old_contents: from django.contrib import admin
  
  from .models import Notebook, Housing
  
  class NotebookAdmin(admin.ModelAdmin):
      model = Notebook
  
  class HousingAdmin(admin.ModelAdmin):
      model = Housing
  
  admin.site.register(Notebook, NotebookAdmin)
  admin.site.register(Housing, HousingAdmin)
  
new_contents: from django.contrib import admin
  
  from .models import Notebook, Housing, Review
  
  class NotebookAdmin(admin.ModelAdmin):
      model = Notebook
  
  class HousingAdmin(admin.ModelAdmin):
      model = Housing
  
  class ReviewAdmin(admin.ModelAdmin):
      model = Review
  
  admin.site.register(Notebook, NotebookAdmin)
  admin.site.register(Housing, HousingAdmin)
  admin.site.register(Review, ReviewAdmin)
  
subject: Add Review admin