如何访问序列化程序中 model 的选择并获得 json 视图

Question

models.py

MSI_OPTIONS = (
    (ANC1, 'AN1'),
    (ANC2, 'AN2'),
    (ANC3, 'AN3'),
    (ANC4, 'AN4'),
    (DELIVERY, 'Delivery'),
    (FAMILY_PLANNING, 'Family Planning'),
)

class MSIService(models.Model):
    girl = models.ForeignKey(Girl, on_delete=models.CASCADE)
    option = models.CharField(choices=MSI_OPTIONS, default=ANC1, max_length=250)

I a'm trying to obtain a JSON object counting how many time each MSI_OPTIONS is used like

{ "ANC1":3, "ANC2":4 "ANC3":4 "ANC4":10 }

Note: each girl has one of MSI_OPTIONS .

Answer 1

What you might be looking for is django-aggregations

And maybe something like:

aggregated_result = MSIService.objects.annotate(num_options=Count('option'))
aggregated_result_dict = {
    element.girl, element.num_options for element in aggregated_result
}
print(aggregated_result_dict)