Newforms admin and custom widgets

[Rob Hudson]

Hello,

This is question my get long so I'll post the short version then the
longer more detailed version:

The short:
My goal is provide the user with an autocomplete AJAX widget to
quickly look up ISBNs. The ISBNs will end up in a text field in HTML
to be sent back to the backend where I'd like it split and save in the
ManyToMany field.

As a first deep foray into newforms I'm getting stuck at multiple
levels.

The long:

I have a Newsletter model with some basic fields.  I have a Special
model with FK to Newsletter and ManyToMany to books for book specials
to be included with the newsletter.  Since the Book model contains 16k
+ records the default admin for this takes forever to load and render
which makes it unusable.

I found a django snippet that I tried to adapt to create a
CommaSeparatedBooks(Field|Input) here:
http://www.djangosnippets.org/snippets/595/

>From there I'm trying to create a ModelForm from my Special model and
override the book field to use my custom Field.

Then I'm providing the FormSet to the StackedInline class to use.

At this point I'm getting an error when I load the admin:
Error while importing URLconf 'anglers.urls': 'ModelFormOptions'
object has no attribute 'many_to_many'.

So I've decided to come here for help and try to see where I've gone
astray.  See code below.

## admin.py

from django.contrib import admin
from django.db.models.fields.related import ManyToManyField
from django.newforms import ModelForm
from django.newforms.fields import Field
from django.newforms.models import modelformset_factory
from django.newforms.util import ValidationError
from django.newforms.widgets import Input
from anglers.book.models import Book
from anglers.newsletter.models import Newsletter, Special

# Widgets and Fields

class CommaSeparatedBooksInput(Input):
    input_type = 'text'
    def render(self, name, value, attrs=None):
        if value is None:
            value = ''
        elif isinstance(value, (list, tuple)):
            value = ', '.join([book.isbn for book in value])
        return super(CommaSeparatedBooksInput, self).render(name,
value, attrs)

class CommaSeparatedBooksField(Field):
    widget = CommaSeparatedBooksInput
    def clean(self, value):
        super(CommaSeparatedBooksField, self).clean(value)
        if not value:
            return ''
        if isinstance(value, (list, tuple)):
            return value
        isbns = set(value.split(','))
        isbns = set([isbn.strip() for isbn in isbns])
        books = list(Book.objects.filter(isbn__in=isbns))
        unknown_books = isbns ^ set([book.isbn_clean for book in
books])
        if unknown_books:
            raise ValidationError('Book ISBN values not found: %s' %
str(unknown_books))
        return books

# ModelForms and FormSets

class SpecialBookForm(ModelForm):
    books = CommaSeparatedBooksField()
    class Meta:
        model = Special

SpecialBookFormSet = modelformset_factory(SpecialBookForm)

# ModelAdmins with Inlines

class SpecialAdmin(admin.ModelAdmin):
    list_display = ()
    search_fields = ()
    ordering = ()

class SpecialBookInline(admin.StackedInline):
    model = Special
    formset = SpecialBookFormSet

class NewsletterAdmin(admin.ModelAdmin):
    list_display = ('start_date', 'end_date')
    ordering = ('-start_date',)
    inlines = (SpecialBookInline,)

admin.site.register(Newsletter, NewsletterAdmin)
admin.site.register(Special, SpecialAdmin)



## models.py

class Newsletter(models.Model):
    message = models.TextField()
    start_date = models.DateField(default=datetime.today)
    end_date = models.DateField()

    def __unicode__(self):
        return u"Newsletter from %s to %s"

class Special(models.Model):
    newsletter = models.ForeignKey(Newsletter)
    header = models.CharField(max_length=200, core=True)
    message = models.TextField()
    books = models.ManyToManyField(Book)

Thanks for any guidance.

-Rob
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