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I have a get_context_data function for my DetailView Inside this function, I try to query two results. However, if the object does not exist then I get an error. If both objects don't exist, then I get two errors. I know I can do a try-except, but what if both conditions fail what is a more elegant way of catching both errors? I know I can do two try-except, but is there a better way specifically where I can make it so that the query does not return an object does not exist, instead it returns a default value?

Here's what I have:

def get_context_data(self, **kwargs):

 context = super(IndexView, self).get_context_data(**kwargs)

 try:
 vote = Voting.objects.filter(user_id=self.request.user, 
 choice__question=self.kwargs.get('pk'))
 context['voted'] = vote[0].choice.id

 context['follower'] = 
 .object.user.followers.get(follower=self.request.user)

 except:
 context['voted'] = 0

 return context

Using queryset.exists() could judge if a queryset is empty.Hope this could help.

if Voting.objects.filter(user_id=self.request.user,choice__question=self.kwargs.get('pk')).exists():
 #do your stuffs
else:
 #give it a default value

If you only want to get the first object after filtering, you can also try

• .get(): Django's .get()




• .first() :. Django's .first()

Edit: Make sure that your program is ready to deal with anonymous users and unexpected inputs,so the filter can get it's value properly.

You may try the following code, it will not output errors when either of vote , context['voted'] or context['follower'] is empty. Hope this could help.

try:
 #do your stuffs

except:
 vote = ""
 context['voted'] = ""
 context['follower'] = "" 

return context