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.
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