设置：我有一个“：household”类：accepts_nested_attributes_for“：members(people)”.我正在运行开发服务器.我将nested_form.js移动到/ app / assets / javascripts目录.我几乎肯定它只被采购一次.

问题：如果在家庭控制器“新”方法中,我这样做：

@household = Household.new

我只看到视图中的家庭原生字段(预期),并且“link_to_remove”和“link_to_add”链接呈现/删除成员字段部分(预期).但是,如果我这样做：

@household = Household.new
@household.members.build

我在视图中看到了家庭原生字段(预期),成员本地字段的一个呈现部分(预期),但“link_to_remove”和“link_to_add”什么都不做(意外).我不能添加另一个：成员部分在那一点,也不删除已经显示的：成员部分.

我很难过.以下是看似相关的精简源文件.我从git存储库获取了nested_form插件(最后捆绑了2012.04.18)…

/app/models/household.rb

class Household < ActiveRecord::Base
  has_many :members,:class_name => "Person"
  accepts_nested_attributes_for :members
  attr_accessible :id,:name,:member_ids
  attr_accessible :members_attributes
end #class

/app/models/person.rb

class Person < ActiveRecord::Base
  belongs_to :household  
  attr_accessible :id,:name_given,:name_middle,:name_family,:household_id 
end #class

/app/controllers/households_controller.rb

<snip>
  # GET /households/new
  # GET /households/new.json
  def new
    @household = Household.new
    @household.members.build     # <---- Removing this changes the behavior

    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @household }
    end
  end

/app/views/households/new.html.haml

.headbg
  .pad
    %h2 Enter a New Household
= render 'form'

/app/views/households/_form.html.haml

= nested_form_for @household,:html => { :class => "form-horizontal"} do |f|

  %fieldset 
    %legend Household

    .control-group
      = f.label( :name,{ :class => 'control-label'} )
      .controls
        = f.text_field( :name,{ :class => 'span5',:placeholder => '[household name]'} )

  %fieldset 
    %legend Household Members
    = f.fields_for :members,:html => { :class => "form-inline"} do |nested_f|
      = render :partial => 'people/nested_person_form',:locals => { :f => nested_f }
      = yield :nested_person_form
    %p
      = f.link_to_add "New Household Member",:members 

  .form-actions
    = button_tag( :class => "btn btn-primary",:disable_with => "Saving..."  ) do
      %i.icon-ok.icon-white
      Save
    = link_to households_path do
      .btn.btn-info
        %i.icon-arrow-left.icon-white
        Back to Households

/app/views/people/_nested_person_form.html.haml

- content_for :nested_person_form do

  .nested-fields
    .row
      .span8 
        .control-group
          = f.label( "Name",{ :class => 'control-label'} )
          .controls
            = f.text_field( :name_given,{ :class => 'span2',:placeholder => '[first]'} )
            = f.text_field( :name_middle,:placeholder => '[middle]'} )
            = f.text_field( :name_family,:placeholder => '[last]'} ) 
      .span1
        = f.link_to_remove "Remove"

/app/assets/javascripts/nested_form/nested_form.js

jQuery(function($) {
  window.NestedFormEvents = function() {
    this.addFields = $.proxy(this.addFields,this);
    this.removeFields = $.proxy(this.removeFields,this);
  };

  NestedFormEvents.prototype = {
    addFields: function(e) {
      // Setup
      var link    = e.currentTarget;
      var assoc   = $(link).attr('data-association');            // Name of child
      var content = $('#' + assoc + '_fields_blueprint').html(); // Fields template

      // Make the context correct by replacing new_<parents> with the generated ID
      // of each of the parent objects
      var context = ($(link).closest('.fields').find('input:first').attr('name') || '').replace(new RegExp('\[[a-z]+\]$'),'');

      // context will be something like this for a brand new form:
      // project[tasks_attributes][new_1255929127459][assignments_attributes][new_1255929128105]
      // or for an edit form:
      // project[tasks_attributes][0][assignments_attributes][1]
      if (context) {
        var parentNames = context.match(/[a-z_]+_attributes/g) || [];
        var parentIds   = context.match(/(new_)?[0-9]+/g) || [];

        for(var i = 0; i < parentNames.length; i++) {
          if(parentIds[i]) {
            content = content.replace(
              new RegExp('(_' + parentNames[i] + ')_.+?_','g'),'$1_' + parentIds[i] + '_');

            content = content.replace(
              new RegExp('(\\[' + parentNames[i] + '\\])\\[.+?\\]','$1[' + parentIds[i] + ']');
          }
        }
      }

      // Make a unique ID for the new child
      var regexp  = new RegExp('new_' + assoc,'g');
      var new_id  = new Date().getTime();
      content     = content.replace(regexp,"new_" + new_id);

      var field = this.insertFields(content,assoc,link);
      $(link).closest("form")
        .trigger({ type: 'nested:fieldAdded',field: field })
        .trigger({ type: 'nested:fieldAdded:' + assoc,field: field });
      return false;
    },insertFields: function(content,link) {
      return $(content).insertBefore(link);
    },removeFields: function(e) {
      var link = e.currentTarget;
      var hiddenField = $(link).prev('input[type=hidden]');
      hiddenField.val('1');
      // if (hiddenField) {
      //   $(link).v
      //   hiddenField.value = '1';
      // }
      var field = $(link).closest('.fields');
      field.hide();
      $(link).closest("form").trigger({ type: 'nested:fieldRemoved',field: field });
      return false;
    }
  };

  window.nestedFormEvents = new NestedFormEvents();
  $('form a.add_nested_fields').live('click',nestedFormEvents.addFields);
  $('form a.remove_nested_fields').live('click',nestedFormEvents.removeFields);
});