Django Admin - Display fields for intermediate fields for M2M models

Question

We have a Django app that contains a list of newspaper articles. Each article relates m2m to both the “representative” and the “company” (the company mentioned in the article).

At the moment, the page for adding articles to create new articles is pretty close to what we want - this is just a spare Django Admin, and we use filter_horizontal to set two m2m relationships.

The next step was to add the “rating” field as an intermediate field for each m2m relationship.

So, an example of our models.py

class Article(models.Model):
    title = models.CharField(max_length=100)
    publication_date = models.DateField()
    entry_date = models.DateField(auto_now_add=True)
    abstract = models.TextField() # Can we restrict this to 450 characters?
    category = models.ForeignKey(Category)
    subject = models.ForeignKey(Subject)
    weekly_summary = models.BooleanField(help_text = 'Should this article be included in the weekly summary?')
    source_publication = models.ForeignKey(Publication)
    page_number = models.CharField(max_length=30)
    article_softcopy = models.FileField(upload_to='article_scans', null=True, blank=True, help_text='Optionally upload a soft-copy (scan) of the article.')
    url = models.URLField(null=True, blank=True, help_text = 'Enter a URL for the article. Include the protocl (e.g. http)')
    firm = models.ManyToManyField(Firm, null=True, blank=True, through='FirmRating')
    spokesperson = models.ManyToManyField(Spokeperson, null=True, blank=True, through='SpokespersonRating')

    def __unicode__(self):
        return self.title

class Firm(models.Model):
    name = models.CharField(max_length=50, unique=True)
    homepage = models.URLField(verify_exists=False, help_text='Enter the homepage of the firm. Include the protocol (e.g. http)')

    def __unicode__(self):
        return self.name

    class Meta:
        ordering = ['name']

class Spokeperson(models.Model):
    title = models.CharField(max_length=100)
    first_name = models.CharField(max_length=50)
    last_name = models.CharField(max_length=50)

    def __unicode__(self):
        return self.first_name + ' ' + self.last_name

    class Meta:
        ordering = ['last_name', 'first_name']

class FirmRating(models.Model):
    firm = models.ForeignKey(Firm)
    article = models.ForeignKey(Article)
    rating = models.IntegerField()

class SpokespersonRating(models.Model):
    firm = models.ForeignKey(Spokesperson)
    article = models.ForeignKey(Article)
    rating = models.IntegerField()

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Cheers,

Answer 1

, admin formfield_for_manytomany django.contrib.admin.options ! http://code.djangoproject.com/browser/django/trunk/django/contrib/admin/options.py#L157

ModelAdmin:

def formfield_for_manytomany(self, db_field, request=None, **kwargs):
    """
    Get a form Field for a ManyToManyField.
    """
    # If it uses an intermediary model that isn't auto created, don't show
    # a field in admin.
    if not db_field.rel.through._meta.auto_created:
        return None    # return something suitable for your needs here!
    db = kwargs.get('using')

    if db_field.name in self.raw_id_fields:
        kwargs['widget'] = widgets.ManyToManyRawIdWidget(db_field.rel, using=db)
        kwargs['help_text'] = ''
    elif db_field.name in (list(self.filter_vertical) + list(self.filter_horizontal)):
        kwargs['widget'] = widgets.FilteredSelectMultiple(db_field.verbose_name, (db_field.name in self.filter_vertical))