我的Notification模型带有notification_objects参数。 Notification.first.notification_objects返回一个哈希数组。我创建了一个@notification_objects变量，用于保存具有相同键/值对的哈希数组（除了符号而不是键的字符串）。如何使用Notification找到第一个Notification.where()？在@notification_objects中对字符串进行字符串化不起作用。我正在使用Postgres 9.4和Rails 4.2。
[18] pry(main)> Notification.first.notification_objects
=> [{"class_name"=>"Ad", "ar_object_id"=>1}]
[19] pry(main)> @notification_objects
=> [{:class_name=>"Ad", :ar_object_id=>1}]
# both as_json and to_json do not work here:
[20] pry(main)> Notification.where(notification_objects: @notification_objects.as_json)
=> []
[21] pry(main)> @notification_objects.as_json
=> [{"class_name"=>"Ad", "ar_object_id"=>1}]
[22] pry(main)> Notification.first.notification_objects.as_json == @notification_objects.as_json
=> true
答案 0 :(得分：0)
您可以尝试使用.to_json代替.as_json
Notification.where(notification_objects: @notification_objects.to_json)
.to_json返回表示模型的JSON字符串。
的引用： http://apidock.com/rails/ActiveRecord/Serialization/to_json