Display relevant records from many to many in django-tables2

OK, so I have an Item class that has a many-to-many attribute to User through a 'Roles' class. I am trying to create a django-table for the Items such that out of any of the roles attached to the item, if the current User is attached to that role, the name of the role displays. I hope that makes some sort of sense. Here's what I have so far, which I didn't really expect to work because I don't see how the Table class can know about the request/user. I'm stuck.

models.py

class Item(models.Model):
    name    = models.CharField(max_length=255)
    owner   = models.ForeignKey(User, related_name='Owner')
    roles   = models.ManyToManyField(User, through='Role')
class Role(models.Model):
    role_type   = models.ForeignKey(RoleType)
    user        = models.ForeignKey(User)
    item        = models.ForeignKey(Item)

tables.py

class OwnedTable(tables.Table):
    roles = tables.Column()
    user = request.user
    def render_roles(self):
        for role in roles:
            if role.User == user:
                return role.role_type
            else:
                pass

    class Meta:
        model = Item
        attrs = {"class": "paleblue"}

        fields = ('id', 'name', 'owner', 'roles')

You can get the request object from self.context. So if you only need request.user, that's one way to do it.

class OwnedTable(tables.Table):
    roles = tables.Column(empty_values=())

    def render_roles(self):
        user = self.context["request"].user
        ...

Otherwise, @mariodev's solution works.