calling function in django manager object from template

Question

i am using django ratings application

into this fields.py module,i added new function to RatingManager class which is get_bayesian see below

http://github.com/dcramer/django-ratings/blob/master/djangoratings/fields.py

def get_real_rating(self):
    """get_rating()

    Returns the unmodified average rating."""
    if not (self.votes and self.score):
        return 0
    return float(self.score)/self.votes

i added this method to code

#

def get_bayesian(self):
    return 6

#

def get_rating_for_user(self, user, ip_address=None):
    """get_rating_for_user(user, ip_address=None)

    Returns the rating for a user or anonymous IP."""
    kwargs = dict(
        content_type    = self.get_content_type(),
        object_id       = self.instance.pk,
        key             = self.field.key,

)

i can't get any result when i call that function from my template all other functions are ok in template such as get_percent etc

below is template code

Score: {{profile.rating.score}}
Votes: {{profile.rating.votes}}
Real Percent: {{profile.rating.get_real_percent|floatformat}}
Percent: {{profile.rating.get_percent|floatformat}}

this call is not returning any result

Bayesian: {{profile.rating.get_bayesian|floatformat}}