我正在艰难地将 ryanb 令人敬畏的 nested_form gem 集成到我的 rails 3.1.3 应用程序中。恐怕我的 Javascript 技能太有限，无法知道是我的代码（可能）还是需要更改的 gem。也许这里有人可以提供帮助。
设置：我有一个“：households”类：accepts_nested_attributes_for“：成员（人）”。我正在运行开发服务器。我将 nested_form.js 移动到 /app/assets/javascripts 目录。我几乎可以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
我在视图中只看到家庭原生字段（预期），并且“link_to_remove”和“link_to_add”链接呈现/删除部分成员字段（预期）。但是，如果我这样做：
@household = Household.new
@household.members.build
我在视图中看到家庭本地字段（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）。那时我不能添加另一个 :members 部分，也不能删除已经显示的 :members 部分。
我难住了。以下是看起来相关的精简源文件。我正在从 git 存储库（最后捆绑 2012.04.18）中获取 nested_form 插件...
/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, { :class => 'span2', :placeholder => '[middle]'} )
= f.text_field( :name_family, { :class => 'span2', :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] + '\\])\\[.+?\\]', 'g'),
'$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, assoc, 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);
});