old_contents: from django.contrib import admin
  from .models import Appointment, MessageTemplate, ScheduledMessage
  
  @admin.register(Appointment)
  class AppointmentAdmin(admin.ModelAdmin):
      search_fields = ('time', 'client_last_name', 'client_phone')
      list_display = ('time', 'client_last_name', 'client_phone', 'counselor_name')
      def counselor_name(self, obj):
          return obj.counselor.name
      counselor_name.short_description = 'Counselor'
  
  @admin.register(ScheduledMessage)
  class ScheduledMessageAdmin(admin.ModelAdmin):
      list_display = ('time', 'client_name', 'message_title')
      def client_name(self, obj):
          return obj.appointment.client_name
      def message_title(self, obj):
          return obj.message.title
      client_name.short_description = 'Client'
      message_title.short_description = 'Message'
      pass
  
  @admin.register(MessageTemplate)
  class MessageTemplateAdmin(admin.ModelAdmin):
      pass
  
  
new_contents: from django.contrib import admin
  from .models import Appointment, MessageTemplate, ScheduledMessage
  
  @admin.register(Appointment)
  class AppointmentAdmin(admin.ModelAdmin):
      search_fields = ('time', 'client_last_name', 'client_phone')
      list_display = ('time', 'client_last_name', 'client_phone', 'counselor_name')
      def counselor_name(self, obj):
          return obj.counselor.name
      counselor_name.short_description = 'Counselor'
  
  @admin.register(ScheduledMessage)
  class ScheduledMessageAdmin(admin.ModelAdmin):
      list_display = ('time', 'client_name', 'message_title')
      def client_name(self, obj):
          return "{} {}".format(obj.appointment.client_first_name, obj.appointment.client_last_name)
      def message_title(self, obj):
          return obj.message.title
      client_name.short_description = 'Client'
      message_title.short_description = 'Message'
      pass
  
  @admin.register(MessageTemplate)
  class MessageTemplateAdmin(admin.ModelAdmin):
      pass
  
  
subject: Fix scheduled message view