A Page model that represents a webpage. It uses django-html-field(edited) to allow html content and allows for multiple images to be assigned to a page. Also allows for slug to be none in the case of homepages

Page

from django.conf import settings
from django.db import models
from html_field.db.models import HTMLField
from html_field import html_cleaner
import re

cleaner = html_cleaner.HTMLCleaner(allow_tags=settings.ALLOWED_TAGS)

class Page(models.Model):
    """ A page is the overall page that can have child pages but
        doesn't have to so can be used for static pages too """

    class Meta:
        permissions = (
            ("view_api_page", "Can see page api data"),
        )

    title = models.CharField(max_length=255, help_text="""
        The page title
    """)
    slug = models.SlugField(unique=True, max_length=255, blank=True, null=True, help_text="""
        Where on the site does the page exist
    """)
    live = models.BooleanField(default=True, help_text="""
        Is the page currently live on the site?
    """)
    template = models.CharField(max_length=255,
        help_text="""
            Choose which template you would like to use for this page content
        """)
    weight = models.IntegerField(blank=True,null=True)
    parent = models.ForeignKey('Page', blank=True, null=True, related_name='subpages')
    content = HTMLField(cleaner, blank=True)

    def __unicode__(self):
        return u'%s' % self.title

    def get_absolute_url(self):
        if self.slug:
            return "/%s/" % self.slug
        else:
            return "/"

    def save(self):
        # check for a valid slug
        if self.slug:
            slug_regex = re.compile('^[-\w]+$')
            if re.match(slug_regex, self.slug):
                return super(Page, self).save()
            else:
                raise AttributeError('The slug %s is not valid, please try again' % self.slug)

def img_location(instance, filename):
    return 'page_images/story_%d/%s'%(instance.page.id, filename)


class PageImage(models.Model):
    """
    An Image that is specific to a Page
    """
    page = models.ForeignKey('Page', related_name='images')
    credit = models.CharField(max_length=200, blank=True)
    caption = models.TextField(blank=True)
    image = models.ImageField(upload_to=img_location)
    public = models.BooleanField(default=True)