class Ledger(models.Model):
    name = models.CharField(max_length=200)
    account_number = models.CharField(max_length=250,unique=True)
    opening_balance = models.FloatField(default=0.0)
    amount_to_pay = models.OneToOneField('Expense',on_delete=models.CASCADE)
    account_type = models.CharField(max_length=200)
    current_balance = models.FloatField(default=0.0)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
    slug = AutoSlugField(unique_with='id', populate_from='name')


class Expense(models.Model):
    pay_from = models.CharField(max_length=200)
    payment_option = models.ForeignKey(Ledger, on_delete=models.CASCADE)
    amount_to_pay = models.FloatField(default=0.0)
    expense_date = models.DateField(default=datetime.date.today)
    expense_type = models.ForeignKey(ExpenseType, on_delete=models.CASCADE)
    note = models.TextField()
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
    slug = AutoSlugField(unique_with='id', populate_from='expense_type')