I have following model (models.py
) in my Django project:
class Topic(models.Model):
id = models.AutoField(primary_key=True)
title = models.CharField(max_length=140)
def __unicode__(self):
return self.title
class ArgumentElement(models.Model):
id = models.AutoField(primary_key=True)
contents = models.CharField(max_length=256)
elementType = models.CharField(max_length=10)
topic = models.ForeignKey(Topic, related_name='ArgumentElement_Topic')
def __unicode__(self):
return self.contents
class ArgumentElementConnection(models.Model):
id = models.AutoField(primary_key=True)
sourceId = models.ForeignKey(ArgumentElement, related_name='connection_source')
targetId = models.ForeignKey(ArgumentElement, related_name='connection_target')
topic = models.ForeignKey(Topic, related_name='ArgumentElementConnection_Topic')
connectionType = models.CharField(max_length=7)
def __unicode__(self):
return self.id
I add all three models to the admin (admin.py
):
from django.contrib import admin
from history_site.opinions.models import ArgumentElement, ArgumentElementConnection, Topic
admin.site.register(ArgumentElement, admin.ModelAdmin)
admin.site.register(ArgumentElementConnection, admin.ModelAdmin)
admin.site.register(Topic, admin.ModelAdmin)
When I create an instance of Topic
and then try to delete it in the Admin, I get the error no such column: opinions_argumentelement.topic_id
.
What's wrong with my models.py
?
It seems that AutoFields using the sqllite3 backend don't increment properly. Is there any reason you are including the line id = models.AutoField(primary_key=True)
? If you leave it out, an auto-increment primary key field will be automatically added and is more likely to be correctly created. Try deleting that line and creating a new sqllite database file.