问题描述
- Serialize django model with foreign key models
- Serializing Foreign Key objects in Django
- get foreign key objects in a single query - Django
有几个问题要求同样的事情已经。但是他们从2010年起就没有帮助我。所以我想这可能是自2010年以来这一方面的更新？
There are couple of question asking for the same thing already. But they are from 2010, and it didn't help me so much. So I figure it maybe been some update to this front since 2010?
在Google上我发现这个，其中说明了使用。然而，我的问题是从 django.contrib.auth.models.User 获取异物，所以没有帮助。
On google I found this link, which explain usage of natural keys. However my problem concerns of getting foreign objects from django.contrib.auth.models.User so it doesn't help.
我的问题如下。我想序列化QuerySet，所以我也得到外键对象，因为我想把它作为JSON传递给客户端。来自 django.core 的序列化程序不会这样做。所以在我的情况下，简单的问题，我添加了另一个字段到模型，以包含我需要的外部对象的值。但是它引入了冗余数据。
My problem is as following. I want to serialize the QuerySet so I get the foreign key objects also, because I want to pass it as JSON to the client. The serializer from django.core doesn't do that. So in my case to simply the problem I had added another field to the model to contain the value I need from the foreign object. But it however introduce redundant data.
我的示例模型包含用户名，如果可能，我想删除，而不是通过外键获取它。
My example model it contains the username which I would like if possible remove, and instead get it by the foreign key.
user = models.ForeignKey(User)
username = models.CharField(max_length=100, null=False)
推荐答案
这样做的方法是根据查询集的返回来构建自己的字典对象。你可以这样做：
One potential way around this is to construct your own dictionary object based on the returns of a queryset. You'd do something like this:
queryset = Model.objects.all()
list = [] #create list
for row in queryset: #populate list
list.append({'title':row.title, 'body': row.body, 'name': row.user.username})
recipe_list_json = json.dumps(list) #dump list as JSON
return HttpResponse(recipe_list_json, 'application/javascript')
您需要导入json才能正常工作。
You need to import json for this to work.
import json
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