Hello,
I am working on a small app, based on Malcolm Tredinnick's "complex
forms" article, located at
http://www.pointy-stick.com/blog/2008/01/06/django-tip-complex-forms/.
I have a few quiz questions, where each displays its available
answers. The end result is that there are multiple Django (new) forms
within one HTML form object, as intended. However, the answers for
each quiz question are getting set to those for the last question in
the list, as shown below:
What is your quest?
Answers:
Red!
Purple!
What is your favourite colour?
Answers:
Red!
Purple!
If there is one question, the answers match up, but otherwise they're
wrong for all but the last one. My own version (his is below) just
adds a bunch of debug print statements. What I think is happening
though, is that the answers coming from the database are correct, but
the part where the fields are set appears to reference answers as a
class variable. Does this sound correct? From debug output, the
self.fields value starts off pretty much empty, then is updated OK the
first time. For the second question, the self.fields still has the
contents from the first question, until it updates it. Shouldn't this
be a separate variable instance per question?
Suggestions are welcome.
Thanks,
Tim
(code follows)
"""
Create the quiz form(s).
"""
from django import newforms as forms
from django.http import Http404
from models import Question
class QuestionForm(forms.Form):
answers = forms.ChoiceField(widget=forms.RadioSelect())
def __init__(self, question, *args, **kwargs):
super(QuestionForm, self).__init__(*args, **kwargs)
self.problem = question.problem
answers = question.answers.order_by('statement')
self.fields['answers'].choices = [(i, a.statement) for i, a in
enumerate(answers)]
# We need to work out the position of the correct answer in
the sorted
# list of all possible answers.
for pos, answer in enumerate(answers):
if answer.id == question.correct_answer_id:
self.correct = pos
break
def is_correct(self):
"""
Determines if the given answer is correct (for a bound form).
"""
if not self.is_valid():
return False
return self.cleaned_data['answers'] == str(self.correct)
def create_quiz_forms(quiz_id, data=None):
questions =
Question.objects.filter(quiz__pk=quiz_id).order_by('id')
form_list = []
for pos, question in enumerate(questions):
form_list.append(QuestionForm(question, data, prefix=pos))
if not form_list:
# No questions found, so the quiz_id must have been bad.
raise Http404('Invalid quiz id.')
return form_list
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