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import decimal
from django.db import models
class Cash(decimal.Decimal):
currency = 'USD'
def __str__(self):
s = super().__str__(self)
return '%s %s' % (s, self.currency)
class CashField(models.DecimalField):
def __init__(self, **kwargs):
kwargs['max_digits'] = 20
kwargs['decimal_places'] = 2
super().__init__(**kwargs)
def from_db_value(self, value, expression, connection):
cash = Cash(value)
cash.vendor = connection.vendor
return cash
class CashModel(models.Model):
cash = CashField()
def __str__(self):
return str(self.cash)
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