i am trying to implement a save function on a model class that inherits from
an abstract base class. what i am trying to do is set the field in the base
class only if it isn't already set.
i have the following:
class Base(models.Model):
attribute = models.ForeignKey('Attribute', db_index=True)
class Meta:
abstract = True
class Child1(Base):
... stuff here ...
class Child2(Base):
child1 = models.ForeignKey(Child1)
def save1(self, force_insert=False, force_update=False):
if not self.attribute:
self.attribute = self.player.attribute
super(Report, self).save(force_insert, force_update)
def save2(self, force_insert=False, force_update=False):
self.attribute = self.child1.attribute
super(Report, self).save(force_insert, force_update)
if i use save1 as my save function, i get the following:
File "/Users/greer/projects/django/...", line 346, in save if not
self.casino: File
"/Library/Python/2.5/site-packages/django/db/models/fields/related.py", line
235, in __get__ raise self.field.rel.to.DoesNotExist DoesNotExist
if i use save2 as my save function, it works just fine. however, if
attribute is already set, i don't want to override it with the attribute
from child1.
any ideas on how to set attribute only if it isn't already set?
thanks in advance,
rusty
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