Django how to get data from related tables?

Question

Django

There are two models

class Building(models.Model):
    name=models.CharField(max_length=32)

class Room(models.Model):
    number=models.CharField(max_length=8)
    building=models.ForeignKey(Building,on_delete=models.PROTECT)

I want to display in the admin panel
in the second table, it turns out to get data

class RoomEdit(admin.ModelAdmin):
    list_display = ('number' 'showBuilding')


    def showBuilding(self, obj):
        return "\n".join([a.name for a in obj.building.all()])

But I can't figure out how to do the same for the Building model itself

class BuildingEdit(admin.ModelAdmin):
    list_display = ('name' ..........)

    def showBuilding(self, obj):
        ........

admin.site.register(Building, showBuilding)
admin.site.register(Room, RoomEdit)

In the end, that when adding a Building, it was possible to immediately add a Room to it,
or am I stupid and there should be a ManyToMany connection here?

Answer 1

https://docs.djangoproject.com/en/4.0/ref/contrib/...