On Thursday 07 February 2008 14:32:09 Oleg Broytmann wrote:
> I very much hope you understand that .count() does a separate query which
> could be very expensive, and you call .count() two times!
Thank you very much for the suggestion; it's easy to change to
len(list(selectResults)).
Any ideas for how to improve the class definition syntax for my DynamicState/
DynamicSQLObject? To see the problem, below are some subclasses showing how
they're used. I'm trying to represent the US federal employers' tax. These
rules change every year, so they are well represented by DynamicState/
DynamicSQLObject.
As you can see, it's pretty unfortunate to keep cutting&pasting all those
parent/stateClass/states attributes. If anybody's got any ideas for how to
make this syntax tighter, I'd be very much obliged.
TIA,
cs
===
class TaxRule(sqlobjectextensions.DynamicState):
parent = sqlobject.ForeignKey('Tax', notNone=True)
signature = ('date',)
dontCreateTable = True
class Tax(sqlobjectextensions.DynamicSQLObject):
stateClass = TaxRule
states = sqlobject.MultipleJoin('TaxRule', joinColumn='parent_id')
dontCreateTable = True
class FlatRateTaxRule(TaxRule):
parent = sqlobject.ForeignKey('Tax', notNone=True)
rate = DecimalCol(size=6, precision=5, notNone=True)
dontCreateTable = True
class FlatRateTax(sqlobjectextensions.DynamicSQLObject):
stateClass = FlatRateTaxRule
states = sqlobject.MultipleJoin('FlatRateTaxRule', joinColumn='parent_id')
dontCreateTable = True
class MedicareRule(FlatRateTaxRule):
parent = sqlobject.ForeignKey('Medicare', notNone=True)
class Medicare(FlatRateTax):
stateClass = MedicareRule
states = sqlobject.MultipleJoin('MedicareRule', joinColumn='parent_id')
class FlatRateTaxWithCeilingRule(FlatRateTaxRule):
ceiling = CurrencyCol(notNone=True)
ceilingPeriod = ForeignKey('Periodicity', notNone=True)
dontCreateTable = True
class FlatRateTaxWithCeiling(FlatRateTax):
stateClass = FlatRateTaxWithCeilingRule
states = sqlobject.MultipleJoin('FlatRateTaxWithCeilingRule',
joinColumn='parent_id')
dontCreateTable = True
class SocialSecurityRule(FlatRateTaxWithCeilingRule):
parent = sqlobject.ForeignKey('SocialSecurity', notNone=True)
class SocialSecurity(FlatRateTax):
stateClass = SocialSecurityRule
states = sqlobject.MultipleJoin('SocialSecurityRule',
joinColumn='parent_id')
class FutaRule(FlatRateTaxWithCeilingRule):
parent = sqlobject.ForeignKey('Futa', notNone=True)
class Futa(FlatRateTaxWithCeiling):
stateClass = FutaRule
states = sqlobject.MultipleJoin('FutaRule', joinColumn='parent_id')
class EmployeeIncomeTaxRule(TaxRule):
parent = sqlobject.ForeignKey('EmployeeIncomeTax', notNone=True)
married = BoolCol(notNone=True)
payrollPeriod = ForeignKey('Periodicity', notNone=True)
minWage = CurrencyCol(notNone=True)
maxWage = CurrencyCol(notNone=True)
baseWithholding = CurrencyCol(notNone=True)
excessRate = DecimalCol(size=5, precision=4, notNone=True)
signature = ('married', 'payrollPeriod', 'date')
dontCreateTable = True
class EmployeeIncomeTax(Tax):
stateClass = EmployeeIncomeTaxRule
states = sqlobject.MultipleJoin('EmployeeIncomeTaxRule',
joinColumn='parent_id')
dontCreateTable = True
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