django-ratings

A generic ratings module. The field itself appends two additional fields on the model, for optimization reasons. It adds <field>_score, and <field>_votes fields, which are both integer fields.

Installation

You will need to add djangoratings to your `INSTALLED_APPS`:

INSTALLED_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'djangoratings',
)

Finally, run python manage.py syncdb in your appication's directory to create the tables.

Setup your models

The way django-ratings is built requires you to attach a RatingField to your models. This field will create two columns, a votes column, and a score column. They will both be prefixed with your field name:

from djangoratings import RatingField

class MyModel(models.Model):
    rating = RatingField(range=5) # 5 possible rating values, 1-5

Alternatively you could do something like:

from djangoratings import AnonymousRatingField

class MyModel(models.Model):
    rating = AnonymousRatingField(range=10)

If you'd like to use the built-in weighting methods, to make it appear more difficult for an object to obtain a higher rating, you can use the weight kwarg:

class MyModel(models.Model):
    rating = RatingField(range=10, weight=10)

Using the model API

And adding votes is also simple:

myinstance.rating.add(score=1, user=request.user, ip_address=request.META['REMOTE_ADDR'])

Retrieving votes is just as easy:

myinstance_ai.get_rating(request.user, request.META['REMOTE_ADDR'])

Accessing information about the rating of an object is also easy:

# these do not hit the database
myinstance.rating.votes
myinstance.rating.score

How you can order by top-rated using an algorithm (example from Nibbits.com source):

# In this example, `rating` is the attribute name for your `RatingField`
qs = qs.extra(select={
    'rating': '((100/%s*rating_score/(rating_votes+%s))+100)/2' % (MyModel.rating.range, MyModel.rating.weight)
})
qs = qs.order_by('-rating')

Get recent ratings for your instance:

# This returns `Vote` instances.
myinstance.rating.get_ratings()[0:5]

Get the percent of voters approval:

myinstance.rating.get_percent()

Get that same percentage, but excluding your `weight`:

myinstance.rating.get_real_percent()