How you pass a queryset in a Django ManyToManyField. Error: int() argument must be a string, a bytes-like object or a number, not 'QuerySet'

Question

Intro: Lets say I have a Feeds model which has a user and followers. When a user writes a post. All his followers get a feed on their homepage that the person they are following wrote a post.

class Feed(models.Model):
    being_followed = models.ForeignKey(User, blank=True, null=True, related_name="feeds_for_followers")
    follower = models.ManyToManyField(User, blank=True, related_name="homepage_feeds")        
    being_followed_post = models.ForeignKey(Post, blank=True, null=True)
    created_at = models.DateTimeField(auto_now_add=True)

My issue: Now if you see the post_create view below. The user is request.user the post is the post. However I am adding followers with the code

users_followers = post_user.followers.all()
for follower in users_followers: 
    feed.follower.add(follower)

which is very inefficient. Is there a way I can add the entire queryset users_followers to the followers ManytoManyField

I tried

followers = user.followers.all()
feed.follower.add(followers)

I get the below error

int() argument must be a string, a bytes-like object or a number, not 'QuerySet'

I suggest you look into this project https://stream-framework.readthedocs.io/en/latest/ — Ochui Princewill, Jan 14 '19 at 21:59
@OchuiPrincewill thanks for the link. I am reading through them, — Samir Tendulkar, Jan 15 '19 at 03:18

score 2 · Accepted Answer · answered Jan 14 '19 at 21:54

2

You can do it like this:

users_followers = post_user.followers.all()
feed.follower.add(*users_followers)

answered Jan 14 '19 at 21:54

ruddra

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what does the * do – Samir Tendulkar Jan 14 '19 at 21:56
1

Its well explained here: https://stackoverflow.com/questions/400739/what-does-asterisk-mean-in-python :) – ruddra Jan 14 '19 at 21:57
1

awesome, thanks that worked can choose the answer correct in 8 mins. Thanks again – Samir Tendulkar Jan 14 '19 at 21:59
Just doing more research on this. I am going to use Zappa to do asynchronously do this. But according to you, this would be the fastest way correct? – Samir Tendulkar Jan 15 '19 at 02:41
Sorry, I have no idea regarding Zappa. – ruddra Jan 15 '19 at 05:42

How you pass a queryset in a Django ManyToManyField. Error: int() argument must be a string, a bytes-like object or a number, not 'QuerySet'

1 Answers1