我想知道如何序列化嵌套的字典Schema。
天真地，我希望这样的语法可以工作：
fields.List(Schema)
fields.Dict(Schema)
或者可能
fields.List(fields.Nested(Schema))
fields.Dict(fields.Nested(Schema))
序列化一个列表Schema可以通过 实现，Nested(Schema, many=True)但我不知道一个dict。Schema
假设，例如，我的对象是这样定义的：
from marshmallow import Schema, fields, pprint
class AlbumSchema(Schema):
year = fields.Int()
class ArtistSchema(Schema):
name = fields.Str()
# What should I write, here?
# This won't work
albums = fields.Nested(AlbumSchema(), many=True)
# If I write this, AlbumSchema is ignored, so this is equivalent to
albums = fields.Dict(AlbumSchema(), many=True)
# this, which is not satisfying (AlbumSchema unused)
albums = fields.Dict()
# This is not the way either
albums = fields.Dict(fields.Nested(AlbumSchema))
album_1 = dict(year=1971)
album_2 = dict(year=1970)
bowie = dict(name='David Bowie',
albums={
'Hunky Dory': album_1,
'The Man Who Sold the World': album_2
}
)
schema = ArtistSchema()
result = schema.dump(bowie)
pprint(result.data, indent=2)
我希望我的对象被序列化为
{ 'albums': { 'Hunky Dory': {'year': 1971},
'The Man Who Sold the World': {'year': 1970}},
'name': 'David Bowie'}
（问题也在GitHub 上讨论过。）