.f_start)': 118.0},
't_periods': {'f_end': datetime.datetime(2018, 1, 8, 13, 59, 21),
'f_start': datetime.datetime(2018, 1, 8, 13, 58, 3),
'id': 37278L}}]
That shows a task_duration of 118.0, whereas actually it's 1:18.
The datatypes appear correct:
In [16]: p.f_start.type
Out[16]: 'datetime'
In [17]: p.f_end.type
Out[17]: 'datetime'
I'm not sure why datetime - datetime is given a float answer.
Keith
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