Python <Django 对象> 不是 JSON 可序列化的
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/16790375/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
<Django object > is not JSON serializable
提问by tuna
I have the following code for serializing the queryset;
我有以下用于序列化查询集的代码；
def render_to_response(self, context, **response_kwargs):
return HttpResponse(json.simplejson.dumps(list(self.get_queryset())),
mimetype="application/json")
And following is my get_querset()
以下是我的 get_querset()
[{'product': <Product: hederello ()>, u'_id': u'9802', u'_source': {u'code': u'23981', u'facilities': [{u'facility': {u'name': {u'fr': u'G\xe9n\xe9ral', u'en': u'General'}, u'value': {u'fr': [u'bar', u'r\xe9ception ouverte 24h/24', u'chambres non-fumeurs', u'chambres familiales',.........]}]
Which I need to serialize. But it says not able to serialize the <Product: hederello ()>. Because list composed of both django objects and dicts. Any ideas ?
我需要序列化。但它说无法序列化<Product: hederello ()>. 因为列表由 Django 对象和字典组成。有任何想法吗 ？
采纳答案by alecxe
simplejsonand jsondon't work with django objects well.
simplejson并且json不能很好地处理 django 对象。
Django's built-in serializerscan only serialize querysets filled with django objects:
Django 的内置序列化器只能序列化填充了 django 对象的查询集：
data = serializers.serialize('json', self.get_queryset())
return HttpResponse(data, content_type="application/json")
In your case, self.get_queryset()contains a mix of django objects and dicts inside.
在您的情况下，self.get_queryset()其中包含 django 对象和 dicts 的混合。
One option is to get rid of model instances in the self.get_queryset()and replace them with dicts using model_to_dict:
一种选择是摆脱模型实例self.get_queryset()并使用model_to_dict以下命令替换它们：
from django.forms.models import model_to_dict
data = self.get_queryset()
for item in data:
item['product'] = model_to_dict(item['product'])
return HttpResponse(json.simplejson.dumps(data), mimetype="application/json")
Hope that helps.
希望有帮助。
回答by tuna
First I added a to_dict method to my model ;
首先，我在模型中添加了一个 to_dict 方法；
def to_dict(self):
return {"name": self.woo, "title": self.foo}
Then I have this;
然后我有这个；
class DjangoJSONEncoder(JSONEncoder):
def default(self, obj):
if isinstance(obj, models.Model):
return obj.to_dict()
return JSONEncoder.default(self, obj)
dumps = curry(dumps, cls=DjangoJSONEncoder)
and at last use this class to serialize my queryset.
最后使用这个类来序列化我的查询集。
def render_to_response(self, context, **response_kwargs):
return HttpResponse(dumps(self.get_queryset()))
This works quite well
这很好用
回答by Danny Staple
I found that this can be done rather simple using the ".values" method, which also gives named fields:
我发现这可以使用“.values”方法来完成，该方法还提供命名字段：
result_list = list(my_queryset.values('first_named_field', 'second_named_field'))
return HttpResponse(json.dumps(result_list))
"list" must be used to get data as iterable, since the "value queryset" type is only a dict if picked up as an iterable.
“列表”必须用于获取可迭代的数据，因为“值查询集”类型只是作为可迭代的字典。
Documentation: https://docs.djangoproject.com/en/1.7/ref/models/querysets/#values
文档：https: //docs.djangoproject.com/en/1.7/ref/models/querysets/#values
回答by Yash
From version 1.9 Easier and official way of getting json
从版本 1.9 获取 json 的更简单和官方的方式
from django.http import JsonResponse
from django.forms.models import model_to_dict
return JsonResponse( model_to_dict(modelinstance) )
回答by YPCrumble
The easiest way is to use a JsonResponse.
最简单的方法是使用JsonResponse。
For a queryset, you should pass a list of the the valuesfor that queryset, like so:
对于查询集，您应该传递该查询集的列表values，如下所示：
from django.http import JsonResponse
queryset = YourModel.objects.filter(some__filter="some value").values()
return JsonResponse({"models_to_return": list(queryset)})
回答by Woody Johnson
Our js-programmer asked me to return the exact JSON format data instead of a json-encoded string to her.
我们的 js 程序员让我向她返回确切的 JSON 格式数据而不是 json 编码的字符串。
Below is the solution.(This will return an object that can be used/viewed straightly in the browser)
下面是解决方案。（这将返回一个可以在浏览器中直接使用/查看的对象）
import json
from xxx.models import alert
from django.core import serializers
def test(request):
alert_list = alert.objects.all()
tmpJson = serializers.serialize("json",alert_list)
tmpObj = json.loads(tmpJson)
return HttpResponse(json.dumps(tmpObj))
