我有一个Django项目,用户可以在其中创建预订。
我正在使用 Tastypie 作为我向其提交简单POST
请求的API,以便在数据库中创建预留。
假设我们有这样的request
(f rom Chrome网络标签)
{passenger_name: "John", service_time_start: "12:12:12", flight_time: "12:12:12",…}
car_type: false
passenger_email: "john@gmail.com"
passenger_lastname: "Smith"
passenger_name: "John"
passenger_number: "5"
route_end: "Los Angeles"
route_start: "New York"
我在服务器端使用此代码(models.py
)。
我想使用Django Signals
为实例分配car_type。
''' Change car type for new reservation '''
@receiver(pre_save, sender=Reservation)
def smart_car_options(sender, instance, *args, **kwargs):
print 'SIGNAL: pass_no: ', instance.passenger_number
print 'SIGNAL: car_type: ', type(instance.car_type)
if instance.car_type == False:
if instance.passenger_number <= 3:
instance.car_type = 'CAR'
if 4 < instance.passenger_number <= 8:
instance.car_type = 'VAN'
if instance.passenger_number > 8:
instance.car_type = 'BUS'
print "--------------------------------------------"
print 'SIGNAL: pass_no: ', instance.passenger_number
print 'SIGNAL: car_type: ', instance.car_type
如您所见,instance.car_type
设置为'BUS'
时应设置为'VAN'
。 我做错了什么?
此外,这是我request
的控制台输出:
[20/Mar/2015 02:10:21] "POST /api/reservation/ HTTP/1.1" 201 736
[20/Mar/2015 02:10:40] "GET /forms/as_shuttle/ HTTP/1.1" 200 16237
[20/Mar/2015 02:10:52] "GET /static/debug_toolbar/css/toolbar.css HTTP/1.1" 304 0
SIGNAL: pass_no: 5
SIGNAL: car_type: <type 'bool'>
--------------------------------------------
SIGNAL: pass_no: 5
SIGNAL: car_type: BUS
[20/Mar/2015 02:11:06] "POST /api/reservation/ HTTP/1.1" 201 732
看起来passenger_number
设置正确,但 仍然为实例分配正确的值。它始终指定最后一个值'BUS'。
PS:相同的代码在django admin中正常运行。
答案 0 :(得分:2)
可能是您没有将passenger_number
转换为整数,因此比较运算符正在比较字符串和整数。
>>> "5" < 8
False
>>> "5" > 8
True
请尝试num_passengers = int(instance.passenger_number)
之类的内容,然后再与之进行比较。