django orm queryset - how to perform sql query MIN/MAX FILTER

Question

I am trying to get help to create django ORM queryset for the particular sql statement (you can also run it here) https://dbfiddle.uk/?rdbms=postgres_13&fiddle=31c9431d6753e2fdd8df37bbc1869e88

In particular to this question, I am more interested in the line that consist of:

MIN(created_at::time) FILTER (WHERE activity_type = 1) as min_time_in,
MAX(created_at::time) FILTER (WHERE activity_type = 2) as max_time_out

Here is the whole sql if possible to convert to django ORM queryset

SELECT 
    created_at::date as created_date,
    company_id,
    employee_id,
    MIN(created_at::time) FILTER (WHERE activity_type = 1) as min_time_in,
    MAX(created_at::time) FILTER (WHERE activity_type = 2) as max_time_out
FROM
   timerecord
where date(created_at) = '2020-11-18' and employee_id = 1
GROUP BY created_date, company_id, employee_id
ORDER BY created_date, employee_id

Answer 1

You can use the aggregate()--(doc) method or (annotate()--(doc) method) to get the result. For that, you must use the Min() and Max() database functions along with the filter parameter.

from django.db.models import Min, Q, Max

agg_response = TimeRecord.objects.aggregate(
    min_time_in=Min("created_at", filter=Q(activity_type=1)),
    max_time_out=Max("created_at", filter=Q(activity_type=2)),
)