How to get the model default value after creating new, without call another get?

Question

Is there any way to get default value (such as ID of type UUID) after creating a new row.

Here is my model

class Employee(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    name= models.CharField(max_length=255)
    created_at = models.DateField(default=None, blank=True, null=True)
    class Meta:
        db_table="business"

When I create I do this, for example

from rest_framework import generics
from django.forms.models import model_to_dict

class Create(generics.CreateAPIView):
    def post(self, request)
        inputData = {"name":"abcdef", "created_at": datetime.datetime.now}
        employee = Employee.objects.create(**inputData)    
        return JsonResponse(model_to_dict(employee), safe=False)

Here is the response:

{
    "name": "abcdef",
    "created_at": "2022-05-24T10:36:39.126",
}

So now I dont know what is the ID of the new row I just create

score 1 · Accepted Answer · answered May 24 '22 at 12:02

It happens because you set id as non-editable. At the same time, model_to_dict returns a dictionary suitable for passing as a Form's initial keyword argument.

You can easily check the source code of model_to_dict, and see that fields with such attribute set are skipped. Check this Convert Django Model object to dict with all of the fields intact it might be helpfull.

How to get the model default value after creating new, without call another get?

1 Answers1