django-tables2 ignores ManyToManyField

Question

I have these models:

class Category(models.Model):
    name = models.CharField(max_length=10)
    uuid = models.CharField(max_length=36)

class Item(models.Model):
    name = models.CharField(max_length=255)
    uuid = models.CharField(max_length=36)
    categories = models.ManyToManyField(Category, null=True)
    brand = models.ForeignKey(Brand)

I'm trying to display Item model in table with django-tables2, like this:

class ItemTable(tables.Table):
    class Meta:
        model = Item
        attrs = {"class": "paleblue"}
        fields = ("uuid", "name", "brand", "categories")

    categories = tables.Column(empty_values=())

    def render_categories(self, value):
        return ', '.join([category.name for category in value.all()])

It works fine, except the Table ignores the categories field and value parameter is equals None, and I'm getting error 'NoneType' object has no attribute 'all'

What am I doing wrong? Thanks.

Answer 1

Looks like this is bug in django-tables2 when using with django 1.7: https://github.com/bradleyayers/django-tables2/issues/211