Next and prev models when using django-admin-sortable. This is useful for "next" and "prev" buttons of a project detail for example

models.py

from adminsortable.models import Sortable
from django.template.defaultfilters import slugify

class Project(Sortable):
    name = models.CharField("Name", max_length=255)
    slug = models.SlugField(max_length=255, editable=False)
    
    def save(self, *args, **kwargs):
        self.slug = slugify(self.name)
        super(Project, self).save(*args, **kwargs)

template.html

<div class="navigation"><a href="{% url parent %}" class="btn pull-left back">Back</a><!-- /.btn -->
				{% if next %}
					<a href="{% url parent %}{{ next.slug }}" class="btn pull-right rm0 nav-next-item">Next</a><!-- /.btn -->
				{% endif %}
				{% if prev %}
					<a href="{% url parent %}{{ prev.slug }}" class="btn pull-right rm5 nav-prev-item">Previous</a><!-- /.btn -->
				{% endif %}
			</div>

views.py

from django.shortcuts import render_to_response
from django.template import RequestContext
from main.models import *
from django.http import Http404

def project_view(request, project_slug):
    try:
        project = Project.objects.get(slug=project_slug)
    except:
        raise Http404

    data = {'project': project}
    
    try:
        data['prev'] = Project.objects.get(order=project.order - 1)
    except:
        data['prev'] = Project.objects.get(order=Project.objects.count() - 1)
    try:
        data['next'] = Project.objects.get(order=project.order + 1)
    except:
        data['next'] = Project.objects.get(order=1)

    return render_to_response("template.html", data, context_instance=RequestContext(request))