Sub classing a self referring class with natural keys from a Base class
generates an error on dumpdata.
c:\dev\chris\bugdemo>manage.py syncdb
Creating tables ...
Creating table auth_permission
Creating table auth_group_permissions
Creating table auth_group
Creating table auth_user_user_permissions
Creating table auth_user_groups
Creating table auth_user
Creating table django_content_type
Creating table django_session
Creating table django_site
Creating table bug_template_extends
Creating table bug_template_includes
Creating table bug_template
You just installed Django's auth system, which means you don't have any
superusers defined.
Would you like to create one now? (yes/no): no
Installing custom SQL ...
Installing indexes ...
Installed 0 object(s) from 0 fixture(s)
c:\dev\chris\bugdemo>manage.py dumpdata
Error: Can't resolve dependencies for bug.Template in serialized app list.
Here's the model.
from django.db import models
class BaseManager(models.Manager):
def get_by_natural_key(self, name, date_created):
return self.get( name=name, date_created=date_created,)
class Base(models.Model):
objects = BaseManager()
date_created = models.DateTimeField(auto_now_add = True )
date_modified = models.DateTimeField(auto_now = True )
name = models.CharField(max_length = 100, default = '.')
description = models.TextField(default = '.')
class Meta:
abstract = True
unique_together = (('name','date_created'),)
ordering = ['name','date_created']
def natural_key(self):
return (self.name, self.date_created)
def __unicode__(self):
return self.name
TEMPLATE_TYPES = (
('HTML', 'HTML Text Template'),
('XML', 'XML Template'),
('TXT', 'Text Template'),
)
class Template(Base):
extends = models.ManyToManyField('self', blank = True, null =True,
related_name = 'extends_template', symmetrical = False)
includes = models.ManyToManyField('self', blank = True, null =True,
related_name = 'includes_template', symmetrical = False)
type = models.CharField(max_length = 6, choices=TEMPLATE_TYPES)
Chris
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