带有simple_form的Rails：使用link_to_add添加新的表格行

Question

我在通过单击link_to_add功能链接添加新的表格行时遇到了问题。

Answer 1

因为它花了我一些搜索，并尝试&错误找到这里是我的解决方案。它的关键是使用nathanvda的cocoon gem（而不是ryanb的nested_form），它允许定义一个jquery选择器（称为data-association-insertion-node），以在哪里插入新的字段集。在我的示例中，我使用HAML和Twitter Bootstrap代码，但您可以轻松地将其替换为您自己的收藏夹。

/app/views/users/_form.html.haml：

= simple_form_for @user, :html => {:class => "form-horizontal"} do |f| 
    = render "shared/error_messages", :target => @user 
    .row-fluid 
    .span12 
     .fieldset 
     = f.input :username, :label => "Username:", :placeholder => "Username" 

     %table.table 
      %thead 
      %tr 
       %th 
       %i.icon-calendar 
       Date 
       %th 
       %i.icon-pencil 
       Description 
       %th 
       %i.icon-cog 
       Action 
      %tbody#user_events 
      = f.simple_fields_for :user_events do |event| 
       = render "user_event_fields", :f => event 

     = link_to_add_association f, :user_events, :"data-association-insertion-node" => "tbody#user_events", :"data-association-insertion-method" => "append", :partial => "user_event_fields", :class => "btn" do 
      %i.icon-plus 
      Add new event 

     %p.help-block 
      %strong Please note: 
      Events are only removed after confirming the changes with 
      %span.label 
      %i.icon-ok 
      Update settings! 

     = f.button :submit, :class => "btn" do 
      %i.icon-ok 
      Update settings! 

/app/views/users/_user_event_fields.html.haml：

%tr.nested-fields 
    %td= f.input_field :date, :as => :date_month_year, :class => "tooltip-bottom input-small", :rel => "tooltip", :title => "Date of event", :disabled => params[:action] == "show" 
    %td= f.input_field :description, :placeholder => "Description", :class => "input-large tooltip-bottom", :rel => "tooltip", :title => "Description of event<br/>Use <strong>Markdown</strong> to format your text.", :disabled => params[:action] == "show" 
    %td= f.input_field :label, :placeholder => "Label", :class => "input-medium tooltip-bottom", :rel => "tooltip", :title => "Label of event", :disabled => params[:action] == "show" 
    %td= f.input_field :label_class, :collection => [["Green", "label-success"], ["Yellow", "label-warning"], ["Red", "label-important"], ["Blue", "label-info"], ["Black", "label-inverse"]], :include_blank => "Grey", :class => "input-small tooltip-bottom", :rel => "tooltip", :title => "Label color of event", :disabled => params[:action] == "show" 
    %td 
    = link_to_remove_association f, :class => "btn" do 
     %i.icon-remove 

请注意.nested-fields类的标签是必不可少的删除链接工作。