Question

I am trying to define a proxy model for my admin view and have it only show objects that have a certain amount of foreign key values.

This is what I’m trying, but I’m not able to filter on yVotes:

class Post(models.Model):
    title = models.CharField(max_length=512)

class PostVote(models.Model):
    post = models.ForeignKey(Post)
    vote = models.CharField(max_length=1)

class VotedPost(models.Post):
    def _yVotes(self):
        return models.PostVote.objects.filter(post=self, vote='Y').count()
    yVotes = property(_yVotes)
    class Meta:
        proxy = True 

class VotedPostAdmin(PostAdmin):
    list_display = ('title', 'yVotes')
    def queryset(self, request):
        return self.model.objects.filter(yVotes__gt=0)

So my end result would be when you browse to /admin page for VotedPost, it would only show posts that have more than 0 ‘Y’ votes. Commenting out the queryset in VotedPostAdmin, the proper value for yVotes will display in the list_display.

Thanks in advance!

Answer 1

Here is the solution I’ve ended up with so far to get me the results I need. If anyone has a more elegant solution I will wait to accept:

class VotedPostAdmin(PostAdmin):
    list_display = ('title', 'yVotes')
    def queryset(self, request):        
    return VotedPost.objects.all().annotate(count = Count('postvote')).order_by('-count').filter(count__gt=0).filter(postvote__vote='Y')