ruby-on-rails - rails 4 : Save Checkbox Results to Serialized Array

Question

我有一个带有 channel 列的 Campaign 模型。此 channel 将存储通过复选框选择的结果的序列化 数组。

这是模型..

app/models/campaign.rb

class Campaign < ActiveRecord::Base
    serialize :channels, Array
end

app/controllers/compaigns_controller.rb

class CampaignsController < ApplicationController
      def index
        @campaigns = Campaign.all.order("created_at DESC")
      end

      def new
        @campaign = Campaign.new
      end

      def create
        @campaign = Campaign.new(campaign_params)


        if @campaign.save

            zip = Uploadzip.find(params[:uploadzip_id])
            zip.campaign = @campaign
            zip.save

            flash[:success] = "Campaign Successfully Launched!"
            redirect_to @campaign
        else
            flash[:error] = "There was a problem launching your Campaign."
            redirect_to new_campaign_path
        end
      end

      def show
        @campaign = Campaign.includes(:program, :uploadzip, :channel, :plan, :uploadpdfs).find(params[:id])
      end

  private

      def campaign_params
        params.require(:campaign).permit(:name, :comment, :channel, :plan_id, :program_id, :campaign_id, uploadpdf_ids: [])
      end
end

带有复选框的表单部分..

views/campaigns/_target.rb

<%= form_for @campaign, url: {action: "create"} do |f| %>

   ...

<label class="right-inline">
   <%= f.label :channel, "Distribution Channel", class: "right-label" %>
</label>

<ul class="channel-list">
    <% ["Folder", "Fax", "Email"].each do |channel| %>

    <li><%= check_box_tag :channel, channel %> <%= channel %>
        <% end %></li>
</ul>

...

<% end %>

我在将这些结果保存在 Campaign 对象中时遇到问题。

非常感谢任何帮助。

Answer 1

首先，您提到列名称是channel，但是您在Campaign 模型中使用了它的复数形式。由于您计划在此列中保存 channel 数组，因此我建议您将数据库中的列名称更改为 channels。以下所有代码均假设您将数据库列更改为 channels。

由于您正在将 channels 属性序列化为 Array，并且您的表单会将此参数作为数组发送到 Controller ，因此您需要更新您的 campaign_params 相应的方法。

def campaign_params
  params.require(:campaign).permit(:name, :comment, :plan_id, :program_id, :campaign_id, uploadpdf_ids: [], channels: [])
end

现在，@campaign 表单的相关部分应如下所示:

<ul class="channels-list">
  <% ["Folder", "Fax", "Email"].each do |channel| %>
    <li><%= check_box_tag "campaign[channels][]", channel, @campaign.channels.include?(channel), id: "campaign_channels_#{channel}" %> <%= channel %></li>
  <% end %>
</ul>

解释

check_box_tag 中的第一个参数是标签的 name 属性。其次是 value 属性。第三个是 bool 值，用于指示复选框在最初呈现时是否会被选中。这将有助于在 edit 表单中显示当前选择。

请注意，我明确提供了 id 属性。如果我们不这样做，所有三个复选框将具有相同的 id(从它们的名称派生)，这将不是有效的 HTML，因为 id 不应该重复。

生成的 HTML 应该是这样的:

<li><input type="checkbox" name="campaign[channels][]" id="campaign_channels_Folder" value="Folder" /> Folder</li>
<li><input type="checkbox" name="campaign[channels][]" id="campaign_channels_Fax" value="Fax" /> Fax</li>
<li><input type="checkbox" name="campaign[channels][]" id="campaign_channels_Email" value="Email" /> Email</li>

controller 会将 channels 参数视为所选值的数组。

这应该适用于新建表单和编辑表单。