2

有趣的代码段,我无法开始工作。我有以下模型/关系(排除不必要的代码)

class Service < ActiveRecord::Base
  belongs_to :service_category, :foreign_key => "cats_uid_fk"
  belongs_to :service_type, :foreign_key => "types_uid_fk"
  has_and_belongs_to_many :service_subtypes, :join_table => "services_to_service_subs"
  belongs_to :service_request, :foreign_key => "audits_uid_fk"

  accepts_nested_attributes_for :service_subtypes
end

class ServiceSubtype < ActiveRecord::Base
  belongs_to :service_types, :foreign_key => "types_uid_fk"
  has_and_belongs_to_many :services, :join_table => "services_to_service_subs"
end

显示所有这些信息的表单:

<% form_for(@request, :url => { :action => :create }) do |form| %>
 <table>   

...other data...

 <% form.fields_for :services do |fields| %>
  <%= fields.hidden_field :cats_uid_fk %>
  <%= fields.hidden_field :types_uid_fk %>
  <% fields.fields_for :service_subtypes do |subtype| %>
   <%= subtype.hidden_field :id %>
  <% end %> 
 <% end %>   

 <p>
   <%= form.submit "Create", :class=>"hargray" %>
 </p>         
<% end %> 

以及处理提交的控制器:

def create
 logger.debug params[:service_request].inspect

 @request = ServiceRequest.new(params[:service_request])
 if session[:cus_id]
  @request.customer = Customer.find session[:cus_id]
 end

 begin      
  @request.save!
  flash[:notice] = "Information submitted successfully. You will be contacted by a customer service representative regarding the services you selected."
  redirect_to :controller => "customer", :action => "index"
 rescue Exception => exc
  flash[:notice] = "#{ format_validations(@request) } - #{exc.message}"
  render :action => "new"
 end

end

html看起来很干净:

<input id="service_request_services_attributes_0_cats_uid_fk" name="service_request[services_attributes][0][cats_uid_fk]" type="hidden" value="1" />
  <input id="service_request_services_attributes_0_types_uid_fk" name="service_request[services_attributes][0][types_uid_fk]" type="hidden" value="1" />
  <input id="service_request_services_attributes_0_service_subtypes_attributes_0_id" name="service_request[services_attributes][0][service_subtypes_attributes][0][id]" type="hidden" value="2" />
   <input id="service_request_services_attributes_0_service_subtypes_attributes_0_id" name="service_request[services_attributes][0][service_subtypes_attributes][0][id]" type="hidden" value="2" />
  <input id="service_request_services_attributes_0_service_subtypes_attributes_1_id" name="service_request[services_attributes][0][service_subtypes_attributes][1][id]" type="hidden" value="4" />
   <input id="service_request_services_attributes_0_service_subtypes_attributes_1_id" name="service_request[services_attributes][0][service_subtypes_attributes][1][id]" type="hidden" value="4" />

提交的参数如下所示:

{
...other data...
 "services_attributes"=> {
  "0"=> {
   "types_uid_fk"=>"1", 
   "service_subtypes_attributes"=> {
    "0"=>{"id"=>"1"}, 
    "1"=>{"id"=>"2"}, 
    "2"=>{"id"=>"3"}
   }, 
   "cats_uid_fk"=>"1"
  }
 }
}

我返回“# 的未定义方法'service_subtype'”错误,唯一未更新的表是 HABTM 模型之间的连接表。知道如何解决这个问题或幕后发生了什么吗?我不确定我是否理解此过程背后发生的“魔力”以使其正常工作。似乎大多数人都说 HABTM 不适用于嵌套属性。似乎是这样。变通?

4

2 回答 2

1

假设这不是服务模型中的复制粘贴错误,它可能是您的问题的根源。

 accepts_nested_attributes_for :services_subtypes

应该

 accepts_nested_attributes_for :service_subtypes

Accepts_nested_attributes_for 的第一个参数应该是由 has_many、has_and_belongs_to_many 或 belongs_to 语句定义的关联。

关于隐藏字段的双重生成的第二个小问题来自您将其插入 fields_for 部分。fields_for 自动包含 id 的隐藏字段。从以下块中删除隐藏的场线是安全的。

<% fields.fields_for :service_subtypes do |subtype| %>
  <%= subtype.hidden_field :id %>
<% end %> 
于 2009-12-08T23:52:42.623 回答
0

发现那个错误,在我的邮件中。在任何情况下,fields_for :subtypes 仍然没有为嵌套属性的魔力生成正确的参数来了解我正在尝试做的事情。

我最终得到的是:

新的.erb

<% form.fields_for :services do |fields| %>
    <%= fields.hidden_field :wsi_web_serv_cats_uid_fk %>
    <%= fields.hidden_field :wsi_web_serv_types_uid_fk %>
    <%= fields.hidden_field :service_subs_hash %>
<% end %>

服务.rb

def service_subs_hash
    self.service_subtype_ids.join(", ")
end

def service_subs_hash=(ids)
    self.service_subtype_ids = ids.split(",")
end

我觉得这有点骇人听闻,我不确定我是否完全满意它作为答案,但它在我的隐藏字段中放置了一个逗号分隔的列表,我可以在提交时再次解析到 service_subtype_ids。

如果有人知道如何在没有这个额外的虚拟参数的情况下做到这一点,我很想知道。

谢谢您的帮助。

于 2009-12-09T21:49:49.540 回答