class PageAdmin(admin.ModelAdmin):

    list_display = ["id", "title", "slug", "author", 'updated', 'custom_field']

    def custom_field(self, obj):
        # logic...
        return True # or False based on above logic

class PageAdmin(admin.ModelAdmin):

    list_display = ["id", "title", "slug", "author", 'updated', 'custom_field']

    def custom_field(self, obj):
        # search on goodreads.com, parse results and match with obj.title
        return True # or False based on above logic