Merge two fields in one in a Django Rest Framework Serializer

Question

I am using Django Rest Framework authentication system which comes with a default user table. In that table it splits first and last name in two different char fields.

Is it possible to join these two fields in a serializer? Something like this:

class UserSerializer(serializers.ModelSerializer):
    full_name = serializers.CharField(source='user.first_name' + ' ' + 'user.last_name')

So that I would get the following response:

{
    full_name: "firs_name last_name"
}

Ivan Semochkin · Accepted Answer · 2017-11-15 09:15:42Z

33

You can create method in your serializer and show it by SerializerMethodField

class UserSerializer(serializers.ModelSerializer):
    full_name = serializers.SerializerMethodField()

    def get_full_name(self, obj):
        return '{} {}'.format(obj.first_name, obj.last_name)

edited Nov 15, 2017 at 9:15

answered Sep 8, 2016 at 10:02

Ivan Semochkin

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1 Comment

Elias Prado Over a year ago

Is it possible to add two or more payloads into one with this approach?

Premkumar chalmeti · Accepted Answer · 2021-09-30 04:16:06Z

5

@Ivan semochkin's answer works if the full_name is a read-only field but in my case I allow users to set full name so had to create a custom field and it works in both cases.

class FullNameField(serializers.Field):
    def to_representation(self, value):
        return value.get_full_name()

    def to_internal_value(self, full_name):
        fname, lname = full_name.split(' ')
        return {'first_name': fname, 'last_name': lname}

Now include this field in your serializer.

class UserSerializer(serializers.ModelSerializer):
    full_name = FullNameField(source='*')

edited Sep 30, 2021 at 4:16

answered Aug 11, 2021 at 19:18

Premkumar chalmeti

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1 Comment

Dawid Żurawski Over a year ago

This reponse could be improved because 1) ret is not defined 2) value.get_full_name() - might be mention which method is that (I guess model method) I gave +1 anyway because it was helpful and works for me (read + set value) ;)

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