"reverse editing" of generic inlines in django admin - django

Question

I have a django model named Event with a generic inline relation to Relationship, like this:
# models.py
class Person(models.Model):
...
class Role(models.Model):
...
class Event(models.Model):
...
class Relationship(models.Model):
person = models.ForeignKey(Person)
role = models.ForeignKey(Role)
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
content_object = generic.GenericForeignKey("content_type", "object_id")
# admin.py
class RelationshipInline(generic.GenericTabularInline):
model = Relationship
extra = 0
class EventAdmin(admin.ModelAdmin):
inlines = [RelationshipInline]
I'd like to find a way to edit the inlines not only from the event admin page, but from the people admin page too. SO far I have added the following code to display inlines in the people page too
class ReverseRelationshipInline(admin.TabularInline):
model = Relationship
class IndividualAdmin(admin.ModelAdmin):
inlines = [ReverseRelationshipInline]
But I get content_type and object_id fields in the form and it is not very informational for admin users since it is just references to primary keys. I would rather prefer to resolve and show the content_object(even if it is not editable, to know at list to what objects are people related to).
Any direction to recommend?
Thanks.

Answer 1

Your "ReverseRelationshipInline" has to be a GenericTabularInline, not a TabularInline. That's all :-)
UPDATE
I think I now understand what you're after, and my answer is:
You won't be able to edit the content object inline of Person, but you want to show it nicely, maybe even as a link to its change form.
Add a function to Relationship which returns such an HTML link, provide your own ModelForm to your inline and specify the fields you want, which now includes your new function value (read-only). Something like this (untested):
# models.py
from django.core import urlresolvers
class Relationship(models.Model):
...
def link_content_object_changeform(self):
obj = self.content_object
change_url = urlresolvers.reverse(
'admin:%s_%s_change' % (
obj._meta.app_label,
obj._meta.object_name.lower()
),
args=(obj.id,)
)
return u'%s' % (change_url, obj.__unicode__())
link_content_object_changeform.allow_tags = True
link_content_object_changeform.short_description = 'in relation to'
# admin.py
class ReverseRelationshipInlineForm(forms.ModelForm):
class Meta:
model = Relationship
fields = ('person', 'role', 'link_content_object_changeform')
readonly_fields = ('link_content_object_changeform',)
class ReverseRelationshipInline(admin.TabularInline):
model = Relationship
form = ReverseRelationshipInlineForm