This class emulates query lookups to behave as numeric operators. Inspired by SQLAlchemy.
User.objects.filter( X('username') == 'diverman' )
User.objects.filter( X('username') != 'diverman' )
User.objects.filter( X('pk') > 10 )
User.objects.filter( X('pk') >= 10 )
User.objects.filter( X('pk') < 10 )
User.objects.filter( X('pk') <= 10 )
User.objects.filter( X('username') % 'iverma' )
User.objects.filter( X('username') << 'diver' )
User.objects.filter( X('username') >> 'man' )
User.objects.filter( X('pk') | (1, 2, 3) )
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | class X(object):
def __init__(self, field):
self.field = field
def _eval(self, other, lookup):
from django.db.models import Q
return Q(**{ '%s__%s' % ( self.field, lookup ) : other })
def __eq__(self, other):
return self._eval(True, 'isnull') if other is None else self._eval(other, 'exact')
def __ne__(self, other):
return ~ ( self == other )
def __lt__(self, other):
return self._eval(other, 'lt')
def __le__(self, other):
return self._eval(other, 'lte')
def __gt__(self, other):
return self._eval(other, 'gt')
def __ge__(self, other):
return self._eval(other, 'gte')
def __mod__(self, other):
return self._eval(other, 'icontains')
def __lshift__(self, other):
return self._eval(other, 'istartswith')
def __rshift__(self, other):
return self._eval(other, 'iendswith')
def __or__(self, other):
return self._eval(other, 'in')
|
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Comments
great snippet!
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