Question

说我有三个这样的模型：

class Message(models.Model):
    text = models.TextField()
    img = models.ForeignKey('Image')


class Image(models.Model):
    deleted = models.BooleanField()
    url = models.URLField()
    msg = models.ForeignKey('Message')

class Tag(models.Model):
    deleted = models.BooleanField()
    name = models.CharField(max_length=10)
    msg = models.ForeignKey('Message')

序列化Message时，我需要将其tag和url删除，这意味着deleted字段是False。我希望自定义的SlugField应该像这样工作：

class ValidSlugField(serializers.SlugRelatedField):
    def __init__(self, *args, **kwargs):
        super(ValidSlugField, self).__init__(*args, **kwargs)

    def get_queryset(self):
        return super(ValidSlugField, self).get_queryset().filter(deleted=False)

但是get_queryset引发了错误。是否可以像这样创建一个“通用验证”字段？

Answer 1

我不明白为什么您要创建3个模型，也许您可以按照自己的意愿做类似的事情。

仅创建一个包含所有字段的模型。

创建一个自定义序列化器，该序列化器是：

class MessageSerializer(serializers.Serializer):
    #all fields are here

使用此链接可以验证消息。 https://www.django-rest-framework.org/api-guide/serializers/#validation

class MessageSerializer(serializers.Serializer):
    #all fields are here
    def validate(self,data):
        deleted = data.get('deleted')
        text = data.get('text')    
        img = data.get('img')
        if : #the shape of text or img for deleted is false
             data['deleted'] = false 
             return data
        return data #the shape of text or img for deleted is true
    def save(self):
          #use validated_data here

可以使用save()方法使用经过验证的数据，例如
deleted = self.validated_data['deleted']

如何将过滤器应用于Django rest-framework序列化器字段？

1 个答案: