DynamicFieldsModelSerializer.py

class DynamicFieldsModelSerializer(serializers.ModelSerializer):
    """
    A ModelSerializer that takes an additional `fields` argument that
    controls which fields should be displayed.
    based on https://bit.ly/2TnW0ZJ
    Usage: api_endpoint/?fields=uid,name,alias,parent
           api_endpoint/?fields!=parent
    """

    def __init__(self, *args, **kwargs):
        # Instantiate the superclass normally
        super(DynamicFieldsModelSerializer, self).__init__(*args, **kwargs)

        fields = self.context['request'].query_params.get('fields')
        not_fields = self.context['request'].query_params.get('fields!')
        if fields:
            fields = fields.split(',')
            # Drop any fields that are not specified in the `fields` argument.
            allowed = set(fields)
            existing = set(self.fields.keys())
            for field_name in existing - allowed:
                self.fields.pop(field_name)
        elif not_fields:
            not_fields = not_fields.split(',')
            # Drop any fields that are not specified in the `fields` argument.
            for field_name in not_fields:
                self.fields.pop(field_name)