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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