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这是我的 UserExtendedSerializer：

class UserExtendedSerializer(serializers.ModelSerializer):

    def __init__(self, *args, **kwargs):
            super(UserExtendedSerializer, self).__init__(*args, **kwargs) # call the super() 
            for field in self.fields: # iterate over the serializer fields
                self.fields[field].error_messages['required'] = 'Enter a valid %s.'%field # set the custom error message
                self.fields[field].error_messages['invalid'] = 'Select a valid %s.'%field # set the custom error message
    class Meta:
        model = UserExtended
        fields = ('country',)

这是我的models.py：

class Country(models.Model):
    countryName = models.CharField(max_length=50, unique=True)
    countryCode = models.CharField(max_length=10, unique=True)

class UserExtended(models.Model):
    user = models.OneToOneField(User)
    country = models.ForeignKey(Country)

我的问题是，当用户提交无效类型（Django 需要一个整数/pk 值，但假设用户提交字符串“a”）时，Django 会向前端发送一个错误，说“类型不正确。预期的 pk 值，已收到列表。” 即使我覆盖了序列化程序中的“无效”错误消息。为什么发送到前端的错误信息不是“Select a valid country”而是“Incorrect type. Expected pk value, received list”。反而？

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1 回答 1

1

首先执行 Django 验证，因此您可以设置country field为只读并阻止 django 模型验证，然后在您的update/create方法中，验证国家并在需要时引发错误。您还需要创建 CountrySerializer

class CountrySerializer(serializers.ModelSerializer):
    #country serializer fields goes here

class UserExtendedSerializer(serializers.ModelSerializer):
        country = CountrySerializer(read_only=True)
        class Meta:
            model = UserExtended
            fields = ('country',)

        def check_country(self):
            request = self.context['request']
            data = request.data
            country_data = data.get('country'):
            #Validated your country data
            #valid_country = .....
            if not valid_country:
                 raise serializers.ValidationError("Select a valid country")


        def create(self,validated_data):

            self.check_country()
            super(UserExtended,self).create(self,validated_data)

        def update(self,instance,validated_data):

            self.check_country()
            super(UserExtended,self).update(self,instance,validated_data)
于 2015-10-02T16:06:10.230 回答