blechreiz-website/musicians/admin.py

from django.contrib import admin
from django.contrib.auth.admin import UserAdmin
from django.contrib.auth.models import User
from django.utils.translation import ugettext as _
from musicians.models import Musician
# from eventplanner.admin import EventParticipationInline


# Define an inline admin descriptor for Musician model
# which acts a bit like a singleton
class MusicianInline(admin.StackedInline):
    model = Musician
    can_delete = False
    verbose_name_plural = _('musicians')
    verbose_name = _('musician')


# Define a new User admin
class UserAdmin(UserAdmin):
    inlines = (MusicianInline,)


class MusicianAdmin(admin.ModelAdmin):
    readonly_fields = ('user',)
    # inlines = ( EventParticipationInline, )
    model = Musician


# Re-register UserAdmin
admin.site.unregister(User)
admin.site.register(User, UserAdmin)
admin.site.register(Musician, MusicianAdmin)