Issues with Inheritance

[KMontag42]

Hey,

I'm trying to setup some inherited documents in my db, and I'm having some issues with viewing the base class in mongoadmin.

Here is my code:
Admin.py:

class ActivityAdmin(DocumentAdmin):
    model = BaseActivity
    list_display = ('date_created', 'creator', 'targets',)

class FanActivityAdmin(DocumentAdmin):
    #model = FanActivity
    #list_display = ('date_created', 'creator', 'targets',)
    pass

class EventActivityAdmin(DocumentAdmin):
    #model = EventActivity
    #list_display = ('date_created', 'creator', 'targets',)
    pass

class VenueActivityAdmin(DocumentAdmin):
    #model = VenueActivity
    #list_display = ('date_created', 'creator', 'targets',)
    pass

class ArtistActivityAdmin(DocumentAdmin):
    #model = ArtistActivity
    #list_display = ('date_created', 'creator', 'targets',)
    pass

site.register(FanActivity, FanActivityAdmin)
site.register(EventActivity, EventActivityAdmin)
site.register(VenueActivity, VenueActivityAdmin)
site.register(ArtistActivity, ArtistActivityAdmin)
site.register(BaseActivity, ActivityAdmin)

Models.py:

class BaseActivity(BaseDocument):
    creator          = EmbeddedDocumentField('Creator')
    targets          = ListField(EmbeddedDocumentField('Target'))

    meta = {'allow_inheritance' : True, 'queryset_class' : BaseActivityManager}

class FanActivity(BaseActivity):
    #_admin_opts = BaseActivity
    pass

class ArtistActivity(BaseActivity):
    #_admin_opts = ArtistActivityAdmin
    pass
class VenueActivity(BaseActivity):
   # _admin_opts = VenueActivityAdmin
    pass
class EventActivity(BaseActivity):
    #_admin_opts = EventActivityAdmin
    pass

This is the error I get when I try to go to /mongoadmin/activity/baseactivity:
AttributeError at /mongoadmin/activity/baseactivity/
'FanActivity' object has no attribute '_admin_opts'

Now, when I try to uncomment the _admin_opts attribute to the models, here is what I get:
AttributeError at /mongoadmin/activity/baseactivity/
type object 'BaseActivity' has no attribute 'get_field_by_name'

What am I doing wrong??

Thanks for your help!

[jschrewe]

Hey,

You are probably doing nothing wrong and have met one of the untested and apparently unsupported cases :(

_admin_opts is monkey patched into the document by mongoadmin and provides a wrapper for mongoengine's meta dict because mongoengine's meta dict does not work with Django. As is get_field_by_namewhich doesn't exist in mongoengine documents but is required by Django.

I hope I can take a look at inheritance this weekend. Sadly I don't have time sooner. Till then you can either write the patch yourself or live with inheritance being unsupported. Sorry.

[KMontag42]

No problem!

Temporarily, until I figure out a better way to deal with the issue, I've just left out the BaseActivity admin and it is working fine, I can view the other records no problem.

I may end up writing the patch myself, it depends on what else comes up this week. If I do I'll obviously post my changes.

Thanks!

[jschrewe]

Posting a patch would be nice!

Cheers.