Question

I would like to have a global variable in my django app that stores resulting list of objects that I later use in some functions and I don’t want to evaluate queryset more that once, i do it like this:

from app.models import StopWord

a = list(StopWord.objects.values_list('word', flat=True))
...

def some_func():
  ... (using a variable) ...

This seems ok to me but the problem is that syncdb and test command throw an exception:

django.db.utils.DatabaseError: (1146, "Table 'app_stopword' doesn't exist")

I don’t know how to get rid of this, may be I am on a wrong way?

Answer 1

Don’t initialize queries in a global scope. Bind None to the name, then write a function that first checks if the value is None and if so generates the data, and then returns the value.