CODEWITHSUNDEEP
pythondjangoserializationdjango-modelsdjango-rest-framework
Giuseppe
Giuseppe

Reputation: 393

Retrieve nested dict from Django nested queryset with ForeignKey?

I have a models.py having: 

class Other(models.Model):
    name = models.CharField(max_length=200)

class ModelA(models.Model):
    name = models.CharField(max_length=200)
    other = models.ForeignKey(Other, on_delete=models.PROTECT)

in my rest API i want to retrieve as JsonResponse a json like this:

{
    "modelA": {
        "id": "modelA id automatically assigned by django model",
        "name": "my modelA name",
        "other": {
            "id": "other thing id also automatically assigned by django model",
            "name": "other thing name"
        }
    }
}

What is the most "pythonic" way to do it?

Upvotes: 1

Views: 488

Answers (1)

wencakisa
wencakisa

Reputation: 5968

What you are looking for is nested serialization.

In your serializers.py you should use the serializer for the Other model inside the one for your ModelA.

In serializers.py:

from rest_framework import serializers

from .models import Other, ModelA


class OtherSerializer(serializers.ModelSerializer):
    class Meta:
        model = Other
        fields = ('id', 'name')


class ModelASerializer(serializers.ModelSerializer):
    other = OtherSerializer(read_only=True)
    # The magic happens here.
    # You use your already created OtherSerializer inside the one for ModelA
    # And that will perform nested serialization
    # Which will produce the result that you want

    class Meta:
        model = ModelA
        fields = ('id', 'name', 'other')
        # _________________________^

And now you get result like:

{
    "id": 1,
    "name": "my modelA name",
    "other": {
        "id": 1,
        "name": "other thing name"
    }
 }

Upvotes: 2

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