Django ratings system

Question

I'm working on a project that needs a ratings system where they can rate the quality of the houses. They'd be doing it from the admin panel, so it's not something that a visitor would rate.

For example, for each listing, they can rate it from 1-5 stars: Location: Room: Dining options: Community: Overall:

In my models.py file, I have this setup:

Class Listing (models.Model):

...

    RATING_CHOICES = (
        (1, 1),
        (2, 2),
        (3, 3),
        (4, 4),
        (5, 5),
    )
    location_rating = models.DecimalField(choices = RATING_CHOICES, max_digits=3, decimal_places=2)
    room_rating = models.DecimalField(choices = RATING_CHOICES, max_digits=3, decimal_places=2)
    dining_options_rating = models.DecimalField(choices = RATING_CHOICES, max_digits=3, decimal_places=2)
    community_rating = models.DecimalField(choices = RATING_CHOICES, max_digits=3, decimal_places=2)
    recreation_rooms_rating = models.DecimalField(choices = RATING_CHOICES, max_digits=3, decimal_places=2)
    def __unicode__(self):
        return self.name

    def get_avg_rating(self):
        avg_rating = (self.location_rating + self.room_rating + self.recreation_rooms_rating + self.dining_options_rating + self.community_rating) / 5
        return avg_rating

I'd plan to display the ratings with a little CSS. Just putting room_rating or avg_rating in a template tag doesn't work, so I'm assuming I'd have to add some lines of code to views.py. I've checked the Django docs, but I'm still not sure how to go about this.

This seems like something that should be easy to do, but I'm not really sure where to start.

Attributes of an object need to be accessed from the object they're on. They also need to exist. — Ignacio Vazquez-Abrams, Feb 10 '11 at 02:11

score 1 · Accepted Answer · edited May 23 '17 at 11:47

A potential problem with the direction you taking is that you're only storing one set of ratings for each Listing. If user B wants to rate a Listing, he'll have to overwrite User A's ratings. Instead of putting the ratings inside the Listing, you'll need to break out your ratings into a separate Ratings table, and use a ManytoMany relationship between your Listings and Ratings. That way, you can have multiple users rate a particular listing, and then you can calculate and show the averages for each listing. See this discussion for reference.

It might be better to use an existing ratings app than starting from scratch. They already have documentation so you can get them up and running quickly, and they handle the database design for you.

Django Ratings

Django Valuate

The rating of, say, an Apartment only needs to be rated once. I suppose I could create a separate class and use ForeignKey instead of ManyToMany? The models.DecimalField is now displaying.I took out the choices option. It's displaying as 3.50, etc. Now I just need to convert that to stars. — AAA, Feb 11 '11 at 04:15

Django ratings system

1 Answers1