AttributeError:类型对象“ContactRequestSerializer”没有属性“get\u extra\u actions”

Question

我用Django REST创建了一个restapi。我得到以下错误：

AttributeError: type object 'ContactRequestSerializer' has no attribute 'get_extra_actions'

class ContactRequestSerializer(serializers.ModelSerializer):
class Meta:
    model = ContactRequest
    fields = '__all__'

class ContactFormSerializer(serializers.ModelSerializer):
    class Meta:
        model = ContactForm
        fields = '__all__'

class ProjectRequestSerializer(serializers.ModelSerializer):
    class Meta:
        model = ProjectRequest
        fields = '__all__'

我已经在我的所有序列化程序中指定了相同的属性，并且从同一个类继承了这些属性，但是问题仍然存在。在

我有一个API文件，我在那里创建视图集

^{pr2}$

然后我的模特们：

...
class ContactRequest(models.Model):
    topic = models.CharField(max_length=30)
    description = models.CharField(max_length=200)
    time = models.CharField(max_length=15)
    project_request = models.ForeignKey(ProjectRequest, on_delete=models.CASCADE)

因为他们看起来都一样，除了我的两个模特之间的关系，我想不出问题所在。在