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django/tests/from_db_value/models.py
Marc Tamlyn e9103402c0 Fixed #18757, #14462, #21565 -- Reworked database-python type conversions
Complete rework of translating data values from database

Deprecation of SubfieldBase, removal of resolve_columns and
convert_values in favour of a more general converter based approach and
public API Field.from_db_value(). Now works seamlessly with aggregation,
.values() and raw queries.

Thanks to akaariai in particular for extensive advice and inspiration,
also to shaib, manfre and timograham for their reviews.
2014-09-03 20:36:03 +01:00

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741 B
Python

import decimal
from django.db import models
from django.utils.encoding import python_2_unicode_compatible
class Cash(decimal.Decimal):
currency = 'USD'
def __str__(self):
s = super(Cash, self).__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(CashField, self).__init__(**kwargs)
def from_db_value(self, value, connection):
cash = Cash(value)
cash.vendor = connection.vendor
return cash
@python_2_unicode_compatible
class CashModel(models.Model):
cash = CashField()
def __str__(self):
return str(self.cash)