[英]Django annotate add interval to date
I am using postgres database with Django 2.2. 我在Django 2.2中使用postgres数据库。 I need to combine date and time field in model and add an interval of one day in it. 我需要在模型中组合日期和时间字段,并在其中添加一天的间隔。 I have done first part like this. 我已经完成了这样的第一部分。
Model.objects.annotate(
end_dt=models.ExpressionWrapper(
models.F('date') + models.F('end'),
output_field=models.DateTimeField()
)
)
Now I have to add 1 day to end_dt
. 现在我必须将1天添加到end_dt
。 I have done this with plain sql like this. 我已经用普通的sql做到了这一点。
SELECT
"db_shift"."id",
(("db_shift"."date" + "db_shift"."end") + INTERVAL '1 day') AS "end_dt"
FROM
"db_shift";
How can I achieve this using django ORM? 如何使用django ORM做到这一点? Or is it even achievable? 还是可以实现的?
After a bit of experimentation I have found that adding timedelta from datetime works just fine :) 经过一番试验,我发现从datetime添加timedelta很好:)
import datetime
Model.objects.annotate(
end_dt=models.ExpressionWrapper(
models.F('date') + models.F('end') + datetime.timedelta(days=1),
output_field=models.DateTimeField()
)
)
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