Have spent quite a few hours on this one but not familiar enough with
django inerds to make much progress.
Here is the model:
class Stuff(models.Model):
name = models.CharField(max_length=140)
parent = models.ForeignKey('self', null=True, blank=True,
related_name='children')
mptt.register(Stuff)
class ToDo(Stuff):
status = models.CharField(_('status'), max_length=1,
choices=STATUS_CHOICES, default=1)
class Concept(Stuff):
priority = models.CharField(_('status'), max_length=1,
choices=PRIORITY_CHOICES,
default='C')
And the code where I am saving (tried many different options!)
obj = ToDo(**field_vals)
obj.tags = " ".join(set(self.keyw_used))
obj.save()
# add parent
if self.parent:
obj.move_to(self.parent)
obj.save()
Am getting the error 'Options' object has no attribute 'parent_attr'
when trying to add to ToDo.
Error occurring here:
def is_root_node(self):
return getattr(self, '%s_id' % self._meta.parent_attr) is None
This is because the ToDo model is not in the mptt registery.
I tried adding an attribute to register to say it was inherited so
that the __init__ method of mptt would add the ToDo and Concept models
to the registry but not all the fields. ie.
in models:
mptt.register(Stuff)
mptt.register(ToDo, inherited=True)
mptt.register(Concept, inherited=True)
and hacked __init__:
if model in registry:
raise AlreadyRegistered(
_('The model %s has already been registered.') %
model.__name__)
registry.append(model)
#added by PHB
if not inherited:
# Add tree options to the model's Options
opts = model._meta
opts.parent_attr = parent_attr
opts.right_attr = right_attr
This got me past the first error but it's still putting the mptt
fields in the _meta of the ToDo model and failing in the models
pre_save with:
AttributeError: 'ToDo' object has no attribute 'lft'
I need to find some way of telling django these fields are in the
parent class and not the child. Any suggestions very welcome as way
out of my depth there!
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