Re: Extending the ManyToMany relation, maybe a bad idea

My problem is that I have multiple values and I need to associate the list of extra fields with selected relations for the ManyToMany relation. Below is a simplified version of what my setup is. 

I want to create an edit form for Organization, but I'm struggling with how best to save (and re-retrieve for display) the descr field in OrganizationItem. I don't see how adding fields to the OrganizationForm will accomplish this.

# Models

class Organization(models.Model):

    name      = models.CharField("Organization's name", max_length=100)

    items     = models.ManyToManyField(ListItem, through='OrganizationItem')

class OrganizationItem(models.Model):

    organization = models.ForeignKey(Organization)

    item       = models.ForeignKey(ListItem)

    descr      = models.TextField("Description", blank=True)

class ListItem(models.Model):

    name     = models.CharField("Name", max_length=200)

    order    = models.IntegerField("Order")

    extraInfo     = models.BooleanField("Requires extra information")

    multiLineInfo = models.BooleanField("The display should use a multi-line edit box instead of a single line edit")

    descrLabel    = models.CharField("Extra information label", max_length=50,

        blank=True)

# ModelForm

class OrganizationForm(ModelForm):    

    class Meta:

        model = Organization

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