django-refunds/refunding/models.py

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from django.db import models
from django.conf import settings
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from django.db.models import Sum
AUTH_USER_MODEL = getattr(settings, 'AUTH_USER_MODEL', 'auth.User')
class Refund(models.Model):
title = models.CharField(max_length=100)
date = models.DateField()
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
user = models.ForeignKey(
AUTH_USER_MODEL,
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on_delete=models.PROTECT,
null=True
)
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def eur_value(self) -> float:
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value_sum = self.payment_set.all().aggregate(Sum('value')).get('value__sum')
if value_sum:
return value_sum / 100
else:
return 0
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def __str__(self) -> str:
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return "{0} on {1} for {2}".format(self.title, self.date, self.eur_value())
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class Payment(models.Model):
title = models.CharField(max_length=100)
date = models.DateField()
value = models.IntegerField()
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
user = models.ForeignKey(
AUTH_USER_MODEL,
on_delete=models.PROTECT
)
refund = models.ForeignKey(
Refund,
on_delete=models.SET_NULL,
null=True,
blank=True
)
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def __str__(self) -> str:
return '{0} on {1} for {2}'.format(self.title, self.date, self.value / 100)
def eur_value(self) -> float:
return self.value / 100