rakkapy/nerdshope/models.py

from django.db import models
from django.utils.timezone import now

# Create your models here.
class BankAccount(models.Model):
	name=models.CharField(max_length=100)
	physical=models.CharField(max_length=100)
	currency=models.CharField(max_length=5)
	@property
	def balance(self): return sum(map(lambda x:x.amount,Payment.objects.filter(account=self)))
	
	def __str__(self):
		return str(self.name)+', '+str(self.balance)

class Payment(models.Model):
	timestamp=models.DateTimeField(default=now)
	other_party=models.CharField(max_length=100)
	account=models.ForeignKey(BankAccount, on_delete=models.CASCADE)
	amount=models.IntegerField(default=0)
	reason=models.CharField(max_length=200)
	
	def __str__(self):
		return str(self.timestamp)+', '+str(self.amount)+', '+str(self.reason)

class OffDate(models.Model):
	when=models.DateField(default=now)
	reason=models.CharField(max_length=50,default="Hall unavailable")
	
	def __str__(self):
		return str(str.when)+': '+str(self.reason)