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)