old_contents: from django.contrib import admin
  from roaster.models import Cafe, Roaster, Roast
  
  admin.site.register(Cafe)
  admin.site.register(Roaster)
  admin.site.register(Roast)
  
new_contents: from django.contrib import admin
  from roaster.models import Cafe, Roaster, Roast
  
  class CafeAdmin(admin.ModelAdmin):
      prepopulated_fields = {'slug': ('name',)}
      list_display = ('name', 'address', 'phone', 'url', 'created_at', 'modified_at',)
      search_fields = ('name',)
  
  class RoasterAdmin(admin.ModelAdmin):
      prepopulated_fields = {'slug': ('name',)}
      list_display = ('name', 'address', 'phone', 'url', 'created_at', 'modified_at',)
      search_fields = ('name',)
  
  class RoastAdmin(admin.ModelAdmin):
      list_display = ('name', 'created_at', 'modified_at',)
      search_fields = ('name',)
  
  admin.site.register(Cafe, CafeAdmin)
  admin.site.register(Roaster, RoasterAdmin)
  admin.site.register(Roast, RoastAdmin)
  
subject: Update the model admin list fields and search options.