和Django

我試圖找到一個解決這個錯誤我不斷收到PostgreSQL的DatabaseError柱：和Django

列posts_post.slug不存在

LINE 1：選擇「posts_post」，「ID」。，「posts_post」，「title」，「posts_post」...

有沒有人知道可能是什麼原因造成的？

from django.db import models 
    from django.contrib.auth.models import User 
    from datetime import datetime 

    class Category(models.Model): 
    name = models.CharField(max_length=60) 
    def __unicode__(self): 
     return self.name 

    class Tags(models.Model): 
    name = models.CharField(max_length=60) 
    def __unicode__(self): 
     return self.name 

    class Post(models.Model): 
    title = models.CharField(max_length=120) 
    slug = models.SlugField(max_length=120, unique=True) 
    description = models.TextField() 
    body = models.TextField() 
    published = models.DateTimeField(default=datetime.now) 
    categories = models.ForeignKey(Category) 
    tags = models.ManyToManyField(Tags) 
    def __unicode__(self): 
     return self.title 
    class Meta: 
     ordering = ['-published'] 
    def get_absolute_url(self): 
     return "/%s/%s/%s" % (self.published.year, self.published.month, self.slug)

來源

2012-10-13 Chris Frank