DJANGO:指的是id

这里有一点给了我一个问题：错误'QuerySet'对象没有属性'address'

        bdns = Business.objects.filter(name='slow')
        addx = bdns.address
        addr = Address.objects.get(id=addx)

我该怎么办

我的商业模式：

class Business(models.Model): 
    phone = PhoneNumberField()
    address = models.ForeignKey(Address)
    name = models.CharField(max_length=64)

---

queryset是一个集合，即使该集合只包含一个元素。执行

Model.objects.filter（）

操作时，它将返回一个查询集

如果要返回单个对象，请使用

Model.objects.get（）

因此，出于您的目的：

bdns = Business.objects.filter(name='slow') # returns a collection
b = dbns[0] # get the first one
the_address = b.address # the address

# or...
try:
    bdns = Business.objects.get(name='slow') # get single instance
except Business.DoesNotExist:
    bdns = None # instance didnt exist, assign None to the variable
except Business.MultipleObjectsReturned:
    bdns = None # the query returned a collection

if bdns is not None:
    the_address = bdns.address

# the_address is an instance of an Address, so no need to do the lookup with the id

print the_address.id # 7
print the_address.street # 17 John St
print the_address.city # Melbourne

---

queryset是一个集合，即使该集合只包含一个元素。执行

Model.objects.filter（）

操作时，它将返回一个查询集

如果要返回单个对象，请使用

Model.objects.get（）

因此，出于您的目的：

bdns = Business.objects.filter(name='slow') # returns a collection
b = dbns[0] # get the first one
the_address = b.address # the address

# or...
try:
    bdns = Business.objects.get(name='slow') # get single instance
except Business.DoesNotExist:
    bdns = None # instance didnt exist, assign None to the variable
except Business.MultipleObjectsReturned:
    bdns = None # the query returned a collection

if bdns is not None:
    the_address = bdns.address

# the_address is an instance of an Address, so no need to do the lookup with the id

print the_address.id # 7
print the_address.street # 17 John St
print the_address.city # Melbourne

返回一个

QuerySet

（业务

对象的集合），您需要迭代以获取每个元素的地址

addr = Address.objects.get(id=addx)

应该有用

返回一个
QuerySet
（业务
对象的集合），您需要迭代以获取每个元素的地址

addr = Address.objects.get(id=addx)

应该可以了
@ellie请看我的编辑。一旦您有了业务，您就可以通过执行
dbns.Address
来访问地址实例。无需再查询Address类。@ellie请参阅我的编辑。一旦您有了业务，您就可以通过执行
dbns.Address
来访问地址实例。无需对Address类执行另一个查询。