django/tests/admin_widgets/widgetadmin.py

from django.contrib import admin

from .models import (
    Advisor, Album, Band, Bee, Car, CarTire, Event, Inventory, Member, Profile,
    School, User,
)


class WidgetAdmin(admin.AdminSite):
    pass


class CarAdmin(admin.ModelAdmin):
    list_display = ['make', 'model', 'owner']
    list_editable = ['owner']


class CarTireAdmin(admin.ModelAdmin):
    def formfield_for_foreignkey(self, db_field, request, **kwargs):
        if db_field.name == "car":
            kwargs["queryset"] = Car.objects.filter(owner=request.user)
            return db_field.formfield(**kwargs)
        return super().formfield_for_foreignkey(db_field, request, **kwargs)


class EventAdmin(admin.ModelAdmin):
    raw_id_fields = ['main_band', 'supporting_bands']


class AlbumAdmin(admin.ModelAdmin):
    fields = ('name', 'cover_art',)
    readonly_fields = ('cover_art',)


class SchoolAdmin(admin.ModelAdmin):
    filter_vertical = ('students',)
    filter_horizontal = ('alumni',)


site = WidgetAdmin(name='widget-admin')

site.register(User)
site.register(Car, CarAdmin)
site.register(CarTire, CarTireAdmin)

site.register(Member)
site.register(Band)
site.register(Event, EventAdmin)
site.register(Album, AlbumAdmin)

site.register(Inventory)

site.register(Bee)

site.register(Advisor)

site.register(School, SchoolAdmin)

site.register(Profile)