Creating a nested JSON from a value in Django Rest Framework

Question

I'm very new to Django and the DjangoRest Framework and this is my first question on Stack overflow, please bear with me.

I am trying to create a Django Rest API that can that to handle entries for an online raffle. So each entry would have details like name, email, and a string that represents the raffle entry in the form of numbers separated by spaces(Eg: "12,23,34,45,56,67"). So far, I've been able to do the basics and create a simple model, serializer, and views.

What I need is to create a JSON similar to

{
    "entry" : "12,23,34,45,56,67",
    "name" : "SampleName",
    "email" : "[email protected]",
    "values" : [
        "one" : 12,
        "two" : 23,
        "three" : 34,
        "four" : 45,
        "five" : 56,
        "six" : 67
    ]
}

models.py

class EntryModel(models.Model):
    entry = models.CharField(null=False, max_length=17)
    name  = models.CharField(null=False, max_length=100)
    email = models.EmailField(null=False)

serializers.py

class EntrySerializer(serializers.ModelSerializer):

    class Meta:
        model = EntryModel
        fields = ['entry', 'name', 'email']

views.py

class EntryViews(viewsets.ModelViewSet):
    queryset = EntryModel.objects.all()
    serializer_class = EntrySerializer

Given the fact you already have the information in "entry" you shouldn't need it in "values". Now to do what you want, take a look at django-rest-framework.org/api-guide/fields/#listfield — Guillaume
– Guillaume, Commented Jan 2, 2021 at 15:20

Adithya · Accepted Answer · 2021-01-02 15:30:56Z

2

I'm guessing you want the entry field to be expanded into values field.

In serializer, you can use a SerializerMethodField.

class EntrySerializer(serializers.ModelSerializer):
    values = serializers.SerializerMethodField()
    class Meta:
        model = EntryModel
        fields = ['entry', 'name', 'email', 'values']
    
    def get_values(self, obj):
        #here object is the EntryModel instance, you can access the entry field with obj.entry, transform into required format and return

answered Jan 2, 2021 at 15:30

Adithya

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1 Comment

austin__abraham Over a year ago

Thank you!. I think this might just do it.

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