用新的动态创建的字段更新模型对象？(Update model object with new dynamicaly created field?)

用新的动态创建的字段更新模型对象？(Update model object with new dynamicaly created field?)

我有Queryset： queryset = Status.objects.all()[:10] 模型Status没有字段commentAmount所以我将它添加到Queryset中的每个对象：

for s in queryset: s.commentAmount = s.getCommentAmount()

一切都很好， print s.commentAmount显示良好的结果，但后：

response = HttpResponse() response['Content-Type'] = "text/javascript" response.write(serializers.serialize("json", queryset)) return response

我没有字段commentAmount在返回JSON文件。 我的错误在哪里？

I have Queryset: queryset = Status.objects.all()[:10] Model Status hasn't got field commentAmount so I would add it to every object in Queryset:

for s in queryset: s.commentAmount = s.getCommentAmount()

All is fine, print s.commentAmount shows good results, but after:

response = HttpResponse() response['Content-Type'] = "text/javascript" response.write(serializers.serialize("json", queryset)) return response

I have not field commentAmount in returning JSON file. Where is my mistake?

最满意答案

commentAmount没有显示出来的原因是因为当Django进行序列化时，它循环遍历模型中声明的字段以及这些字段。

考虑循环遍历模板中的查询集并手动创建json或使用另一个序列化工具（如simplejson） 。

The reason commentAmount is not showing up is because when Django does the serialization, it loops through the fields declared on the model and only those fields.

Consider looping through your queryset in a template and creating the json manually or using another serialization tool such as simplejson.