Losing foreign key value in Django REST serializer

[Alexander Teut]

0down votefavorite

I've simplified my code to make problem more clear.

I have two related models in my Django REST project. In my models.py:

class Project(Models.model):
    name = models.CharField(max_length=150)
class Item(models.Model):
    project = models.ForeignKey(Project, blank=True, on_delete=models.CASCADE)
    data = models.TextField(blank=True, null=True)

Then I create a serialiser:

class ItemSerializer(serializers.ModelSerializer):
    class Meta:
        model = Item
        fields = ('id', 'project_id', "data")

View set:

class ItemViewSet(viewsets.ModelViewSet):
    queryset = Item.objects.all()
    serializer_class = ItemSerializer
    filter_backends = (DjangoFilterBackend,)
    filter_fields = ('project_id')

Router:

router.register(r'items', ItemViewSet)

This implementation works fine for models without foreign keys. But when I post something like:

{
    project_id: 1,
    data: "text"
}

(the project with id=1 exists)

my ItemSerializer gets just { data: "text" } to validated_fields.

The project_id field is completely lost during validation.

How to configure Serializer or ViewSet to make it workable?

[Xavier Ordoquy]

Hi,

In your serializer and your payload, replace « project_id » with « project ».

DRF expects same named relation fields to be serialized/deserialized by default.

project_id exists in the model so it’s accepted by DRF but since it has no field in the model associated (it’s a property) it’ll be a ReadOnlyField.

Regards,

Xavier Ordoquy,

Linovia

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[Alexander Teut]

Thank you!

I fixed it this way:

class ItemSerializer(serializers.ModelSerializer):

    research = serializers.PrimaryKeyRelatedField(queryset=Project.objects.all())

    class Meta:
        model = Item
        fields = ('id', 'project', "data")

вторник, 29 мая 2018 г., 19:07:23 UTC+3 пользователь Xavier Ordoquy написал:

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[Pallavi Singh]

i am new for drf,and i m trying to do forget password ,how can i do?

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[Francisco Pandol]

Pallavi you can use https://github.com/sunscrapers/djoser

But the next time please create a new thread for an unrelated question.

--

Francisco Pandol

[Pallavi Singh]

how to create a new thread for an unrelated questions?will u pls guide me?

Francisco Pandol