[Python] Django中將單筆資料轉換為json格式

官方文件：https://docs.djangoproject.com/en/dev/topics/serialization/

最基礎的使用方式：

from django.core import serializers data = serializers.serialize("json", SomeModel.objects.all())

可以指定僅序列化某些資料欄位(ex: name & size)：

from django.core import serializers data = serializers.serialize('json', SomeModel.objects.all(), fields=('name','size'))

如果我們只要序列化單筆資料，直覺是：

from django.core import serializers data = serializers.serialize("json", SomeModel.objects.get(pk=id))

不過上述是錯的，原來官方文件有這麼一段話：

The arguments to the serialize function are the format to serialize the data to (see Serialization formats) and a QuerySet to serialize. (Actually, the second argument can be any iterator that yields Django objects, but it'll almost always be a QuerySet).

是低~ 所以我們要使用filter()而不是用get()：

from django.core import serializers data = serializers.serialize("json", SomeModel.objects.filter(pk=id))

Reference: http://stackoverflow.com/questions/2255910/django-return-a-single-record-as-json