django ratings problem

Hi, 

I am trying to add django-ratings to my app and it keeps falling over when i try to add a rating. The steps i have followed is below 

1) pip install django-ratings 

2) Add 'djangoratings' to my settings.py 

3) Add a field in my model class with field name "cust_rating = RatingField(range=5)"

Now when i try to add a rating by adding the below line, system is throwing an error.

mymodel.cust_rating.add(score=int(4), user=request.user, ip_address=request.META['REMOTE_ADDR'])

Can anyone help with what i am missing?

Thanks

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