小编gue*_*eux的帖子

有没有办法在序列化Django模型类时将任何@property定义传递给json序列化程序？

例:

class FooBar(object.Model)

    name = models.CharField(...)

    @property
    def foo(self):
        return "My name is %s" %self.name

想序列化为:

[{

    'name' : 'Test User',

    'foo' : 'My name is Test User',
},]

我们假设我创建了两个模型:

class Car(models.Model):
    name =  models.CharField(max_length=50)
    size =  models.IntegerField()


class Manufacturer(models.Model):
    name =  models.CharField(max_length=50)
    country =  models.CharField(max_length=50)
    car = models.ManyToManyField(Car)

我在两个模型中添加了条目,然后我意识到每辆车只与一个独特的制造商有关.所以,我应该将ManyToManyField转换为ForeignKey:

class Car(models.Model):
    name =  models.CharField(max_length=50)
    size =  models.IntegerField()
    manufacturer = models.ForeignKey(Manufacturer)

class Manufacturer(models.Model):
    name =  models.CharField(max_length=50)
    country =  models.CharField(max_length=50)

如何在不丢失参赛作品的情况下做到这一点？我试着查看南方文档,但我没有找到这种转换方式......

操作django.db.models.Q对象的中性元素是什么|？我想生成一个带有函数的过滤器:

MyModel.objects.filter(myfunc(args)) where myfunc should give something like: "Q(foo) | Q(bar) | ... | False"

但我不知道什么是False对Q的对象.同样,我需要中性元素进行&操作(True)...

以下是此类功能的示例:

# Models
class MyModel(models.Model):
    myfield1 = models.CharField(max_length=30)
    myfield2 = models.CharField(max_length=30)


# Views
class MyView(views.View):
    model = MyModel

    def get_queryset(self):
        def myfunc(query_object_list, param):
            myfuncr = lambda l: ((myfuncr(l[1:]) | Q(**{ param: l[0] })) if l else Q(False)) # "Q(False)" would be the neutral element of operation "|" for Q objects
            return myfuncr(query_object_list) …