Invoke the JSON API normalizer

        Perform the following:

            * add the type as a rtype property
            * flatten the payload
            * add the id as a rid property ONLY if present

        We don't need to vet the inputs much because the Parser
        has already done all the work.

        :param body:
            the already vetted & parsed payload
        :return:
            normalized dict

def normalize(self, body):
        """ Invoke the JSON API normalizer

        Perform the following:

            * add the type as a rtype property
            * flatten the payload
            * add the id as a rid property ONLY if present

        We don't need to vet the inputs much because the Parser
        has already done all the work.

        :param body:
            the already vetted & parsed payload
        :return:
            normalized dict
        """

        resource = body['data']
        data = {'rtype': resource['type']}

        if 'attributes' in resource:
            attributes = resource['attributes']
            attributes = self._normalize_attributes(attributes)

            data.update(attributes)

        if 'relationships' in resource:
            relationships = resource['relationships']
            relationships = self._normalize_relationships(relationships)

            data.update(relationships)

        if resource.get('id'):
            data['rid'] = resource['id']

        return data