history admin dropdown for admin

history/admin.py

@@ -1,12 +1,16 @@
 from django.contrib import admin
 
+from django_admin_listfilter_dropdown.filters import RelatedDropdownFilter, ChoiceDropdownFilter
+
 from . import models
 
 # Register your models here.
 
 class HistoryAdmin(admin.ModelAdmin):
     list_display = ('company_name', 'rss_url', 'sync_date', 'result', 'quantity',)
-    list_filter = ('company__company_name',)
+    list_filter = (
+        ('company', RelatedDropdownFilter),
+    )
 
     def company_name(self, instance):
         if instance.company and instance.company.company_name: