text: from django.contrib import admin
  from .models import (Supporter, SupporterPromo, Country,
                       PromoImpressions, GeoFilter)
  
  
  DEFAULT_EXCLUDES = ['BD', 'CN', 'TF', 'GT', 'IN', 'ID',
                      'IR', 'PK', 'PH', 'RU', 'TW', 'TH', 'TR', 'UA', 'VN']
  
  
  def set_default_countries(modeladmin, request, queryset):
      for project in queryset:
          filter = project.geo_filters.create(filter_type='exclude')
          for country in Country.objects.filter(country__in=DEFAULT_EXCLUDES):
              filter.countries.add(country)
  set_default_countries.short_description = "Add default exclude countries to this Promo"
  
  
  class GeoFilterAdmin(admin.ModelAdmin):
      model = GeoFilter
      filter_horizontal = ('countries',)
  
  
  class GeoFilterInline(admin.TabularInline):
      model = GeoFilter
      filter_horizontal = ('countries',)
      extra = 0
  
  
  class SupporterAdmin(admin.ModelAdmin):
      model = Supporter
      raw_id_fields = ('user',)
      list_display = ('name', 'email', 'dollars', 'public')
      list_filter = ('name', 'email', 'dollars', 'public')
  
  
  class ImpressionInline(admin.TabularInline):
      model = PromoImpressions
      readonly_fields = ('date', 'promo', 'offers', 'views', 'clicks', 'view_ratio', 'click_ratio')
      extra = 0
      can_delete = False
      max_num = 15
  
      def view_ratio(self, instance):
          return instance.view_ratio * 100
  
      def click_ratio(self, instance):
          return instance.click_ratio * 100
  
  
  class SupporterPromoAdmin(admin.ModelAdmin):
      model = SupporterPromo
      list_display = ('name', 'display_type', 'live',
                      'click_ratio', 'sold_impressions', 'total_views')
      list_filter = ('live', 'display_type')
      readonly_fields = ('total_views',)
      inlines = [ImpressionInline, GeoFilterInline]
      actions = [set_default_countries]
  
      def view_ratio(self, instance):
          return instance.view_ratio() * 100
  
      def click_ratio(self, instance):
          return instance.click_ratio() * 100
  
      def total_views(self, instance):
          return sum(imp.views for imp in instance.impressions.all())
  
  admin.site.register(Supporter, SupporterAdmin)
  admin.site.register(SupporterPromo, SupporterPromoAdmin)
  admin.site.register(GeoFilter, GeoFilterAdmin)
  