rails 5.2应用程序记录的json序列化不正确

Question

模型

class PushNotificationRequest < ApplicationRecord
  serialize :details

迁移

class CreateNotificationRequests < ActiveRecord::Migration[5.2]
  def change
    create_table :notification_requests do |t|
      t.references :order, references: :spree_orders, index: false
      t.string :key                             
      t.json :details                           
      t.string :type
      t.timestamps
    end
  end
end

在控制台上创建数据

PushNotificationRequest.create(order: Spree::Order.last, details: {a: 2})

Mysql奇怪的存储

mysql> select * from notification_requests;
+----+----------+------+----------------+-------------------------+-----------+---------------------+---------------------+
| id | order_id | key  | details        | type                    | status    | created_at          | updated_at          |
+----+----------+------+----------------+-------------------------+-----------+---------------------+---------------------+
|  7 |       19 | NULL | "---\n:a: 2\n" | PushNotificationRequest | INITIATED | 2019-01-09 13:45:40 | 2019-01-09 13:45:40 |
+----+----------+------+----------------+-------------------------+-----------+---------------------+---------------------+

details列被存储为一些奇怪的字符串，而不是合适的json。我使用的是MySQL8.0.12和rails 5.12

我是不是漏掉了什么？

Answer 1

根据docs Keep in mind that database adapters handle certain serialization tasks for you. For instance: json and jsonb types in PostgreSQL will be converted between JSON object/array syntax and Ruby Hash or Array objects transparently. There is no need to use serialize in this case.

serialize :details不是必需的，并且在某种程度上破坏了序列化。删除后，在mysql中获得了正确的json。

Answer 2

我认为在这种情况下，您需要定义将属性具体序列化为JSON：

class PushNotificationRequest < ApplicationRecord
  serialize :details, JSON

顺便问一下，你确定MySQL能够存储JSON吗？(我只有PostgreSQL的经验)