Django admin - inline inlines (or, three model editing at once)

Question

I've got a set of models that look like this:

class Page(models.Model):     title = models.CharField(max_length=255)  class LinkSection(models.Model):     page = models.ForeignKey(Page)     title = models.CharField(max_length=255)  class Link(models.Model):     linksection = models.ForeignKey(LinkSection)     text = models.CharField(max_length=255)     url = models.URLField() 

and an admin.py that looks like this:

class LinkInline(admin.TabularInline):     model = Link class LinkSectionInline(admin.TabularInline):     model = LinkSection     inlines = [ LinkInline, ] class PageAdmin(admin.ModelAdmin):     inlines = [ LinkSectionInline, ] 

My goal is to get an admin interface that lets me edit everything on one page. The end result of this model structure is that things are generated into a view+template that looks more or less like:

<h1>{{page.title}}</h1> {% for ls in page.linksection_set.objects.all %} <div>     <h2>{{ls.title}}</h2>     <ul>          {% for l in ls.link_set.objects.all %}         <li><a href="{{l.url}}">{{l.title}}</a></li>          {% endfor %}     </ul> </div> {% endfor %} 

I know that the inline-in-an-inline trick fails in the Django admin, as I expected. Does anyone know of a way to allow this kind of three level model editing? Thanks in advance.

Answer 1

You need to create a custom form and template for the LinkSectionInline.

Something like this should work for the form:

LinkFormset = forms.modelformset_factory(Link) class LinkSectionForm(forms.ModelForm):     def __init__(self, **kwargs):         super(LinkSectionForm, self).__init__(**kwargs)         self.link_formset = LinkFormset(instance=self.instance,                                          data=self.data or None,                                         prefix=self.prefix)      def is_valid(self):         return (super(LinkSectionForm, self).is_valid() and                      self.link_formset.is_valid())      def save(self, commit=True):         # Supporting commit=False is another can of worms.  No use dealing         # it before it's needed. (YAGNI)         assert commit == True          res = super(LinkSectionForm, self).save(commit=commit)         self.link_formset.save()         return res 

(That just came off the top of my head and isn't tested, but it should get you going in the right direction.)

Your template just needs to render the form and form.link_formset appropriately.

Answer 2

Django-nested-inlines is built for just this. Usage is simple.

from django.contrib import admin from nested_inlines.admin import NestedModelAdmin, NestedStackedInline, NestedTabularInline from models import A, B, C  class MyNestedInline(NestedTabularInline):     model = C  class MyInline(NestedStackedInline):     model = B     inlines = [MyNestedInline,]  class MyAdmin(NestedModelAdmin):     pass  admin.site.register(A, MyAdmin)