Count Object in Models Django

Question

I have a problem with creating a modelfield which Count number of people who like an article. I have class Like:

class Reaction(models.Model):
    user = models.ForeignKey(User)
    article = models.IntegerField(null=True, blank=True)
    date = models.DateTimeField(auto_now_add=True, null=True)

and class Article:

from api.reactions.models import Reaction
class Article(models.Model):    
    user = models.ForeignKey(User)
    post = models.TextField()
    likes = models.IntegerField(default=0)

    def __str__(self):
        return self.post

    def calculate_likes(self):
        likes = Reaction.objects.count(article=self.pk)
        self.likes = likes
        self.save()
        return self.likes

But likes wont be counted. What's wrong with this? Please help me. Thanks!

In this line: article = models.IntegerField(null=True, blank=True), I use IntegerField to return article ID. — KitKit
– KitKit, Commented Nov 24, 2017 at 7:20

Samuel Omole · Accepted Answer · 2017-11-23 19:06:04Z

1

def get_likes(self):
        return self.likes.all().count()

this should basically be it, you don't need to point a model to an instance of itself, creating a reaction class is overkill. But if you are still going for it instead of:

likes = Reaction.objects.count(article=self.pk)

Try:

likes = Reaction.objects.filter(article=self.pk).count()

edited Nov 23, 2017 at 19:06

answered Nov 23, 2017 at 18:59

Samuel Omole

1851 silver badge7 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

KitKit Over a year ago

I try all your 3 solutions but it's not work. Use def is not return count. Solution 2 and 3, it came to error: name 'self' is not defined

Samuel Omole Over a year ago

u can try 'likes = Reaction.objects.filter(article__1contains=self.id).count()'

Collectives™ on Stack Overflow

Count Object in Models Django

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related