I've created a very simple Django app to model a tree (like a file
system directory tree). Here's the model.py file:
from django.db import models
#
# Define constants used to control sizes of DB fields
#
MAX_NAME = 100 # Maximum size of an object's Name field
#
# Create your models here.
#
class Folder(models.Model) :
"""
This class models the Folder tree.
"""
#
# Field definitions
#
Parent = models.ForeignKey("self", null=True, verbose_name="Parent
Folder")
Name = models.CharField(maxlength=MAX_NAME)
#
# Meta options
#
class Meta :
db_table = "Folder"
#
# Admin options
#
class Admin :
pass
When I try to add my first Folder in the Admin pages it says:
"Please correct the error below.
* This field is required."
for the Parent field.
Obviously the first folder in the folder tree, or any top level
folder, will not have a Parent. I don't really want to create an
artificial top level Parent like "root". Any explanation of why this
is happening and what to do to fix it would be greatly appreciated.
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