Django Error: 'ManyToManyDescriptor' object has no attribute 'all'

Question

i am getting this error. i am trying to loop through posts to display the posts that are part of the collection. What should i change this to?

relevant info:

models.py

class Collection(models.Model):
    posts = models.ManyToManyField(Post, related_name='collection_posts', null=True, blank=True)

views.py

def collection_detail_view(request, pk):
    collection = Collection.objects.get(id=pk)
    posts = Collection.posts.all() #this is the error

    context = {
        'collection': collection,
        'posts': posts  
    }

    return render(request, 'collection_detail.html', context)

Answer 1

Your are calling all() directly to the posts field of the model. Not to the posts of the collection object. Basically you're calling your class instead of your instance.

Do the following instead:

posts = collection.posts.all() #note the lower case