I’m slightly confused about what the right way is to design Django models for

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Asked: May 23, 20262026-05-23T18:20:02+00:00 2026-05-23T18:20:02+00:00

I’m slightly confused about what the right way is to design Django models for

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I’m slightly confused about what the “right way” is to design Django models for this particular use case.

I have models called Book, User, Rating. I’m designing an app that let users rate books.

Rating has a many-to-one relationship with user and a many-to-one relationship with Book.

class User(models.Model):
    name = models.CharField(max_length=30)

class Book(models.Model):
    name = models.CharField(max_length=30)

class Rating(models.Model):
    user = models.ForeignKey(User,related_name=ratings)
    book = models.ForeignKey(Book,related_name=ratings)
    ...

With this design, I can’t work out how to enforce the rule that a user can only rate each book once. I’m also not sure whether this is the right way to design models for this use case. So if I could get a few pointers in the right direction, it might help me avoid design flaws at this early stage.

Thanks in advance!