Question

I am having some troubles understanding the object relationships in Django. I wrote this:

 from django.db import models

class Community(models.Model):
    name = models.CharField(max_length=200) #arbitrary max length

class Category(models.Model):
    community = models.ForeignKey(Community)
    category = models.CharField(max_length=200) #arbitrary max length

class Detail_View(models.Model):
    category = models.ForeignKey(Category)
    detailView = models.CharField(max_length=200) #arbitrary max length
    website = models.CharField(max_length=200) #arbitrary max length

Each community should be able to have several Categories that are associated with it and each category should be able to have several Detail_Views associated with it. I can do what I want with Communities, but as soon as I try to add a Category or Detail View, it screws up. For example, if I say:

c = Community.objects.get(id=1)
c.category_set.create(category = "FooBar")

I get an error that says, “DatabaseError: table Content_Management_System_category has no column named category”

Answer 1

You probably haven’t run python manage.py syncdb recently, or you did but you changed some table/models.Model definitions.

Try dropping your database, creating it, and running syncdb again. That is, if you don’t have any important data in there.

You can also do python manage.py reset <appname>