Re: How do I apply a filter in a custom template tag?

Thanks, I've added a function to the Enty models. It doesn't in some cases I get good returns now. But not always.

Content is the name of the app. There is no PK-relation on the Category class, but only the below on the Entry class.

class Entry(models.Model):

    categories = models.ManyToManyField(Category, blank=True, null=True, default = None)

    def related_entries(self):

        related = Entry._default_manager.get(categories=self.categories.all())

        return related

            {% for related_entry in object.related_entries %}

                <p><a href="{{ related_entry.get_absolute_url }}">{{ related_entry.title }}</a></p>

            {% endfor %}

The related_entries work when all categories match. If there is a difference (e.g. an Entry has multiple categories) it should return none. Instead I get an error statement, which is probably because for each assigned category to the entry a row is returned. 

Caught DatabaseError while rendering: more than one row returned by a subquery used as an expression

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