Use Model Manager to filter queryset by default

How can you filter a queryset by default so that no matter where you use the model, the filter will be applied?

This can be achieved by creating a custom Manager and overriding its get_queryset method.

For example, if we have a soft delete feature in our app implemented by adding a deleted column, we can force only returing non-deleted objects by creating a custom model manager which filters for deleted=false

class BookManager(models.Manager):
    def get_queryset(self):
        return super().get_queryset().filter(deleted=False)
class Book(models.Model):
    # ...
    deleted = models.BooleanField(default=False)
    objects = BookManager()

Now everytime you query Book objects in your app with Book.objects , you will only receive books that haven't been deleted.

Links

Model managers