Django REST Serializer Method Writable Field

Here is a read/write serializer method field:

class ReadWriteSerializerMethodField(serializers.SerializerMethodField):
    def __init__(self, method_name=None, **kwargs):
        self.method_name = method_name
        kwargs['source'] = '*'
        super(serializers.SerializerMethodField, self).__init__(**kwargs)

    def to_internal_value(self, data):
        return {self.field_name: data}