gistfile1.py

from django.contrib.gis.db import models
from django.contrib.auth.models import User
from django.conf import settings

auto_approve_comments = getattr(settings, 'COMMENTS_AUTO_APPROVE', True)

class Place(models.Model):
    """ For maintaining a database of different places. """

    location = models.PointField()
    name = models.CharField(max_length=128)

class CommentAttachment(models.Model):
    """ A base class for attachment centralization. """

    pass

class ImageCommentAttachment(CommentAttachment):
    """ An attachment which represents an image. """

    image = models.ImageField() # Using ImageKit here is more awesometastic.

class LocationAttachment(CommentAttachment):
    """ A simple attachment which lets you attach a place to your post. """

     place = models.ForeignKey(Place)

class Comment(models.Model):
    """ A comment. """

    text = models.TextField('Your comments')

    author = models.ForeignKeyField(User)
    published = models.BooleanField(default=auto_approve_comments)

    attachments = models.ManyToManyField(CommentAttachment)

    # This implies a parent->child relationship, which can be used to reprsent
    # threaded replies in your comments. Consider using an MPTT application to
    # help reduce queries.
    reply_to = models.ForeignKey('self', null=True)

    # relate to your products here, or - even better - use generic relations.