RE: ordering queries based on most upvotes

It is difficult to follow your formatting, so I updated it below.

 

I would always avoid using GenericForeignKey().  That's my own personal preference, but it doesn't even seem like you need it in your situation.  You could just have a ForeignKey or ManyToMany directly to Activity.

 

Read more about annotation and aggregation:

https://docs.djangoproject.com/en/1.11/topics/db/aggregation/

 

This will filter only those questions that do have up votes:

Question.objects.filter(activities__activity_type=Activity.UP_VOTE).annotate(upvotes=Count('activities')).order_by('upvotes')

 

 

From: django-users@googlegroups.com [mailto:django-users@googlegroups.com] On Behalf Of Arian Hedayati Far
Sent: Wednesday, June 14, 2017 6:51 AM
To: Django users
Subject: ordering queries based on most upvotes

 

I want to order my query based on the number of upvotes but I can't figure out how to do it. It seems way too complex! ( btw am I over-complicating things?)

so here is my models.py

 

class Activity(models.Model):

 FAVORITE = 'F'

 LIKE = 'L'

 UP_VOTE = 'U'

 DOWN_VOTE = 'D'

 FOLLOW = 'W'

 REPORT = 'R'

 ACTIVITY_TYPES = ( (FAVORITE, 'Favorite'), (LIKE, 'Like'), (UP_VOTE, 'Up Vote'), (DOWN_VOTE, 'Down Vote'), (FOLLOW, 'Follow'), (REPORT, 'Report') )

 user = models.ForeignKey(User)

 activity_type = models.CharField(max_length=1, choices=ACTIVITY_TYPES)

 date = models.DateTimeField(auto_now_add=True)

 # Below the mandatory fields for generic relation

 content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)

 object_id = models.PositiveIntegerField()

 content_object = GenericForeignKey()

class Entry(models.Model):

 text = models.TextField(default='')

 time_created = models.DateTimeField(auto_now=False, auto_now_add=True)

 time_updated = models.DateTimeField(auto_now=True, auto_now_add=False)

 created_by = models.ForeignKey(User, on_delete=models.CASCADE)

 class Meta:

  abstract = True

class QuestionManager(models.Manager):

 def by_topic(self, topic): ...

 def by_recent(self): ... 

 def by_upvote_count(self):

  return self.all().order_by('-upvotes')[:5].select_related('created_by','created_by__userprofile')\

  .prefetch_related('question_comments','question_comments__reply',)

class Question(Entry):

 objects = models.Manager()

 get = QuestionManager()

 activities = GenericRelation(Activity, related_query_name='questions')

 def calculate_votes(self, type):

  return self.activities.filter(activity_type=type).count()

 up_votes = property(calculate_votes, 'U')

 down_votes = property(calculate_votes, 'D')

so, what I'm trying to do is to get by_upvote_count to return the top 5 upvoted items.

I found the Count() method of the django.db.models but could get it to work with my set up, I want to do something like this:

.Count(activities__activity_type='U') 

but obviously this doesn't work.

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