How to change the model column value while returning json data using django-rest framewrok

Question

I have a modal that stores an integer number, user will be giving hexadecimal number and I am converting into integer and storing it in database, Now I need to expose my model through rest-api...by doing this user would be seeing integer value not hexadecimal, how can convert integer back to hexadecimal and show it to the user in rest-api?

Model:

class Address:
    base_addr = models.BigIntegerField(blank=False, null=False)

serializer:

class AddressSerializer(serializers.HyperlinkedModelSerializer):

    class Meta:
        model = Address
        fields = (base_addr,

)

viewset:

class AddressViewSet(viewsets.ReadOnlyModelViewSet):
    model = Address
    serializer_class = AddressSerializer
    filter_fields = ('base_addr')
    filter_backends = (filters.DjangoFilterBackend, filters.OrderingFilter,)

trinchet · Accepted Answer · 2014-06-18 14:05:13Z

2

Using serializers.SerializerMethodField

class Address:
    base_addr = models.BigIntegerField(blank=False, null=False)

    def get_hexadecimal(self):
        // your convertion logic here
        return addr_in_hexadecimal

then

class AddressSerializer(serializers.HyperlinkedModelSerializer):
    bae_addr_hex = serializers.Field(source='get_hexadecimal')
    class Meta:
        model = Address
        fields = ('bae_addr_hex', ...)

edited Jun 18, 2014 at 14:05

answered Jun 17, 2014 at 14:17

trinchet

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4 Comments

trinchet Over a year ago

How about you can't change your model? you just need to add a method

Vb407 Over a year ago

Thanks trinchet, One more small information if the user queries from rest-api like.. ?address = "0x5656576" How do I convert it back to interger and search in model. (Iam new to rest)

trinchet Over a year ago

Before answer that, why you need to store Integers intead of the hexadecinal numbers? it seems you are overloading logic just for this

trinchet Over a year ago

anyway you can see how filter/search here django-rest-framework.org/api-guide/…, an example here stackoverflow.com/a/21186065/1904584, hope that helps :)

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