That looks reasonable... but I wonder if the ORM can do it directly somehow. Anyone?
On Jun 21, 10:14 am, Scott Gould <zinck...@gmail.com> wrote: > There may well be a better way to do this, especially since it's been > a good year since I was struggling with this myself. (Very similar > case to yours, different subject matter of course.) > > The way I ended up doing it was to use a template tag and some list > comprehensions to whittle things down. E.g.: > > questions = Questions.objects.all() > answers = Answers.objects.filter(candidate=my_candidate) > > questions_and_answers = [(q, [a for a in answers if a.question = q]) > for q in questions] > > ...which should give you a list of (question, <list of answers>) > tuples. > > On Jun 21, 10:00 am, JeffH <holtzma...@gmail.com> wrote: > > > To clarify: Each race has a set of questions. The candidate may have > > responded to none, some, or all. The answers are linked to the > > candidate (and to the question). For each candidate, I want to display > > all the questions, with or without answer. The way it works currently, > > only the questions with answers get displayed. > > > On Jun 21, 8:41 am, Daniel Roseman <dan...@roseman.org.uk> wrote: > > > > On Jun 21, 12:51 pm, JeffH <holtzma...@gmail.com> wrote: > > > > > I have some models that (simplified) look like the following. > > > > > class Answer(models.Model): > > > > id = models.CharField(max_length=32, primary_key=True) > > > > text = models.TextField(blank=False) > > > > question = models.ForeignKey(Question) > > > > candidate = models.ForeignKey(Candidate) > > > > > class Question(models.Model): > > > > id = models.CharField(max_length=32, primary_key=True) > > > > text = models.TextField(blank=False) > > > > > class Candidate(models.Model): > > > > id = models.CharField(max_length=32, primary_key=True) > > > > name = models.CharField(max_length=32, blank=False) > > > > > class Race(models.Model): > > > > id = models.CharField(max_length=32, primary_key=True) > > > > name = models.CharField(max_length=128, blank=False) > > > > questions = models.ManyToManyField(Question) > > > > candidates = models.ManyToManyField(Candidate) > > > > > So, a Race has Candidates and Questions, and a Candidate has Answers. > > > > Each answer is associated with a Question and a Candidate. Displaying > > > > the question associated with an answer is easy: > > > > > # context variable in view > > > > answers = Answer.objects.filter(candidate=candidate) > > > > > # template code > > > > <table> > > > > {% for answer in answers %} > > > > <tr> > > > > <td>{{answer.question.text}}</td> > > > > <td>{{answer.text}}</td> > > > > </tr> > > > > {% endfor %} > > > > </table> > > > > > From the point of view of the Candidate, I need to display all the > > > > questions, including the ones without Answers. I know how to to do > > > > this using raw sql and an outer join. How to do it in the orm? > > > > > Thanks in advance for any ideas. > > > > > --Jeff > > > > Not quite enough information here to answer. What are you wanting to > > > join? If you just want to display all the questions, why do you need a > > > join at all? > > > -- > > > DR. > > -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-us...@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.