Nested fields when using Meta.fields = '__all__' are not detected?

[Gonzalo Amadio]

Hi! , I have two serializers, one nested into the other. If I use the flag all in the Meta.fields in the nested serializer. I have the following error:

The field 'sample_groups' was declared on serializer HoldbackGroupSerializer, but has not been included in the 'fields' option.

Here is the code of the serializers

class HoldbackSerializer(DynamicFieldsMixin, NestedModelSerializer):
    holdback_groups = NestedField(HoldbackGroupSerializer, many=True, required=False, create_ops=["create"])
    class Meta:
        model = Holdback
        exclude = ('start_calendar_id',)

class HoldbackGroupSerializer(DynamicFieldsMixin, NestedModelSerializer):
    # Many is true, because this is the reversed relation.
    # Field is called as related name in SampleGroup FK field to this model.
    sample_groups = NestedField(SampleGroupSerializer, many=True, required=False, create_ops=["create"])
    class Meta:
        model = HoldbackGroup
        fields = '__all__'

Here are the models:

class Holdback(models.Model):
    title = models.CharField(max_length=CHAR_FIELD_MAX_WIDTH)

class HoldbackGroup(models.Model):
    name = models.CharField(max_length=128)
    holdback = models.ForeignKey(
        'Holdback', on_delete=models.PROTECT, db_column='holdback_id', related_name='holdback_groups'
    )

class SampleGroup(models.Model):
    name = models.CharField(max_length=128)
    holdback_group = models.ForeignKey(
        'HoldbackGroup', on_delete=models.PROTECT, db_column='holdback_group_id', related_name='sample_groups'
    )

If I try to create a HoldBackGroup posting to it's endpoint, it works ok (I post some other fields without sublocations).

But when I try to create a Holdback with a nested HoldbackGroup I have that error.

I am posting this payload:

{
    "start_datetime": "2021-05-14T16:56:28.789002-03:00",
    "holdback_groups": {
        "create": [
            {
            "name": "somename3", 
            "holdback": 1
            }
        ]
    }
}

And having this error:
The field 'sample_groups' was declared on serializer HoldbackGroupSerializer, but has not been included in the 'fields' option.

[Yezy Ilomo]

Can I see how the sample_groups field is defined in your serializer?. Including HoldbackGroupSerializer will be helpful cuz it's the one that has been included here NestedField(HoldbackGroupSerializer, many=True, required=False, create_ops=["create"]) and not GroupSerializer.

[Gonzalo Amadio]

Can I see how the sample_groups field is defined in your serializer?. Including HoldbackGroupSerializer will be helpful cuz it's the one that has been included here NestedField(HoldbackGroupSerializer, many=True, required=False, create_ops=["create"]) and not GroupSerializer.

Sorry, there you have more and better code. This is how it is

[Yezy Ilomo]

I think you might have a problem somewhere else in your code, I've copied your example as it is and tested it on my side but I've not encountered that error, I even copied your payload and this is what I got on my side after running it

{'id': 1, 'holdback_groups': [OrderedDict([('id', 1), ('sample_groups', []), ('name', 'somename3'), ('holdback', 1)])], 'title': 'Hello there'}

Below is the payload that I sent

{
    "title": "Hello there",
    "holdback_groups": {
        "create": [
            {
            "name": "somename3"
            }
        ]
    }
}

I added the title because it was required.

I even tried including sample groups with the payload below

{
    "title": "Hello there",
    "holdback_groups": {
        "create": [
            {
            "name": "somename3",
            "sample_groups": {
                "create": [{"name": "This is sample group"}]
            }
            }
        ]
    }
}

And below is the response that I got

{'id': 1, 'holdback_groups': [OrderedDict([('id', 1), ('sample_groups', [OrderedDict([('id', 1), ('name', 'This is sample group'), ('holdback_group', 1)])]), ('name', 'somename3'), ('holdback', 1)])], 'title': 'Hello there'}