How should I handle admin inlines for a GenericForeignKey behind a ManyToMany relation?
===

I have a Django model which can have many generic relationships.  This is achieved by manually creating a junction model:

    class ContentProjectContentItem(models.Model):
        content_project = models.ForeignKey('ContentProject')
    
        # Generic relations via Content Type Framework
        object_id = models.PositiveIntegerField()
        content_type = models.ForeignKey(ContentType)
        item = generic.GenericForeignKey('content_type', 'object_id') 
    
        class Meta:
            unique_together = ('content_project', 'object_id', 'content_type')
            app_label = "cms"

That is related to the parent model via a ManyToManyField:

	class ContentProject(models.Model):
		title = models.CharField(max_length=100)
		date_created = models.DateTimeField(auto_now_add=True)
		
		# Related content (Assets, Resources, Media, etc)
		content_items = models.ManyToManyField(ContentProjectContentItem)

I'm still developing my skills using the Django admin, so I'm unsure of how to create an inline that will allow me to add multiple ContentProjectContentItems to a ContentProject.  I have tried using `generic.GenericStackedInline`, but to no avail:

    class ContentItemInline(generic.GenericStackedInline):
        name = "content_project"
        model = ContentProjectContentItem 

    class ContentProjectAdmin(MPTTModelAdmin):
        list_display = ('title' , 'date_created')
        search_fields = ('title' , 'date_created')
    
        inlines = [
            ContentItemInline,
        ]

I am simply seeing the standard ManyToMany multi-select for `content_items` (which is what I would expect).  I am unsure of how to make `ContentProjectAdmin` aware of the junction table's generic relationships.  Any thoughts?  