Django-MPTT full path to child pages how to make? - django-urls

Question

I'm start using Django-MPTT app to get a tree-based approach on my Django-site pages.
For ex. I have pages with sub pages:
Trance:
Vocal Trance(sub page)
Hard Trance(sub page)
Breaks:
Atmo Breaks(sub page)
Progressive Breaks(sub page)
How can I get access to them from urls.py?
What pattern will help?
Do I need to store Full_path in model or it can be done via url pattern?

Answer 1

I assume you mean you want to do URLs like this:
/trance/
/trance/vocal-trance/
/trance/hard-trace/
/breaks/
/breaks/atmo-breaks/
/breaks/progressive-breaks/
If so, it's probably best to store the url fragment in your model. Something like:
from mptt.models import MPTTModel
from django.db import models
from django.template.defaultfilters import slugify
class Page(MPTTModel):
name = models.CharField(max_length=50)
slug = models.CharField(max_length=50,null=True)
url = models.CharField(max_length=255,null=True)
def save(self, *args, **kwargs)
if self.slug is None:
# create a slug that's unique to siblings
slug = slugify(self.name)
self.slug = slug
siblings = self.get_siblings()
i = 1
while siblings.filter(slug=self.slug).exists():
i += 1
self.slug = slug + '-%d' % i
# now create a URL based on parent's url + slug
if self.parent:
self.url = '%s/%s' % (self.parent.url, self.slug)
else:
self.url = self.slug
super(Page, self).save(*args, **kwargs)
Then add a URL pattern:
(r'^pages/(?P<page_url>[\w\d_/-]+)/$', 'pages.views.show_page'),
And in your view you can just fetch the right page:
def show_page(request, page_url=None):
page = get_object_or_404(Page, url=page_url)
...

Answer 2

Thank you for your attention to my problem.
See,How I finally do it.
models.py
class WebPage(MPTTModel):
slug=RuSlugField(max_length=20,unique=True)
title=models.CharField(max_length=50)
content=models.TextField()
parent=TreeForeignKey('self',null=True,blank=True,related_name='children')
class MPTTMeta:
order_insertion_by=['slug']
def get_absolute_url(self):#TODO:: replace with get_ancestors
url = "/%s/" % self.slug
page = self
while page.parent:
url = "/%s%s" % (page.parent.slug,url)
page = page.parent
return url
urls.py
urlpatterns = patterns('website.views',
url(r"^add/$", "add_page",name="add"),
url(r"^(?P<full_slug>.*)/add/$", "add_page",name="add"),
url(r"^(?P<full_slug>.*)/edit/$", "edit_page",name="edit"),
url(r'^$', ListView.as_view(model=WebPage,template_name='index.html',context_object_name="webpages_list",),name='index'),
url(r"^(?P<full_slug>.*)/$", "page", name="page"),
)
views.py
def page(request, full_slug):
# Make a list from full_slug.
# For ex. /trance/progressive_trance/fonarev -> ['trance','progressive_trance','fonarev']
slugs=full_slug.split('/')
page=None
# Get a page by it's slug
if len(slugs)>1:
page=get_object_or_404(WebPage,slug=slugs[-1])#slugs=['trance','vocal_trance'] -> 'vocal_trance'
elif len(slugs)==1:
page=get_object_or_404(WebPage,slug=slugs[0])#slugs=['trance'] -> 'trance'
# Check if page url matches requested full_slug
if page.get_absolute_url().strip('/') == full_slug:
return render_to_response('page.html', {'page': page},context_instance=RequestContext(request))
else:
raise Http404
def edit_page(request,full_slug):
slugs=full_slug.split('/')
page=None
if len(slugs)>1:
page=get_object_or_404(WebPage,slug=slugs[-1])
elif len(slugs)==1:
page=get_object_or_404(WebPage,slug=slugs[0])
if not page.get_absolute_url().strip('/') == full_slug:
raise Http404
# Send POST data for update an existing page.Update a page.
if request.method=='POST':
form=WebPageForm(request.POST, instance=page)
if form.is_valid():
form.save()
return HttpResponseRedirect(page.get_absolute_url())
# Render a form to edit data for existing page
else:
form=WebPageForm(instance=page)
return render_to_response('edit_page.html',{'form':form,},context_instance=RequestContext(request))
def add_page(request,full_slug=None):
parent_page=None
slug=None
if full_slug:
slug=full_slug.split('/')
# If there is a slug in REQUEST(ex.'trance')->we need to add a new_page to her parent_page.
# So get a parent page.
if slug:
if len(slug)>1:
parent_page=get_object_or_404(WebPage,slug=slug[-1])
elif len(slug)==1:
parent_page=get_object_or_404(WebPage,slug=slug[0])
# Create a new_page
if request.method=='POST':
form=WebPageForm(request.POST)
if form.is_valid():
new_page=form.save(commit=False)
if parent_page:
new_page.parent=parent_page
new_page.save()
return HttpResponseRedirect(new_page.get_absolute_url())
# Return an unbounded form
else:
form=WebPageForm()
return render_to_response('add_page.html',{'form':form,},context_instance=RequestContext(request))
The trick is in we have to check if the page really exists accessing to it via full_slug:
if not page.get_absolute_url().strip('/') == full_slug:
raise Http404
Otherwise, it could be wrong allowing to check only by slug.

Answer 3

There's also a django app that will do the work for you: django-mptt-urls

Answer 4

def get_absolute_url(self):
return '/'.join([x['slug'] for x in self.get_ancestors(include_self=True).values()])