Django DoesNotExist

Question

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

User · Answer

The solution that i believe is best and optimized is    try      your code except  ModelName  DoesNotExist      your code

User · Answer

Nice way to handle not found error in Django  https   docs djangoproject com en 3 1 topics http shortcuts  get-object-or-404 from django shortcuts import get object or 404  def get data request       obj   get object or 404 Model  pk 1

User · Answer

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   After this  my code works as I need  Thanks any way  your post help me to solve my issue

User · Answer

This line   except Vehicle vehicledevice device DoesNotExist   means look for device instance for DoesNotExist exception  but there s none  because it s on class level  you want something like   except Device DoesNotExist

[python] Django DoesNotExist

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