json 如何在 django rest 框架中定义列表字段？
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How can I define a list field in django rest framework?
提问by user1876508
Let's say I have a class
假设我有一堂课
class Tags(object):
tags = []
def __init__(self, tags):
self.tags = tags
and a custom list field
和自定义列表字段
class TagsField(serializers.WritableField):
"""
Returns a list of tags, or serializes a list of tags
"""
I am not too sure where to go from here. How can I make sure that a blog post serializer defined as
我不太确定从这里去哪里。如何确保博客文章序列化程序定义为
class BlogPostSerializer(serializers.Serializer):
post = CharField()
tags = TagsField
would give me a json object similar to
会给我一个类似于
{
"post": "Here is my blog post about python",
"tags": ["python", "django", "rest"]
}
采纳答案by sebastibe
One way to deal with arraysfor a non ORM-based object is to override the to_nativeand from_nativemethods. In your case:
处理非基于 ORM 的对象的数组的一种方法是覆盖to_native和from_native方法。在你的情况下：
class TagsField(serializers.WritableField):
def from_native(self, data):
if isinstance(data, list):
return Tags(data)
else:
msg = self.error_messages['invalid']
raise ValidationError(msg)
def to_native(self, obj):
return obj.tags
If you had an ORM-based object you would like to look at the SlugRelatedFieldwith the many = Trueattribute.
如果您有一个基于 ORM 的对象，您希望查看SlugRelatedField带有many = True属性的 。
From Django Rest Framework version 3.0 you can also use ListField http://www.django-rest-framework.org/api-guide/fields/#listfield
从 Django Rest Framework 3.0 版开始，您还可以使用 ListField http://www.django-rest-framework.org/api-guide/fields/#listfield
回答by michel.iamit
There is also the ListField in django rest framework, see http://www.django-rest-framework.org/api-guide/fields/#listfield
django rest 框架中也有 ListField，参见http://www.django-rest-framework.org/api-guide/fields/#listfield
wtih the examples:
与示例：
scores = serializers.ListField(
child=serializers.IntegerField(min_value=0, max_value=100)
)
and (other notation):
和（其他符号）：
class StringListField(serializers.ListField):
child = serializers.CharField()
this seems simpler (maybe this class is added later than the accepted anwser, but seems good to add this option anyway)
这看起来更简单（也许这个类是在接受的 anwser 之后添加的，但无论如何添加这个选项似乎很好）
By the way, it's added since djang rest framework 3.0: http://www.django-rest-framework.org/topics/3.0-announcement/
顺便说一句，它是从 djang rest framework 3.0 开始添加的：http: //www.django-rest-framework.org/topics/3.0-announcement/
回答by Ali Rasim Kocal
If you are using Postgesql, you can use an ArrayField
如果您使用的是 Postgesql，则可以使用ArrayField
