papiez_ipsum/src/papiezator/models.py

from django.db import models

decimal_places = 3

class Pope(models.Model):
    path = models.CharField(max_length=200, primary_key=True)
    width = models.IntegerField()
    height = models.IntegerField()
    aspect_ratio = models.FloatField()
    pope_version = models.ForeignKey('PopeVersion')

    def __str__(self):
        return self.path.split('/')[-1]

class PopeVersion(models.Model):
    pope_id = models.CharField(max_length=8, primary_key=True)
    pope_name = models.CharField(max_length=200)

    def __str__(self):
        return self.pope_name

class PerfectPope(models.Model):
    aspect_ratio = models.FloatField(primary_key=True)
    pope = models.ForeignKey('Pope')

    def __str__(self):
        return str(self.aspect_ratio)