我无法工作的有趣代码片段。我有以下型号/关系(不必要的代码除外)HABTM双嵌套fields_for
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形式:
<% 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 %>
而且控制器来处理提交:
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
的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" />
个提交的参数是这样的:
{
...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"
}
}
}
我回来“未定义的方法‘service_subtype’为#”的错误,而不是更新的唯一表是HABTM模型之间的连接表。任何想法如何解决这个问题或幕后发生的事情?我不确定我是否理解这个过程背后发生的“魔术”,以确保它能够正常工作。似乎大多数人认为HABTM不适用于嵌套属性。似乎是这样。解决问题?
刚刚实现了它的双重生成隐藏字段的子类型。任何想法为什么上面的代码会这样做? – Lukas 2009-12-08 21:24:15