Question

当我尝试在Postman中执行PUT请求时，我在Django中遇到了一个问题。

我怀疑问题是因为我在模型类中嵌套了序列化程序，但我不确定。

class Foo(models.Model):
    foo_name = models.CharField(max_length=50, unique=True)

    foo_statistics = models.ManyToManyField(TrainStatistics)

class FooSerializer(serializers.ModelSerializer):
    blah_statistics = BlahStatisticsSerializer(many=True)

    class Meta:
        model = Foo
        fields = ('foo_statistics')
        depth = 2 

    def create(self, validated_data):
        """
        Create and return a new `Summary` instance, given the validated data.
        """

        blah_statistics_data = validated_data.pop('blah_statistics')
        foo = Foo(**validated_data)

        for blah_statistic in blah_statistics_data:
            FooStatistic.objects.create(summary=summary, **train_statistic)
        return summary

    def update(self, instance, validated_data):
        """
        Update and return an existing `Foo` instance, given the validated data.
        """
        instance.blah_statistics = validated_data.get('blah_statistics', instance.blah_statistics) # This line is causing problems

知道可能导致此问题的原因是什么？

Answer 1

问题是经过验证的数据会将train_statistics变成OrderedDict（使用嵌套序列化程序时总是有点棘手），因此OrderedDicts不可用，所以当你尝试＆＃34; .get＆＃34;它引发了一个错误。

选项是将您的字段train_statistics设置为只读。

然后在update()方法中，使用validated_data获取train_statistics，而不是使用request.data来获取create()。对class SummarySerializer(serializers.ModelSerializer): train_statistics = TrainStatisticsSerializer(many=True, read_only=True) class Meta: model = Summary fields = ('train_statistics') depth = 2 def create(self, validated_data): """ Create and return a new `Summary` instance, given the validated data. """ request = self.context['request'] train_statistics_data = request.data.get('train_statistics') summary = Summary.objects.create(**validated_data) for train_statistic in train_statistics_data: TrainStatistics.objects.create(summary=summary, **train_statistic) return summary def update(self, instance, validated_data): """ Update and return an existing `Summary` instance, given the validated data. """ request = self.context['request'] instance.train_statistics =request.data.get('train_statistics', instance.train_statistics) # This line is causing problems方法执行相同的操作。

SummarySerializer(instance, data=data, context={'request':request})

调用序列化程序时，需要将请求对象作为上下文数据传递。

SummarySerializer(data=data, context={'request':request})

或

page.content = <body><b>Title:</b> Test title</body>

不可用的类型：＆＃39; OrderedDict＆＃39;

1 个答案: