ruby-on-rails - Rails 4 - 在 jsonb 列中动态添加嵌套 json 数据

Question

在我的 Ruby on Rails 4 应用程序中，我有一个名为“deals_usage”的 jsonb 列。

我想设置以下内容:

• 创建时

  deals_usage= { }   
  

• 当用户加载 deal number2 View (作为示例)时，属性值会更改当前用户的 deal_usage 值

  deals_usage= {
     { Deal 2 = { clicks_performed_by_user = 0, purchases_performed_by_user= 0 }
   }
  

• 然后，如果用户点击交易中的某些内容，属性值将更改为:

  deals_usage= {
     { Deal 2 = {clicks_performed_by_user = 1, purchases_performed_by_user= 0 }
  }
  

因此，如果用户通过 1 次点击参与交易 2，并通过 1 次购买参与交易 5，则 deal_usage 将为。

     deals_usage={ 
         { Deal 2 = { clicks_performed_by_user = 1, purchases_performed_by_user= 0},
           Deal 5 = {clicks_performed_by_user = 0, purchases_performed_by_user= 1}
      }

注意:增量只能是 +1 。如果用户点击:点击+=1，如果用户购买，则购买+=1。就这个模式来说，非常简单。

今天我没能实现这一目标。我当前的代码如下:

• 创建时

   deals_usage= { }
  

我已经成功地为其实现了一个 jsonb 列。

• 当用户加载 deal number2 View (作为示例)时，它会更改当前用户的 deal_usage 值

  deal_usage= { { clicks_performed_by_user = 0, purchases_performed_by_user= 0} }
  

然后我管理每次点击和购买以增加其值(value)，这样如果用户点击任何交易，我就会得到

    deal_usage= { { clicks_performed_by_user = 1, purchases_performed_by_user= 0} }

但如您所见，我不知道点击是在哪个交易上执行的。我不知道如何在事件记录中定义并在点击和购买发生时保存在数据库中，当涉及到按交易执行此操作时。

我认为挑战之一涉及创建一种动态商店访问器，因为交易的数量和 ID 各不相同，每个用户将参与不同的交易，等等......

这是我当前的代码

例如，点击(也可以购买)的工作方式如下所示，使用ajax(没有表单)

the_page.html

<!-- Click on one of the tracked areas for deals -->
<div id="deal-zone">  
        <span>
          <!-- caution: link below is not looking for click_inside_deal.html.erb, it's looking for click_inside_deal.js.erb -->
          <%= link_to image_tag("image.png"), click_inside_deal_path, remote: true %>
        </span>

  <% end %>
</div>

然后进入路由寻找click_inside_deal_path

路线.rb

match '/deals/:id',
    to:   'deals#click_inside_deal',
    via:  'get',
    as:   :click_inside_deal # path for rake route pathes

然后该路由指向 Deals Controller “click_inside_deal”:

Deals_controller.rb

class DealsController < ApplicationController

def show_deal_page   
    @deal = Deal.friendly.find params[:id]
    #pass rails variables to js views with gon

    respond_to do |format|
      format.html # showcase.html.erb
      format.json { render json: @deal }
    end      

  end 

def click_inside_deal
    @deal = Deal.friendly.find params[:id]
    current_user.increment_per_deal_clicks_performed_by_user

    respond_to do |format|
        format.js 
    end    
  end    
end
purchase click_inside_deal
    @deal = Deal.friendly.find params[:id]
    current_user.increment_per_deal_purchases_performed_by_user

    respond_to do |format|
        format.js { render :template => "deals/show_purchase_modal.js.erb" }
    end    
  end    
end

如您所见，没有表单，但我纯粹通过 ajax 增加点击次数并购买，并使用增量_per_deal_clicks_performed_by_user 方法

models/user.rb

class User < ActiveRecord::Base
  rolify

  # postgresql JSON attributes accessors  
  store_accessor :deals_usage,
                  # how to put here that the 2 following accessors are for EACH deal the user participate in ?
                  :clicks_performed_by_user,
                  :purchases_performed_by_user

 def increment_per_deal_clicks_performed_by_user
      self.update_attribute(:clicks_performed_by_user, self.clicks_performed_by_user += 1) 
    end

 def increment_per_deal_purchases_performed_by_user
      self.update_attribute(:purchases_performed_by_user, self.purchases_performed_by_user += 1) 
    end

def set_default_clicks_performed_by_user
      self.clicks_performed_by_user         ||= 0
    end 

def set_default_purchases_performed_by_user
      self.purchases_performed_by_user      ||= 0
    end 

