class DayInline(admin.StackedInline):

    model = Day

    extra = 2

class SlotKindInline(admin.StackedInline):

    model = SlotKind

class ScheduleAdmin(admin.ModelAdmin):

    model = Schedule

    inlines = [DayInline, SlotKindInline, ]

class SlotRoomInline(admin.TabularInline):

    model = SlotRoom

    extra = 1

class SlotAdmin(admin.ModelAdmin):

    list_filter = ("day", "kind")

    list_display = ("day", "start", "end", "kind", "content")

    inlines = [SlotRoomInline, ]

class RoomAdmin(admin.ModelAdmin):

    inlines = [SlotRoomInline, ]

class PresentationAdmin(admin.ModelAdmin):

    model = Presentation

    list_filter = ("section", "cancelled", "slot")

admin.site.register(Schedule, ScheduleAdmin)

admin.site.register(Room, RoomAdmin)

admin.site.register(Slot, SlotAdmin)

admin.site.register(Presentation, PresentationAdmin)