from django.contrib.auth.models import User from django.db import models class SubscriptionManager(models.Manager): def for_user(self, user): sub, created = Subscription.objects.get_or_create(user_id=user.id) return sub class Subscription(models.Model): user = models.OneToOneField(User, blank=True, null=True) customer_id = models.CharField(max_length=36, blank=True) payment_method_token = models.CharField(max_length=35, blank=True) subscription_id = models.CharField(max_length=10, blank=True) plan_id = models.CharField(max_length=10, blank=True) objects = SubscriptionManager() def price(self): if self.plan_id == "P5": return 5 elif self.plan_id == "P20": return 20 return 0