docs: def foreign_field_func(field_name, short_description=None, admin_order_field=None): 
      """
      Allow to use ForeignKey field attributes at list_display in a simple way.
  
      Example:
          
          from misc.admin import foreign_field_func as ff
  
          class SongAdmin(admin.ModelAdmin):                                                                                                                        
              list_display = ['name', 'time', 'artist', 'album', ff('track__num', "Track number"), ff('album__total_tracks')]
      """  
      def accessor(obj): 
          val = obj 
          for part in field_name.split('__'): 
              val = getattr(val, part) 
          return val 
      
      if short_description: 
          accessor.short_description = short_description 
      else: 
          accessor.__name__ = field_name 
      if admin_order_field: 
          accessor.admin_order_field = admin_order_field 
      else: 
          accessor.admin_order_field  = (field_name,) 
      
      return accessor