[Django_Rest_Framework] Dynamic serializer fields

Dynamic fields in serializer can retrieve the required fields from the model, and speed up the serializing if the query doesn’t need to retrieve all fields.

• Setup the dynamic serializer

class DynamicSerializer(serializers.ModelSerializer):
  first= FirstSerializer()
  second = SecondSerializer()
  third = ThirdSerializer()

  def __init__(self, *args, **kwargs):
    required_fields = kwargs.get("context", {}).get("fields")

    super(DynamicSerializer, self).__init__(*args, **kwargs)

    if required_fields:
      required = set(required_fields)
      existed = set(self.fields)

      for field in existed - required:
        self.fields.pop(field)

• Usage in view

fields = ["first", "third"]
queryset = Model.objects.all()
data = DynamicSerializer(queryset, context={"fields": fields}).data