core.py 文件源码

def to_json(self, *, fields=None, embed=None):
        ''' Serializes this model to a JSON representation so it can be sent
        via an HTTP REST API '''
        json = dict()

        if fields is None or 'id' in fields:
            json['id'] = self.id

        if fields is None or '_type' in fields:
            json['_type'] = type(self).cls_key()

        def fieldfilter(fieldtuple):
            return\
                not fieldtuple[1].private and\
                not isinstance(fieldtuple[1], Relation) and (
                    fields is None or fieldtuple[0] in fields
                )

        json.update(dict(starmap(
            lambda fn, f: (fn, f.to_json(getattr(self, fn))),
            filter(
                fieldfilter,
                self.proxy
            )
        )))

        if embed:
            for requested_relation in parse_embed(embed):
                relation_name, subfields = requested_relation

                if not hasattr(self.proxy, relation_name):
                    continue

                relation = getattr(self.proxy, relation_name)

                if isinstance(relation, ForeignIdRelation):
                    item = relation.get()

                    if item is not None:
                        json[relation_name] = item.to_json(fields=subfields)
                    else:
                        json[relation_name] = None
                elif isinstance(relation, MultipleRelation):
                    json[relation_name] = list(map(lambda o: o.to_json(fields=subfields), relation.get()))

        return json