I have a Question Model with a ForeignKey field (answer) and a
ManyToManyField (choices) that link to the same model (Choice).
When I create a question I create a new Choice object for the answer field
but that option does not show up for the choices field.
I don't want to have to cancel the creation of a Question so that I can
select the same Choice object for both answer and choices.
So I either need the choices field to have the Choice option created form
the answer field or I need to make sure that the answer Choice is an option
in the choices field.
#models.pyclass Choice(models.Model):
choice = models.CharField(max_length=64)
def __unicode__(self):
return self.choice
#multiple choice questionclass Question(models.Model):
question = models.CharField(max_length=64)
answer = models.ForeignKey('Choice', related_name='is_answer_for')
choices = models.ManyToManyField(Choice, related_name='questions',
verbose_name='other choices')
module = models.ForeignKey('Module', related_name='questions')
times_correct = models.IntegerField(editable=False, default=0)
times_total = models.IntegerField(editable=False, default=0)
def _get_average(self):
"Returns the average in percent"
if self.times_total != 0:
return (self.times_correct / float(self.times_total))*100
return 0.0
average = property(_get_average)
def save(self, *args, **kwargs):
super(Question, self).save(*args, **kwargs)
#make sure that the answer is also in choices
if self.answer not in self.choices.all():
self.choices.add(self.answer)
super(Question, self).save(*args, **kwargs)
def __unicode__(self):
return self.question
#The code should work>>> from quiz.models import *>>> q =
Question.objects.get(id=1)
#I created q with the above model and as you can see it doesn't work>>> print
q.answer not in q.choices.all()True>>> q.choices.add(q.answer)>>> print
q.answer not in q.choices.all()False
I added the save above because it complained that the question field needed to
have a value, which I don't really understand because it is a CharField
"needs to have a value for field "question" before this many-to-many
relationship can be used."
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