Mezzanine models

admin.py

from django.contrib import admin
from mezzanine.core.admin import StackedDynamicInlineAdmin
from mezzanine.pages.admin import PageAdmin

from helios3d.sponsors.models import Sponsor, SponsorCategory, SponsorPage

from copy import deepcopy

sponsor_admin_fieldsets = deepcopy(PageAdmin.fieldsets)
sponsor_admin_fieldsets[0][1]['fields'].insert(-3, 'categories')
sponsor_admin_fieldsets[0][1]['fields'].append('content')

class SponsorAdmin(admin.ModelAdmin):
	list_display = ['title', 'website']
	search_field = ['title', 'description']

	fields = ['title', 'logo', 'website', 'content'] 

class SponsorAdminInline(StackedDynamicInlineAdmin):
	model = Sponsor
	extra = 1
	fields = ['title', 'logo', 'website', 'content'] 

class SponsorCategoryAdmin(admin.ModelAdmin):
	list_display = ['title']
	search_fields = ['title']

	fields = ['title']

	inlines = (SponsorAdminInline,)

class SponsorPageAdmin(PageAdmin):
	fieldsets = sponsor_admin_fieldsets


admin.site.register(Sponsor, SponsorAdmin)
admin.site.register(SponsorCategory, SponsorCategoryAdmin)
admin.site.register(SponsorPage, SponsorPageAdmin)
	

models.py

from mezzanine.core.models import Slugged, Orderable, RichText
from mezzanine.core.fields import FileField
from mezzanine.pages.models import RichTextPage
from mezzanine.utils.models import AdminThumbMixin

from django.db import models
from django.utils.translation import ugettext_lazy as _

class SponsorCategory(Orderable, Slugged):
	"""
		Represents a sponsor category (like Platinum, Gold, etc.)
	"""

	class Meta:
		verbose_name = _("Category")
		verbose_name_plural = _("Categories")

class Sponsor(Orderable, Slugged, RichText, AdminThumbMixin):
	"""
		Represents an actual sponsor
	"""

	category = models.ForeignKey(SponsorCategory, related_name="sponsors")
	website = models.CharField(max_length=255)
	logo = FileField(upload_to="sponsor_logos", format="Image", max_length=255)

	admin_thumb_field = "logo"
	
class SponsorPage(RichTextPage):
	"""
		Represents the page with all sponsors
	"""

	categories = models.ManyToManyField(SponsorCategory, related_name="%(class)s_pages")

	def get_categories_and_sponsors(self):
		return self.categories.select_related(depth=1)

Change:

class SponsorPage(RichTextPage):

To:

class SponsorPage(Page, RichText):