Django - Admin : Editing child model without inlineForm

Question

Standard example:

class Author(models.Model):
  name = models.CharField(max_length=100)

class Book(models.Model):
  title = models.CharField(max_length=100)
  author = models.ForeignKey(Author)
  #... Many other fields ...

I'd like to edit the Books from the Author change page.
I tried with InlineModelAdmin but since Book has many fields, it's not easy to edit.
That's why I tried to put links towards the children on the author/change template.

<ul>
  <li><a href="{% url admin:content_scribpart_add %}">Add a Book</a></li>
{% for book in original.book_set.all %}
  <li><a href="{% url admin:myapp_book_change book.id %}">Edit {{ book }}</a></li>
{% endfor %}
</ul>

But there are several questions

How can I prepopulate the related Author id in the Book form
How can I make the Save button to go back to the related Author
Am I on right track ?

score 4 · Accepted Answer · edited May 23 '17 at 12:21

Yes, sure.

Append author primary key as GET parameter to your url:

<ul>
  <li><a href="{% url admin:content_scribpart_add %}?author={{ object_id }}">Add a Book</a></li>
{% for book in original.book_set.all %}
  <li><a href="{% url admin:myapp_book_change book.id %}?author={{ object_id }}">Edit {{ book }}</a></li>
{% endfor %}
</ul>

Modify the corresponding ModealAdmin for book, override response_add() and response_change(). Note that we also override formfield_for_forein_key in order to pre-populate author field:

from django.http import HttpResponseRedirect
from django.core.urlresolvers import reverse

class BookAdmin(admin.ModelAdmin):

    def formfield_for_foreignkey(self, db_field, request, **kwargs):
        if db_field.name == "author":                    
            try:
                author_pk = int(request.GET.get('author', ''),) 
            except ValueError:           
                pass
            else:
                kwargs["initial"] = Author.objects.get(pk=author_pk)

        return super(BookAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs)

    def response_add(self, request, obj, post_url_continue=None):
        return HttpResponseRedirect(reverse('admin:myapp_author_change', args=(obj.author.pk,))
        )

    def response_change(self, request, obj, post_url_continue=None):
        return HttpResponseRedirect(reverse('admin:myapp_author_change', args=(obj.author.pk,))
        )

`Author.objects.filter(pk=author_pk)` filters the select box but doesn't pre populate — Pierre de LESPINAY, Dec 08 '11 at 12:33
Finally I'm going to use `kwargs["initial"] = Author.objects.get(pk=author_pk)` instead of `kwargs["queryset"] = Author.objects.filter(pk=author_pk)` — Pierre de LESPINAY, Dec 08 '11 at 13:21
It's also `admin:myapp_author_change` instead of `admin_myapp_author_change` — Pierre de LESPINAY, Dec 08 '11 at 16:02

Django - Admin : Editing child model without inlineForm

1 Answers1