Setting a preferred item of a many-to-one in Django
- by Mike DeSimone
I'm trying to create a Django model that handles the following:
An Item can have several Names.
One of the Names for an Item is its primary Name, i.e. the Name displayed given an Item.
(The model names were changed to protect the innocent.)
The models.py I've got looks like:
class Item(models.Model):
primaryName = models.OneToOneField("Name", verbose_name="Primary Name",
related_name="_unused")
def __unicode__(self):
return self.primaryName.name
class Name(models.Model):
item = models.ForeignKey(Item)
name = models.CharField(max_length=32, unique=True)
def __unicode__(self):
return self.name
class Meta:
ordering = [ 'name' ]
The admin.py looks like:
class NameInline(admin.TabularInline):
model = Name
class ItemAdmin(admin.ModelAdmin):
inlines = [ NameInline ]
admin.site.register(Item, ItemAdmin)
It looks like the database schema is working fine, but I'm having trouble with the admin, so I'm not sure of anything at this point. My main questions are:
How do I explain to the admin that primaryName needs to be one of the Names of the item being edited?
Is there a way to automatically set primaryName to the first Name found, if primaryName is not set, since I'm using inline admin for the names?
