我创建了这个简单的项目来说明我的问题。
这些是我的模型:
class Zoo(models.Model):
name = models.CharField(max_length=30)
class Animal(models.Model):
name = models.CharField(max_length=30)
zoo = models.ForeignKey(Zoo)
def speak(zelf):
return 'woof woof'
这是我的基本处理程序:
class ZooHandler(BaseHandler):
fields = ('id', 'name', 'speak')
def read(self, request):
z = Zoo.objects.get(pk=1)
qs = z.animal_set.all()
return qs
如果我不将查询集转换为列表,这是结果:
[
{
"id": 1,
"name": "Tiger",
"speak": "woof woof"
},
{
"id": 2,
"name": "Panda",
"speak": "woof woof"
},
{
"id": 3,
"name": "Bear",
"speak": "woof woof"
},
{
"id": 4,
"name": "Parrot",
"speak": "woof woof"
},
{
"id": 5,
"name": "Dolphin",
"speak": "woof woof"
}
]
如果我将它转换为列表,就会发生这种情况return list(qs)
:
[
{
"zoo_id": 1,
"_state": "<django.db.models.base.ModelState object at 0x2413f90>",
"id": 1,
"name": "Tiger"
},
{
"zoo_id": 1,
"_state": "<django.db.models.base.ModelState object at 0x241d590>",
"id": 2,
"name": "Panda"
},
{
"zoo_id": 1,
"_state": "<django.db.models.base.ModelState object at 0x241d6d0>",
"id": 3,
"name": "Bear"
},
{
"zoo_id": 1,
"_state": "<django.db.models.base.ModelState object at 0x241d750>",
"id": 4,
"name": "Parrot"
},
{
"zoo_id": 1,
"_state": "<django.db.models.base.ModelState object at 0x241d7d0>",
"id": 5,
"name": "Dolphin"
}
]
我失去了 speak 方法的结果,但获得了一个关系 id 和一个 _state 对象。谁能解释为什么会发生这种情况以及我如何防止它?这只是一个测试项目,我不想让任何人试图解释我的真实项目。