old_contents: from django.contrib import admin
  from shipping.modules.tieredweight.models import Carrier, WeightTier, Zone, ZoneTranslation
  from shipping.modules.tieredweight.forms import CarrierAdminForm, ZoneAdminForm
  
  
  class WeightTierInline(admin.TabularInline):
      model = WeightTier
  
  
  class ZoneTranslationInline(admin.TabularInline):
      model = ZoneTranslation
  
  
  class CarrierOptions(admin.ModelAdmin):
      fieldsets = (
          (None, {
              'fields': ('name', 'default_zone')
          }),
          ('Advanced options', {
              'classes': ('collapse',),
              'fields': ('active', 'ordering')
          }),
      )
      list_display = ['name', 'active', 'default_zone']
      form = CarrierAdminForm
  
  
  class ZoneOptions(admin.ModelAdmin):
      list_filter = ['carrier',]
      list_display = ['carrier', 'name']
      filter_horizontal = ('countries',)
      inlines = [WeightTierInline, ZoneTranslationInline]
      form = ZoneAdminForm
  
  
  admin.site.register(Carrier, CarrierOptions)
  admin.site.register(Zone, ZoneOptions)
new_contents: from django.contrib import admin
  from nogroth.models import Carrier, WeightTier, Zone, ZoneTranslation
  from nogroth.forms import CarrierAdminForm, ZoneAdminForm
  
  
  class WeightTierInline(admin.TabularInline):
      model = WeightTier
  
  
  class ZoneTranslationInline(admin.TabularInline):
      model = ZoneTranslation
  
  
  class CarrierOptions(admin.ModelAdmin):
      fieldsets = (
          (None, {
              'fields': ('name', 'default_zone')
          }),
          ('Advanced options', {
              'classes': ('collapse',),
              'fields': ('active', 'ordering')
          }),
      )
      list_display = ['name', 'active', 'default_zone']
      form = CarrierAdminForm
  
  
  class ZoneOptions(admin.ModelAdmin):
      list_filter = ['carrier',]
      list_display = ['carrier', 'name']
      filter_horizontal = ('countries',)
      inlines = [WeightTierInline, ZoneTranslationInline]
      form = ZoneAdminForm
  
  
  admin.site.register(Carrier, CarrierOptions)
  admin.site.register(Zone, ZoneOptions)
  
subject: fix paths in admin.py