ruby-on-rails - Public_activity gem 参数 Rails 3

Question

我正在尝试将 Public_activity gem 与参数一起使用。

在我的控制台上:

 c = PublicActivity::Activity.find(34)
 PublicActivity::Activity Load (0.2ms)  SELECT "events".* FROM "events" WHERE     
 "events"."id" = ? LIMIT 1  [["id", 34]]
 => #<PublicActivity::Activity id: 34, trackable_id: 17, trackable_type: "Follow",   owner_id: 2, owner_type: "User", key: "follow.destroy", parameters: {:notif=>"on"},    recipient_id: nil, recipient_type: nil, created_at: "2014-08-15 04:44:03", updated_at: "2014-08-15 04:44:03"> 

如何在 PublicActivity::Activity.all 中搜索以查找包含参数[:notif] = "on"的一条记录？

实际上我的问题要简单得多...我如何使用事件记录查询来查找带有哈希值的特定记录! ？

Answer 1

gem 所有者建议添加自定义字段。通过:https://github.com/pokonski/public_activity#use-custom-fields-on-activity

"Besides the few fields that every activity has, you can also set custom fields. This could be very beneficial, as parameters are a serialized hash, which cannot be queried easily from the database."

添加自定义字段:

将自定义字段添加到事件表中:

class AddNotifFieldToActivities < ActiveRecord::Migration

  def change
    change_table :activities do |t|
      t.string :notif
    end
  end

end

在模型中分配自定义字段:

class User < ActiveRecord::Base
  include PublicActivity::Model
  tracked notif: proc {|controller, user| controller.notif }
end

现在您可以使用查询来查找 notif: on 的事件记录