I am building an online test taking type of application and I am
having an issue with one of my session variables...
The code looks something like this: (A lot removed for brevity)
The first time around I do the following to initialize the list:
question = Question.objects.order_by('?')[0] # Get
a random question
request.session['question_list'] = [int(question.id),]
Then on the second pass, I do the following:
questions_asked = request.session['question_list']
question = Question.objects.order_by('?')[0] # Get
a random question
request.session['question_list'] =
questions_asked.append(int(question.id))
Now this partially works. The first page of my test asks how many
questions you want and then once that is entered, it takes you to the
first question. My debugging output shows that I do indeed have a list
with the current question's ID in it. I answer the question, it takes
me to page 2. Now my debugging information shows I have two ids in my
list, the first question and this second question. Now, when I answer
this second question, I get:
AttributeError at /flight/test/
'NoneType' object has no attribute 'append'
Here is the traceback info:
Traceback (most recent call last):
File "/usr/lib/python2.4/site-packages/django/core/handlers/base.py"
in get_response
77. response = callback(request, *callback_args, **callback_kwargs)
File "/var/www/localhost/django/flight_school/knowledge_test/views.py"
in take_test
42. request.session['question_list'] =
questions_asked.append(int(question.id))
AttributeError at /flight/test/
'NoneType' object has no attribute 'append'
If I change the line that appends it to the following:
try:
request.session['question_list'] =
questions_asked.append(int(question.id))
except AttributeError:
request.session['question_list'] = [question.id,]
Again, the first two are ok, the third shows the
request.session['question_list'] contains 'None' The next question
show the previous question and the current question. Then none, then
previous question and the current question, etc....
This is with the 0.96 version. Am I doing something wrong? Should I
try to upgrade to the svn version? I am using this with apache/
mod_python but the same thing happens with the development server.
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