Question

I have the following model in Django:

class Feedback(models.Model):
    solution=models.ForeignKey(Solution, related_name='solution1')
    idea=models.ForeignKey(Idea,null=True, blank=True,related_name='idea1')
    idea2=models.ForeignKey(Idea, related_name='idea2') 

Given the ID of a solution how can I write a query that would retrieve me all ideas2 that have been in the feedbacks with this solution. And I am wondering is it even possible in Django. Thanks a lot!
I tried something like this, but how can I specify that I am looking for idea2, not idea1?

ideas2= Idea.objects.filter(feedback_solution1=solutionID)

Answer 1

feedbacks = list(Feedback.objects.filter(solution=solutionID).values_list('idea2__pk', flat=True))
ideas2 = Idea.objects.filter(pk__in=feedbacks)

Or

feedbacks = list(Feedback.objects.filter(solution=solutionID).values_list('idea2__pk', flat=True))
ideas2 = Idea.objects.in_bulk(feedbacks)

Check out the Performance considerations section in the Documentation.