Django Rest Framework- foreign key throwing error - django

Question

I am using django rest framework wherein the model has composite primary key, one of the them being a foreign key.
models/TestSuite.py
class TestSuite(models.Model):
team_name = models.ForeignKey('Team', on_delete=models.DO_NOTHING, db_column='team_name')
suite_name = models.CharField(max_length=100)
description = models.CharField(max_length=200, blank=True, null=True)
schedule = models.CharField(max_length=100, blank=True, null=True)
email_list_ok = models.CharField(max_length=200, blank=True, null=True)
email_list_fail = models.CharField(max_length=200, blank=True, null=True)
template_name = models.ForeignKey('EmailTemplates', on_delete=models.DO_NOTHING, db_column='template_name')
class Meta:
managed = False
db_table = 'test_suite'
unique_together = (('team_name', 'suite_name'),)
models/Team.py
class Team(models.Model):
team_name = models.CharField(primary_key=True, max_length=30)
description = models.CharField(max_length=100, blank=True, null=True)
class Meta:
managed = False
db_table = 'team'
TestSuiteSerializer.py
class Meta:
model = models.TestSuite
fields = '__all__'
TestSuiteViewSet.py
class TestSuiteViewSet(viewsets.ModelViewSet):
queryset = models.TestSuite.objects.all()
serializer_class = serializers.TestSuiteSerializer
def create(self, request, *args, **kwargs):
serializer = self.get_serializer(data=request.data,
many=isinstance(request.data, list))
serializer.is_valid(raise_exception=True)
self.perform_create(serializer)
headers = self.get_success_headers(serializer.data)
return Response(serializer.data,
status=status.HTTP_201_CREATED, headers=headers)
Now when I do a post request, it throws below errors
When the post() has team_name already existing in team table
{
"team_name": [
"test suite with this team name already exists."
]
}
When the post() has team_name not existing in team table
Exception Type: ValueError
Exception Value:
Cannot assign "'dummy'": "TestSuite.team_name" must be a "Team" instance.
Can someone please help me here. I am assuming I am missing something.

Answer 1

The first argument to your foreign key fields should be the model itself, not a string of the model (eg. not 'Team', but Team - likewise for EmailTemplate)
class TestSuite(models.Model):
# Change this field's first argument from a string to the Team class
team_name = models.ForeignKey(Team, on_delete=models.DO_NOTHING, db_column='team_name')
suite_name = models.CharField(max_length=100)
description = models.CharField(max_length=200, blank=True, null=True)
schedule = models.CharField(max_length=100, blank=True, null=True)
email_list_ok = models.CharField(max_length=200, blank=True, null=True)
email_list_fail = models.CharField(max_length=200, blank=True, null=True)
# Change this field's first argument from a string to the EmailTemplates class
template_name = models.ForeignKey(EmailTemplates, on_delete=models.DO_NOTHING, db_column='template_name')
class Meta:
managed = False
db_table = 'test_suite'
unique_together = (('team_name', 'suite_name'),)