re: Aggregation in Django JSONFields VIEW POST

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re: Here are my code and I used Django 2.2.2, when I query data JSON value does come as None type and the count does bring value from django.db impor...

Unfortunately, all I can say is, it works for me.

Here is my example code that I used to create some example data:

import datetime as dt # don't care about timezones right now

expected = {"energy": 90.78559770167864, "irradiation": 30.085498370965905}
observed = {"energy": 10.78559770167864, "irradiation": 20.085498370965905}

today = dt.date.today()

# Just create some identical objects, I don't think that this matters right now

DataPoint.objects.create(datetime=today, expected=expected, observed=observed)
DataPoint.objects.create(datetime=today, expected=expected, observed=observed)
DataPoint.objects.create(datetime=today, expected=expected, observed=observed)
DataPoint.objects.create(datetime=today, expected=expected, observed=observed)

date_from = today - dt.timedelta(days=4)
date_to = today + dt.timedelta(days=3)

object_data = DataPoint.objects.counts_and_sums(date_from, date_to)

print(object_data)
<QuerySet [{'day': datetime.datetime(2019, 9, 10, 0, 0, tzinfo=<DstTzInfo 'Europe/Berlin' CEST+2:00:00 DST>), 'count': 4, 'observed_irradiation_total': 80.3419934838636, 'observed_energy_total': 43.1423908067146, 'expected_irradiation_total': 120.341993483864, 'expected_energy_total': 363.142390806715}]>

And just for the records, my version, taken from the same shell:

import django
print(django.VERSION)
(2, 2, 2, 'final', 0)

The only thing I changed in your code, is that I removed the plant_id ForeignKey

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