Re: how to get parent of related m2m model instance from within a template?

http://docs.djangoproject.com/en/dev/topics/db/queries/#related-objects

On Jul 30, 12:29 pm, J <juanvio...@gmail.com> wrote:
> I have a model, which has a related model, which then has a related
> m2m field (See defs below).
>
> I want to add a method to the m2m model (ie: "Button") which, when
> called in a template, will get me the original record that called the
> relation. Is this possible? See method attempt below in the "Button"
> model, called "get_duid". The point in this attempt is to be able to
> return the original id within the template when iterating through the
> buttons of a particular "DocumentUnit".
>
> class DocumentUnit(models.Model):
>     parent      = models.ForeignKey('self', null=True, blank=True,
> related_name='children')
>     unittype    = models.ForeignKey(DocumentUnitType,
> related_name='du')
>     content     = models.TextField()
>
> class DocumentUnitType(models.Model):
>     name                = models.CharField(max_length=40)
>     description         = models.CharField(max_length=255, blank=True)
>     buttons             = models.ManyToManyField('Button', null=True,
> blank=True, related_name='button_du_types')
>
> class Button(models.Model):
>     btn_code        = models.CharField(max_length=20)
>     title           = models.CharField(max_length=50, blank=True)
>     href            = models.CharField(max_length=150, blank=True)
>     viewname        = models.CharField(max_length=50, blank=True)
>     css_class       = models.CharField(max_length=70, blank=True)
>     text            = models.CharField(max_length=50, blank=True)
>     prefix_id       = models.CharField(max_length=20)
>     order           = models.IntegerField(blank=True, null=True)
>
>     def get_duid(self):
>         return self.button_du_types.pk
>
> Thanks for any help you can give me with this.

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