如何将私人提交与活动提要一起使用？

Question

我们如何为用户提供将活动设为私有的选项？这将为用户提供他们想要的帖子的隐私权。

我被告知此代码不起作用，因为它可能与 "not setting up the 'private' checkbox to work correctly" 有关，但私人复选框适用于 hiding submissions on the public profiles（只是不在活动提要上）。

class ActivitiesController < ApplicationController
  def index #Added .public
    @activities = Activity.visible.order("created_at desc").where(user_id: current_user.following_ids)
  end
end


class Activity < ActiveRecord::Base
  belongs_to :user
  has_many :comments, as: :commentable
  belongs_to :trackable, polymorphic: true
  scope :visible, ->{ where(:hidden => false) }

  def visible?
    !hidden
  end
end

create_table "activities", force: true do |t|
  t.boolean "hidden", default: false
  t.integer  "user_id"
  t.string   "action"
  t.integer  "trackable_id"
  t.string   "trackable_type"
  t.datetime "created_at",     null: false
  t.datetime "updated_at",     null: false
end

在@valuations 或@goals 等_forms 之一中，用户可以通过提交进行区分：

 <%= button_tag(type: 'submit', class: "btn", id: "gold")  do %>
   <span class="glyphicon glyphicon-plus"></span> Public
 <% end %>

 <%= button_tag(type: 'submit', class: "btn") do %>
   <% :hidden %><span class="glyphicon glyphicon-plus"></span> Private
 <% end %>

谢谢！

Answer 1

我会改用enum 列。枚举为您提供了大量的功能，例如范围、询问甚至 bang 方法来更改状态。但是大多数枚举都是为扩展而构建的——假设你想添加用户可以拥有只有朋友可以查看的帖子的功能——向枚举添加额外的状态很容易！

首先我们添加一个数据库列。运行：

rails g migration AddVisiblityToActivities visibility:integer:index

然后编辑迁移以添加默认值：

class AddVisibilityToActivities < ActiveRecord::Migration
  def change
    t.integer :visibility, index: true, default: 0
  end
end

使用rake db:migrate 运行迁移。然后我们需要将枚举映射添加到 Activity 模型中：

class Activity < ActiveRecord::Base
  belongs_to :user
  has_many :comments, as: :commentable
  belongs_to :trackable, polymorphic: true

  # change the order if you want to default to private!
  enum visibility: [:visible, :hidden]

  default_scope { visible.order('created_at DESC') }
end

请注意，我们还添加了默认范围。这样我们就可以真正简化控制器中的查询：

class ActivitiesController < ApplicationController
  def index #Added .public
    @activities = Activity.where(user: current_user.following)
    # note that you don't have to use ids when creating a
    # where clause from an association. Rails does the work for you
  end
end

让用户在创建/更新记录时更改可见性的最简单方法是使用选择：

<div class="field">
  <%= f.label :visibility %>
  <%= f.select :visibility, Activity.visibilities.keys.map(&:titleize) %>
</div>

请记住将visibility 属性列入白名单！

# app/controllers/activities_controller.rb

# ...

def create
  @activity = Activity.new(activity_params) do |a|
    a.user = current_user
  end

  # ...
end

# ...

def activity_params
  params.require(:activity).permit(:visibility)
end