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0c7633178f
Refactored compiler SELECT, GROUP BY and ORDER BY generation. While there, also refactored select_related() implementation (get_cached_row() and get_klass_info() are now gone!). Made get_db_converters() method work on expressions instead of internal_type. This allows the backend converters to target specific expressions if need be. Added query.context, this can be used to set per-query state. Also changed the signature of database converters. They now accept context as an argument.
33 lines
750 B
Python
33 lines
750 B
Python
import decimal
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from django.db import models
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from django.utils.encoding import python_2_unicode_compatible
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class Cash(decimal.Decimal):
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currency = 'USD'
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def __str__(self):
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s = super(Cash, self).__str__(self)
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return '%s %s' % (s, self.currency)
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class CashField(models.DecimalField):
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def __init__(self, **kwargs):
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kwargs['max_digits'] = 20
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kwargs['decimal_places'] = 2
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super(CashField, self).__init__(**kwargs)
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def from_db_value(self, value, connection, context):
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cash = Cash(value)
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cash.vendor = connection.vendor
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return cash
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@python_2_unicode_compatible
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class CashModel(models.Model):
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cash = CashField()
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def __str__(self):
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return str(self.cash)
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