File: models.py

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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()