ruby-on-rails - Rails 合并多个 json 响应

Question

谁能帮我解决这个问题？

所以，问题来了，我想合并这个查询响应:

 @energy = Alert.where(["alert_type = ?", "Energy"]).last.as_json

 @cost = Alert.where(["alert_type = ?", "Cost"]).last.as_json

然后我将这些对象与:

@current_notif = @energy.merge(@cost)

但是那些只是给我这样的@cost对象:

{
  "alert_type": "Cost",
  "value": 30000000,
  "status": "Cost exceeds limit",
  "created_at": "2017-06-03T15:31:21.156+07:00",
  "updated_at": "2017-06-03T15:31:21.156+07:00",
  "home_id": 2
}

而不是像这样合并的@energy + @cost:

    { {"alert_type": "Energy",
       "value": 384455.813978742,
       "status": "Energy too high",
       "created_at": "2017-05-31T11:31:12.907+07:00",
       "updated_at": "2017-05-31T11:31:12.907+07:00",
       "home_id": 2 },
     {
       "alert_type": "Cost",
       "value": 30000000,
       "status": "Cost exceeds limit",
       "created_at": "2017-06-03T15:31:21.156+07:00",
       "updated_at": "2017-06-03T15:31:21.156+07:00",
       "home_id": 2
     }
}

Answer 1

如果你愿意，你可以“加入”这两个值，然后在上面使用 as_json:

[@energy, @cost].as_json
# [{"alert_type": "Energy", ... }, {"alert_type": "Cost", ... }]

或者，如果您愿意，可以使用 IN 表达式来处理 ActiveRecord 而不必自定义结果，这会为您提供:

Alert.where(alert_type: ['Energy', 'Cost']).as_json
# [{"alert_type": "Energy", ... }, {"alert_type": "Cost", ... }]