def get_extra_restriction(self, where_class, alias, remote_alias):
field = self.rel.to._meta.get_field_by_name(self.content_type_field_name)[0]
contenttype_pk = self.get_content_type().pk
cond = where_class()
lookup = field.get_lookup('exact')(Col(remote_alias, field, field), contenttype_pk)
cond.add(lookup, 'AND')
return cond
def wrapper(self, where_class, alias, lhs):
cond = func(self, where_class, alias, lhs)
from .models import PermanentModel
if not issubclass(self.model, PermanentModel) or issubclass(
where_class, AllWhereNode):
return cond
if issubclass(where_class, DeletedWhereNode):
cond = cond or ~where_class()
else:
cond = cond or where_class()
if django.VERSION < (1, 8, 0):
field = self.model._meta.get_field_by_name(settings.FIELD)[0]
else:
field = self.model._meta.get_field(settings.FIELD)
if django.VERSION < (1, 7, 0):
from django.db.models.sql.where import Constraint
if settings.FIELD_DEFAULT is None:
lookup = Constraint(lhs, settings.FIELD, field), 'isnull', True
else:
lookup = Constraint(lhs, alias,
field), 'exact', settings.FIELD_DEFAULT
else:
if django.VERSION < (1, 8, 0):
from django.db.models.sql.datastructures import Col
else:
from django.db.models.expressions import Col
if settings.FIELD_DEFAULT is None:
lookup = field.get_lookup('isnull')(Col(lhs, field, field),
True)
else:
lookup = field.get_lookup('exact')(Col(lhs, field, field),
settings.FIELD_DEFAULT)
cond.add(lookup, 'AND')
return cond