单击时，会出现模态视图

click_inside_deal.js.erb (使用 hubspot 模态警报: http://github.hubspot.com/messenger/ )

var msg;
msg = Messenger().post({

if xxx 
    message:  '<%= j render partial: "deals/failure" %>',
else
    message:  '<%= j render partial: "deals/description_of_deal" %>',
});

注意:我想保留此 jsonb 列，而不是在交易和点击或购买之间使用 has_many/has_many 关系

Answer 1

我将为您提供一个利用 jsonb 和默认更新操作的答案，这样您就不必为此行为创建特定操作。我将在下面粘贴的代码解决了您的问题，但可以进一步改进(例如通过使用 Ajax)。希望我能帮忙;)

数据库

假设表“交易”至少包含以下字段:

id | Deals_usage *其中 Deals_usage 是 jsonb 列
-------------------------------------------------- ----------------------------------
1* | {“clicks_performed_by_user”:0，“purchases_performed_by_user”:0}
2* | {“clicks_performed_by_user”:0，“purchases_performed_by_user”:0}
3 * | {“clicks_performed_by_user”:0，“purchases_performed_by_user”:0}
4* | {“clicks_performed_by_user”:0，“purchases_performed_by_user”:0}

*交易数量(您可以自定义此字段以使用其他字段)

迁移 (create_deals.rb)

class CreateDeals < ActiveRecord::Migration
  def change
    create_table :deals do |t|

      ## Properties
      t.jsonb :deals_usage, null: false, default: '{"clicks_performed_by_user": 0, "purchases_performed_by_user": 0}'

      ## Timestamps
      t.timestamps null: false
    end

    ## Indexes
    add_index :deals, :deals_usage, using: :gin
  end
end

模型 (Deal.rb)

class Deal < ActiveRecord::Base
 after_initialize :add_field_accessors

  def add_store_accessor field_name
    singleton_class.class_eval {store_accessor :deals_usage, field_name}
  end

  def add_field_accessors
    num_fields = deals_usage.try(:keys).try(:count) || 0
    deals_usage.keys.each {|field_name| add_store_accessor field_name} if num_fields > 0
  end
end

查看(deals/edit.html.erb 或其他)

<%= form_for @deal do |f| %>
  <%= f.hidden_field :clicks_performed_by_user, :value => @deal.clicks_performed_by_user.to_i + 1 %>
  <%= f.submit "Click" %>
<% end %>

# I've separated the forms in order to become easier to understand, value is      
# passed trough an hidden field and we just let update do the rest.

# Of course you can still use your methods just point out :url to your actions
# and there set attribute with Object.update_attribute(:field, "value")

<%= form_for @deal do |f| %>
  <%= f.hidden_field :purchases_performed_by_user, :value => @deal.purchases_performed_by_user.to_i + 1 %>
  <%= f.submit "Purchase" %>
<% end %>

查看(不带 form_for)

<!-- Click on one of the tracked areas for deals -->
<div id="deal-zone">  
  <span>
    <!-- leverage the update action with a link_to helper -->
    <%= link_to( "Click", deal_path(@deal, :deal => { :clicks_performed_by_user => @deal.clicks_performed_by_user.to_i + 1}), :method => :put) %>
  </span>
</div>

查看(使用 Ajax)

<!-- Click on one of the tracked areas for deals -->
<div id="deal-zone">  
  <span>
    <!-- leverage the update action with a link_to helper -->
    <%= link_to( "Click", deal_path(@deal, :deal => { :clicks_performed_by_user => @deal.clicks_performed_by_user.to_i + 1}), :remote => true, :method => :put) %>
  </span>
</div>

Controller (期望 Ajax 请求)

  # PATCH/PUT /deals/1
  # PATCH/PUT /deals/1.json
  def update
    respond_to do |format|
      if @deal.update(deal_params)
        format.html { redirect_to @deal, notice: 'Deal was successfully updated.' }
        format.json { render :show, status: :ok, location: @deal }
        format.js   { render nothing: true } # Change to what you want
      else
        format.html { render :edit }
        format.json { render json: @deal.errors, status: :unprocessable_entity }
      end
    end
  end

如果您需要任何进一步的解释，请随时与我联系。

祝你好运，编码愉快!