python - Django 序列化程序不显示子模型字段

Question

在另一个序列化程序（外键关系）中使用模型序列化程序时，我的序列化程序没有从子模型返回字段时遇到问题。我不是在寻找解决方案，而是在寻找它为什么不起作用。

模型.py

class LinkedinAccount(models.Model):
    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=100, blank=True)
    date_created = models.DateTimeField(auto_now_add=True)
    is_prospect = models.BooleanField(default=False)

class LinkedinProspectAccount(LinkedinAccount):
    title = models.CharField(max_length=255, blank=True)
    company = models.CharField(max_length=100, blank=True)
    country = models.CharField(max_length=255, blank=True)
    city = models.CharField(max_length=255, blank=True)

序列化程序.py

class LinkedinAccountSerializer(serializers.ModelSerializer):
    class Meta:
        model = user_account.models.LinkedinAccount
        fields = ('id', 'name')
        read_only_fields = ('date_created',)


class LinkedinProspectAccountSerializer(serializers.ModelSerializer):
    class Meta:
        model = user_account.models.LinkedinProspectAccount
        fields = ('title', 'company', 'country', 'city')
        read_only_fields = ('date_created',)


class ConversationSerializer(serializers.ModelSerializer):
    linkedin_account = user_account.serializers.LinkedinAccountSerializer()
    last_message = MessageSerializer()
    prospect = user_account.serializers.LinkedinProspectAccountSerializer()

    class Meta:
        model = conversation.models.Conversation
        fields = ('id', 'linkedin_account', 'prospect', 'conversation_id', 'archived',
                  'last_message')
        lookup_field = None

    read_only_fields = ('created_at', 'updated_at',)

我从使用 generics.ListCreateAPIView 的正常 GET 请求中得到的是：

[OrderedDict([('id', 1), ('linkedin_account', OrderedDict([('id', 1), ('name', 'Test LinkedIn account')])), ('prospect', OrderedDict( )), ('conversation_id', '100'), ('archived', False), ('last_message', None)])]

前景对象没有字段，如果我在序列化程序中添加基本模型字段，它们会返回，但仍然没有子模型字段。单独使用 LinkedinProspectAccountSerializer 时，它可以正常工作。目前我正在使用它作为解决方法：

def get_prospect(self, obj):
    prospect = user_account.models.LinkedinProspectAccount.objects.get(id=obj.prospect.id)
    serializer = user_account.serializers.LinkedinProspectAccountSerializer(prospect)
    return serializer.data

标签： pythondjangodjango-rest-framework