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import decimal
from django.db import models
class Cash(decimal.Decimal):
currency = 'USD'
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()
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