动态添加预先填充的嵌套表单，使用cocoon和rails3-jquery-autocomplete

Question

耽误您时间，实在对不起。

我正在使用rails 3.2，我使用的是gems 表格、茧和铁路3-jquery-自动完成。

我有以下型号的机器，零件，PartUsage，MachineCosting和PartCosting

机器和零件模型具有多到多的关联。

    class Machine < ActiveRecord::Base
      attr_accessible :name

      has_many :part_usages
      has_many :parts, :through => :part_usage
    end

    class Part < ActiveRecord::Base
      attr_accessible :name
    end

    class PartUsage < ActiveRecord::Base
      attr_accessible :machine_id, 
                      :part_id
      belongs_to :part
      belongs_to :machine
    end

MachineCosting和PartCosting模型具有一对多的关联。

    class MachineCosting < ActiveRecord::Base

       attr_accessible :machine_id,
                       :total_cost,
                       :machine_name,
                       :part_costings_attributes

       attr_accessor :machine_name                

       has_many :part_costings, :dependent => :destroy

       accepts_nested_attributes_for :part_costings, :allow_destroy => true    

       def machine_name
         self.machine.try(:name)
       end

    end

    class PartCosting < ActiveRecord::Base
      attr_accessible :part_id,
                      :part_name,
                      :cost

      attr_accessor :part_name

      belongs_to :machine_costing
      belongs_to :part

      def part_name
        self.part.try(:name)
      end
    end

MachineCosting表格

视图/机器成本/_form.html.erb

   <%= simple_form_for(@machine_costing, :html => {:multipart => true}) do |f| %>

     <%= f.input :machine_id, :url => autocomplete_machine_id_machines_path, 
            :as => :autocomplete %>

        <!-- HERE, WHENEVER I SELECT A MACHINE, I WANT TO ADD NESTED-FORMS FOR 
     PARTCOSTINGS CORRESPONDING TO ALL THE PARTS OF THE MACHINE I JUST SELECTED.-->

        <%= f.simple_fields_for :part_costings do |part_costing|%>   
          <%= render 'part_costings/part_costing_fields', :f => part_costing %>
        <% end %>

   <% end %>

请建议在字段中选择PartCostings后，如何使用javascript填充和动态添加machine_id字段的固定no。

我很乐意提供更多的信息。

再次感谢！！

Answer 1

首先，总结我的方法。

• 在MachineCosting表单中，使用‘Rails3-jQuery-Automopate’gem以其名称搜索机器。
• 黑客MachineController也发送‘零件信息’与匹配机器的json形式。
• 当用户选择一台机器时，使用javascript为PartCostings添加PartCostings，并使用json表单接收的数据部分填充它们。

下面是我是如何做到的(代码部分)。

视图/机器成本/_form.html.erb

    <%= simple_form_for(@machine_costing, :html => {:multipart => true}) do |f| %>
        <%= f.error_notification %>

        <%= f.input :machine_name, :url => autocomplete_machine_name_machines_path, 
                  :as => :autocomplete, :input_html => { :id_element   =>  "#machine_costing_machine_id"} %>

        <%= f.association :machine, :as => :hidden %>

        <div id='part_costings'>
          <%= f.simple_fields_for(:part_costings) do |part_costing|%>   
            <%= render 'part_costings/part_costing_fields', :f => part_costing %>
          <% end %> 

          <div class="links hidden">
            <%= link_to_add_association 'Add part costings', f, :part_costings, 
              :partial => 'part_costings/part_costing_fields' %>
          </div>
        </div>

        <%= f.button :submit%>
    <% end %>

views/part_costings/_part_costing_fields.html.erb

    <div class= 'nested-fields'>    
            <!-- DO NOT CHANGE THE ORDER OF ATTRIBUTES ELSE machine_costing.js WILL FAIL -->
           <%= f.input :part_id, :as=> :hidden %>
           <%= f.text_field :part_name, :disabled => 'disabled' %>           
           <%= f.input :cost %>
           <%= link_to_remove_association '<i class="icon-remove"></i>'.html_safe, f ,:class =>"part_costing_remove" %>
    </div> 

控制器/机器控制器

    class MachinesController < ApplicationController

      # OVER RIDING THIS BY OWN METHOD
      # autocomplete :machine, :name, :full=> true, :extra_data => [:machine_id]

      def autocomplete_machine_name
        respond_to do |format|
          format.json {
            @machines = Machine.where("name ilike ?", "%#{params[:term]}%")

            render json: json_for_autocomplete_machines(@machines)
          }
        end
      end

      def json_for_autocomplete_machines(machines)
        machines.collect do |machine|

          parts = Hash.new
          unless machine.part_usages.empty?
            machine.part_usages.each do |part_usage|
              parts[part_usage.part.id] = part_usage.part.name
            end
          end

          hash = {"id" => machine.id.to_s, "value" => machine.name,
                            "parts" => parts} 

          hash
        end
      end 

      #
      #
      #

    end

这是javascript部分。

assest/javascripts/machine_Codingings.js

    $(function() {

      // Part Costings
      var part_id;
      var part_name;

      $('#machine_costing_machine_name').bind('railsAutocomplete.select', function(event, data){
        console.debug("Machine selected...");
        parts = data.item.parts;
        console.debug("Removing existing part_costings...");
        $('.part_costing_remove').click();
        console.debug("Adding part_costings...");
        for(var id in parts) {
         part_id = id;
         part_name = parts[id];
         $('.add_fields').click();
        }
        console.debug("Done adding all part_costings...");
      });

      $('#part_costings').bind('cocoon:after-insert', function(e, part_costing) {
        part_costing[0].getElementsByTagName('input')[0].value = part_id;
        part_costing[0].getElementsByTagName('input')[1].value = part_name;
        console.debug("Added part_costing...");
      });

    });

routes.rb

  resources :machines  do
      get :autocomplete_machine_name, :on => :collection
  end

javascript解决方案的关键点是..。

1. 方法“bind(‘栏杆自动完成. Method’，函式(事件，资料))”，从Rail3-jQuery-自动完成创业板。
2. 方法从蚕茧宝石中“结合”(‘茧:插入后’，功能(e，part_costing)“。

就这样。如果你有什么建议，请告诉我。谢谢:)