我在使用Django REST Framework序列化程序时遇到了一些问题(是的,我是Django noob)。 特别是,在serializer.is_valid()调用之后,一些数据会丢失':
serializer = ReviewSerializer(data=request.data, many=False)
print serializer
if not serializer.is_valid():
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
print serializer.validated_data
这是输出:
ReviewSerializer(data={u'album': {u'spotify_id': 1, u'name': u'TEXT'},
u'rating': 1, u'artistImage': {u'url': u'ARTIST_URL'}, u'artist':
{u'genres': u'ROCK', u'spotify_id': 1, u'name': u'TEXT'},
u'review': u'TEXT', u'albumImage': {u'url': u'ALBUM_URL'}}):
review = CharField(max_length=None)
rating = DecimalField(decimal_places=1, max_digits=2)
artist = ArtistSerializer():
name = CharField(max_length=100)
genres = CharField(max_length=100)
spotify_id = CharField(max_length=50)
album = AlbumSerializer():
name = CharField(max_length=100)
spotify_id = CharField(max_length=50)
artistImage = ArtistImageSerializer()
albumImage = AlbumImageSerializer()
OrderedDict([(u'review', u'TEXT'), (u'rating', Decimal('1')),
(u'artist', OrderedDict([(u'name', u'TEXT'), (u'genres', u'ROCK'),
(u'spotify_id', u'1')])), (u'album', OrderedDict([(u'name', u'TEXT'),
(u'spotify_id', u'1')])), (u'artistImage', OrderedDict()),
(u'albumImage', OrderedDict())])
特别是,fieldImage和albumImage字段都是空的OrderedDict。 以下是序列化器:
class ReviewSerializer(serializers.Serializer):
review = serializers.CharField(max_length=None)
rating = serializers.DecimalField(decimal_places=1, max_digits=2)
artist = ArtistSerializer()
album = AlbumSerializer()
artistImage = ArtistImageSerializer()
albumImage = AlbumImageSerializer()
class AlbumImageSerializer(serializers.ModelSerializer):
class Meta:
model = ArtistImage
fields = ('url')
class ArtistImageSerializer(serializers.ModelSerializer):
class Meta:
model = ArtistImage
fields = ('url')
此外,我注意到如果我删除序列化程序打印,在验证之前,我收到错误:
serializer = ReviewSerializer(data=request.data, many=False)
if not serializer.is_valid():
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
print serializer.validated_data
Traceback (most recent call last):
...
TypeError: The `fields` option must be a list or tuple or "__all__". Got str.
答案 0 :(得分:1)
您可以尝试更换
吗?fields = ('url')
与
fields = ('url',)
括号不会自动使它们成为元组。你必须在字符串后面添加一个逗号来向python表明它应该是一个元组。
来自Docs:
一个特殊问题是构造包含0或1的元组 items:语法有一些额外的怪癖来容纳这些。空 元组是由一对空括号构成的;一个元组 通过使用逗号跟随值来构造一个项目(它不是 足以将一个值括在括号中)。丑,但是 有效的。