Model field not displaying in Django Admin

Model field not displaying in Django Admin

I have a Django project hosted on heroku
I added a new slug field to model
from django.db import models
class Category(models.Model):
name = models.CharField(max_length=30)
slug = models.SlugField(unique=True)
def __unicode__(self):
return self.name
migrated it using south on heroku. Checked the heroku postgresDB as well
for added field. All fine...
Opened Admin. No slug field showing...
added slug to fields[] in admin.py. Still not showing. Here is admin.py
from django.contrib import admin from models import Category
class CategoryAdmin(admin.ModelAdmin): fields = ('name', 'slug')
admin.site.register(Category, CategoryAdmin).
I even did a heroku restart... No change. What can be done to show it ?