类型为'NoneType'的Python参数不可迭代

Question

发布以下json时出现错误： {"email":"test@test.com", "password":"12345", "repeatPassword":"12345"}

我正在使用Django-Rest_framework，所以我想可能设置了错误？

这是序列化器

class UserSerializer(serializers.ModelSerializer):
    repeatPassword = serializers.CharField(write_only=True, required=True, label="Re-enter Password")
    def validate(self, attrs):
        passwordValue = attrs["password"]
        repeatPasswordValue = attrs["repeatPassword"]


        if passwordValue is not None and passwordValue != "":
            if repeatPasswordValue is None or repeatPasswordValue == "":
                raise serializers.ValidationError("Please re-enter your password")

        if passwordValue != repeatPasswordValue:
            serializers.ValidationError("Passwords must match")

        return attrs

    class Meta:
        model = User
        fields = ("email", "username", "password")
        read_only_fields = ("username",)
        write_only_fields = ("password",)

该视图只是我拥有的User模型的基本ModelViewSet

也许我没有正确配置url.py文件？ 这就是我所拥有的urlpatterns。

urlpatterns = patterns('',
    (r'^user/$', UserViewSet.as_view({"get": "list", "put": "create"})))

Answer 1

看来您可能已经省略了一些代码。 我遇到了同样的问题，导致验证器函数未返回attrs变量，因此我的代码如下所示：

def validate_province(self, attrs, source):
    // unimportant details

这解决了它：

...
    def validate_province(self, attrs, source):
        // unimportant details
        return attrs
...

---

附带说明，您忘了提出例外之一：

...
    if passwordValue != repeatPasswordValue:
        serializers.ValidationError("Passwords must match")
...

更改为：

...
    if passwordValue != repeatPasswordValue:
        raise serializers.ValidationError("Passwords must match")
...