Hallo,
How could I implement forward declaration in django models?
this example wouldn't work for me:
Has anyone an idear or a solution?
This django model show a simple implementation for a bloodline app!
********************************************************************************
from django.db import models
from django.contrib.auth.models import User
from django.contrib import admin
class Parent:
pass
class Child:
pass
class AbstractUser(models.Model):
user_id = models.ForeignKey(User, blank=True)
birthday = models.DateField("birthday", blank=True, null=True)
day_of_death = models.DateField("day of death", blank=True,
null=True)
parents = models.ManyToManyField(Parent, blank=True, null=True)
childs = models.ManyToManyField(Child, blank=True, null=True)
class Parent(AbstractUser):
#user_id = models.ForeignKey(User, blank=True)
def __unicode__(self):
return "%s %s" % (self.user_id.first_name,
self.user_id.last_name)
class Child(AbstractUser):
#user_id = models.ForeignKey(User, blank=True)
def __unicode__(self):
return "%s %s" % (self.user_id.first_name,
self.user_id.last_name)
class MyUser(AbstractUser):
""" Represent a User for this site
"""
def __unicode__(self):
return "%s %s" % (self.user_id.first_name,
self.user_id.last_name)
admin.site.register(MyUser)
admin.site.register(Parent)
admin.site.register(Child)
********************************************************************************
I got this error message:
AssertionError: ManyToManyField(<class
stammbaum.bloodline.models.Parent at 0x84fc11c>) is invalid. First
parameter to ManyToManyField must be either a model, a model name, or
the string 'self'
regards
R.Klain
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