Django的不存在 [英] Django DoesNotExist
本文介绍了Django的不存在的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我在尝试计算 DoesNotExist错误时遇到问题,我试图找到管理无答案结果的正确方法,但是在 DoesNotExist或对象没有属性DoestNotExists上仍然存在问题
I am having issues on trying to figure "DoesNotExist Errors", I have tried to find the right way for manage the no answer results, however I continue having issues on "DoesNotExist" or "Object hast not Attribute DoestNotExists"
from django.http import HttpResponse
from django.contrib.sites.models import Site
from django.utils import simplejson
from vehicles.models import *
from gpstracking.models import *
def request_statuses(request):
data = []
vehicles = Vehicle.objects.filter()
Vehicle.vehicledevice_
for vehicle in vehicles:
try:
vehicledevice = vehicle.vehicledevice_set.get(is_joined__exact = True)
imei = vehicledevice.device.imei
try:
lastposition = vehicledevice.device.devicetrack_set.latest('date_time_process')
altitude = lastposition.altitude
latitude = lastposition.latitude
longitude = lastposition.longitude
date_time_process = lastposition.date_time_process.strftime("%Y-%m-%d %H:%M:%S"),
date_time_created = lastposition.created.strftime("%Y-%m-%d %H:%M:%S")
except Vehicle.vehicledevice.device.DoesNotExist:
lastposition = None
altitude = None
latitude = None
longitude = None
date_time_process = None
date_time_created = None
except Vehicle.DoesNotExist:
vehicledevice = None
imei = ''
item = [
vehicle.vehicle_type.name,
imei,
altitude,
"Lat %s Lng %s" % (latitude, longitude),
date_time_process,
date_time_created,
'',
''
]
data.append(item)
statuses = {
"sEcho": 1,
"iTotalRecords": vehicles.count(),
"iTotalDisplayRecords": vehicles.count(),
"aaData": data
}
json = simplejson.dumps(statuses)
return HttpResponse(json, mimetype='application/json')
推荐答案
我已经通过django.core.exceptions import ObjectDoesNotExist
使用ObjectDoesNotExist以这种方式找到了解决问题的方法
I have found the solution to this issue using ObjectDoesNotExist on this way
from django.core.exceptions import ObjectDoesNotExist
......
try:
# try something
except ObjectDoesNotExist:
# do something
在此之后,我的代码会按需要工作
After this, my code works as I need
谢谢,您的帖子可以帮助我解决我的问题
Thanks any way, your post help me to solve my issue
这篇关于Django的不存在的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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