Hello,
I have a view that can create multiple instances of a model at once. The
model has a unique_together constraint and I made a ModelSerializer based
on it, something like
class MyAttributeChangelog(models.Model):
parent = models.ForeignKey(ParentModel, on_delete=models.CASCADE)
start_datetime = models.DateTimeField()
...
class Meta:
ordering = ['start_datetime']
unique_together = ['start_datetime', 'installation']
class MyAttributeChangelogSerializer(serializers.ModelSerializer):
...
class Meta:
model = MyAttributeChangelog
fields = ('id', 'parent', 'start_datetime', ...)
The view receives a list of dicts and uses the serializer (with many=True)
to validate and save them. It works fine, except for the enforcement of the
unique_together constraint. In the following test I get a IntegrityError
rather than a bad request response, which was the expected:
def test_update_changelog_list_with_duplicate_datetimes(self):
"""
...
"""
parent = Parent.objects.get(...)
url = f'/api/parents/{parent.id}/my_attribute_changelog/'
data = [
{
'start_datetime': datetime(2018, 9, 20, 9, 30, 20,
tzinfo=timezone.get_current_timezone())
...
},
{
'start_datetime': datetime(2018, 9, 20, 9, 30, 20,
tzinfo=timezone.get_current_timezone())
...
}
]
response = self.client.post(url, data, format='json')
self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
...
I tried adding the UniqueTogetherValidator explicitly to the serializer
class, despite my understanding that it would be inferred from the Model,
but the error persists.
I know I can rather easily validate this in the view, iterating through the
items, but I think the validator should take care of that. Am I missing
something?
Best regards.
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