_set in Django for a queryset

by

What you are seeing is a reverse related object lookup.

In your example:

class Blog(models.Model):
    pass

class Entry(..):
    blog = Blog(..)

Now, given object e of type Entry, you would do e.blog to access the related object Blog – which is a forward relation.
The _set is a reverse lookup class variable django puts in for you.

So, given object b – you would do:

entries = b.entry_set.all()

The reason the reverse is a queryset is, ForeignKey is 1-to-many relationship. Hence, the reverse is a queryset.

The _set object is made available when related_name is not specified.

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