Javascript 以嵌套形式更新

Im使用Rails 3.0.3
我有一个示范法案：

class Bill < ActiveRecord::Base
   has_many :entries    
   accepts_nested_attributes_for :entries

end

所以问题是，rails在我提交时正在寻找账单中的条目

---

知道如何解决这个问题吗？

我不知道嵌套表单如何解决这个问题，所以我将allready手动存在的条目设置为账单：

nested_entries = {}      
params[:bill][:entries_attributes] = {}  


params[:entries].each_pair do |key, value|    
   if value[:id].nil?
      params[:bill][:entries_attributes][key] = value 
   else 
     nested_entries[key] = value
   end                             
end           

@bill = Bill.new(params[:bill])  
@bill.save  

bill_id = @bill.id        

nested_entries.each_pair do |key, value|   
   @entry = Entry.find(value[:id])    
   value[:bill_id] = bill_id                            
   @entry.update_attributes(value) 
end 

ActiveRecord::RecordNotFound (Couldn't find Entry with ID=127 for Bill with ID=):
  app/controllers/bills_controller.rb:121:in `new'
  app/controllers/bills_controller.rb:121:in `create'

nested_entries = {}      
params[:bill][:entries_attributes] = {}  


params[:entries].each_pair do |key, value|    
   if value[:id].nil?
      params[:bill][:entries_attributes][key] = value 
   else 
     nested_entries[key] = value
   end                             
end           

@bill = Bill.new(params[:bill])  
@bill.save  

bill_id = @bill.id        

nested_entries.each_pair do |key, value|   
   @entry = Entry.find(value[:id])    
   value[:bill_id] = bill_id                            
   @entry.update_attributes(value) 
end