On Jul 11, 4:23 pm, derek <gamesb...@gmail.com> wrote: > On Jul 10, 4:40 pm, Rolando Espinoza La Fuente <dark...@gmail.com> > wrote: > > > > > On Sat, Jul 10, 2010 at 9:31 AM, Derek <gamesb...@gmail.com> wrote: > > > Running Django 1.2.1 under Python 2.6. > > > I am obviously missing something cruccial, but I am just not sure where > > > this > > > is... > > > I have a setup which includes a number of many-to-many models in a legacy > > > database. For example: > > > > class Grouping(models.Model): > > > id = models.AutoField(primary_key=True, db_column='GroupingID') > > > name = models.CharField(max_length=250, db_column='GroupingName', > > > unique=True) > > > class TaxAgreement(models.Model): > > > id = models.AutoField(primary_key=True, db_column='TaxID') > > > title = models.CharField(max_length=100, db_column='TaxTitle', > > > unique=True) > > > groupings = models.ManyToManyField(Grouping, > > > db_table='taxagreementgrouping') > > > Use through > > keywordhttp://docs.djangoproject.com/en/dev/ref/models/fields/#django.db.mod... > > > groupings = models.ManyToManyField(Grouping, through='TaxAgreementGrouping') > > Thanks, this fixes those problems. Unfortunately, however, it also > introduces a new error. When I try and start the app, I now get: > > ImproperlyConfigured at /admin/ > 'TaxAgreementAdmin.fieldsets[6][1]['fields']' can't include the > ManyToManyField field 'groupings' because 'groupings' manually > specifies a 'through' model. > > I need to be able to use the "many to many" box in order to create the > associations... >
As a follow-up, I see from the docs that the many to many widget _cannot_ be used in a case where "through" is specified, because the assumption is that extra fields will be added to the join model. This is _not_ the case for me, so this implies I should not have to use the "through" option to solve my original problem. [Sidebar: Interestingly, it has been suggested that it _could_, in future, be possible to do this... (see http://www.mail-archive.com/django-upda...@googlegroups.com/msg45249.html): "The fancy solution would be to loosen this condition slightly and allow an m2m field to be in the fields list (and therefore allow an m2m widget be used) *iff* the through model is just 2 foreign keys with a unique_together pairing (i.e., if the through model is exactly the same as the m2m model that is be automatically generated for the non-explicit through case)."] -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-us...@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
