try, except problem

[Brad Rice]

I'm trying to write a try: except: to check for three things. First I want to check if an application has already been filled out, thus, check for existence. Second if it has been filled out a flag that is is complete is set to true. Then the else would be neither of those things, they need to create a new app.

This is what I have started with:

class Main(TemplateView):

    # app_started = Application.objects.get(created_by=request.user)

    @method_decorator(login_required(login_url='/accounts/login/'))

    def dispatch(self, *args, **kwargs):

        try:

            app = Application.objects.get(created_by=self.request.user)

            # if it is true check for if the app is set to complete

        except app.DoesNotExist:

            app = None

            return HttpResponseRedirect(reverse('requestform:registrant_create'))

        else:

            return HttpResponseRedirect(reverse('requestform:registrant_update'))

I keep getting this error:

local variable 'app' referenced before assignment


Why would app not be not be set if it is in the try statement?


How would I check if it does exist, to then check if the flag is true?


I'm sort of a Django newbie and this portion of the code I am writing is really mystifying me.

[Collin Anderson]

could you paste a traceback?

[Andreas Kuhne]

Hi Brad,

1. Why would app not be not be set if it is in the try statement?

Because the except parameter has the app variable in it (which it shouldn't). The correct except definition should be: "except Application.DoesNotExist". You are not looking for if the app variable doesn't exist but rather an object of type Application in the database.

2. See above :)

Med vänliga hälsningar,

Andréas Kühne

Software Development Manager

Suitopia Scandinavia AB

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[Brad Rice]

Andréas that was it. I guess I wasn't thinking about that correctly. I sure appreciate the help. This Django group is a very good group.

[Andreas Kuhne]

Glad to be of help.

Regards,

Andréas

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