django - 如何配置 Django Rest Framework 以返回带有自定义文本的错误

Question

我想在向数据库添加新项目时自定义 JSON 响应，它返回以下内容。

HTTP 400 BAD REQUEST 
Content-Type: application/json Vary: 
Accept Allow: POST, OPTIONS

{
"nick": [
    "Users with this Nick already exists."
    ]
}

和

{
"nick": [
    "Your username is empty"
    ]
}

我希望它返回(此用户名已存在，请使用其他用户名。)

或者

"Username %s already exists", (self.nick)

我使用了以下示例，但如果值为空或无效，则不起作用。

def validate_title(self, attrs, source):
    """
    Check that the blog post is about Django.
    """
    value = attrs[source]
    if "django" not in value.lower():
        raise serializers.ValidationError("Blog post is not about Django")
    return attrs

这是发送到 API 的 JSON。

{
    "name": "myname",
    "nick":"",
    "type_account":"1",
    "email":"my-email@gmail.com",
    "pass_field":"12345"
}

序列化程序.py

class userSerializer(serializers.ModelSerializer):

    class Meta:
        model = users
        fields = ('nick', 'email', 'pass_field', 'type_account')

    def validate_nick(self, attrs, source):

        value = attrs[source]
        if not value:
            raise serializers.ValidationError('Username cannot be empty')
        elif self.Meta.model.objects.filter(nick=value).exists():
            raise serializers.ValidationError("Username "+value+" is in use")
        return attrs

View .py

@api_view(['POST'])
def user_add(request):
    """
    Saves a new user on the database
    """

    if request.method == 'POST':

        serializer = userSerializer(data=request.DATA)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        else:
            return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

Answer 1

这个问题的答案还添加了以下内容作为@Fiver 回答

class userLoginSerializer(serializers.ModelSerializer):

    nick  =  serializers.CharField(error_messages={'required':'Please Type a Username'})
    pass_field = serializers.CharField(error_messages={'required':'Please Type a Password'})

    class Meta:
        model = users
        fields = ('nick', 'pass_field')