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我有一个嵌套属性 message.rb

  class Message < ActiveRecord::Base
    belongs_to :trip  
    attr_accessible :name, :email, :subject, :body
  end

属于trip.rb

  class Trip < ActiveRecord::Base
    has_many :messages 
    accepts_nested_attributes_for :messages, :allow_destroy => true
    attr_accessible :messages_attributes
  end

消息控制器.rb

  class MessagesController < ApplicationController   
   def create
     @trip = Trip.find(params[:trip_id])
     @message = @trip.messages.create(params[:message])
     redirect_to trip_path(@trip)
   end
  end

消息形式在 \trips\show.html.erb

  <%= form_for([@trip, @trip.messages.build]) do |f| %>
   <div class="field">
     <%= f.label :name%><br />
     <%= f.text_field :name %>
   </div>
   <div class="field">
     <%= f.label :email %><br />
     <%= f.text_field :email %>
   </div>

   <div class="field">
    <%= f.label :subject %><br />
   </div>

   <div class="field">
    <%= f.label :body %><br />
    <%= f.text_area :body %>
   </div>

   <div class="actions">
    <%= f.submit %>
    </div>
   <% end %>

它也应该出现在那里 \trips\show.html.erb

   <h2>Messages</h2>
     <% @trip.messages.each do |message| %>
   <p>
   <b>NAme:</b>
     <%= message.name %>
   </p>
    <b>Email:</b>
     <%= message.email %>
   </p>
     <b>Subject:</b>
     <%= message.subject %>
   </p>
     <b>Message:</b>
     <%= message.body %>
   </p>
   <% end %>

问题是它只是没有。

我的 Development.log。

, "id"=>"44"} [1m[35mTrip Load (0.0ms)[0m SELECT "trips".* FROM "trips" WHERE "trips"."id" = ? LIMIT 1 [["id", "44"]] [1m[36mCategory Load (0.0ms)[0m [1mSELECT "categories".* FROM "categories" INNER JOIN "categories_trips" ON "categories"."id" = " categories_trips"."category_id" WHERE "categories_trips"."trip_id" = 44[0m [1m[35mLocation Load (0.0ms)[0m SELECT "locations".* FROM "locations" WHERE> "locations"."id" = 18限制 1 [1m[36mCACHE (0.0ms)[0m [1mSELECT "trips".* FROM "trips" WHERE "trips"."id" = ? 限制 1[0m [1m[35m图像加载（1.0ms）[0m 选择“图像”。

我真的不明白为什么，我确实设置了 attr_accessible。你能帮我吗 ？谢谢你！

更新

通过rails控制台它可以工作：

irb(main):019:0> first_trip.messages.create(name: "emils2") ←[1m←[35mSQL (2.0ms)←[0m INSERT INTO "messages" ("body", "created_at", "email ", "name", "subject", "trip_id", "updated_at") 值 (?, ?, ?, ?, ?, ?, ?) [["body", nil], ["created_at", Wed, 2012 年 8 月 1 日 13:52:29 UTC +00:00], ["email", nil ], ["name", "emils2"], ["subject", nil], ["trip_id", 32], [ “updated_at”，2012 年 8 月 1 日星期三 13:52:29 UTC +00:00]]

32，created_at：“2012-08-01 13:52:29”，updated_at：“2012-08-01 13:52:29”>

我的 routes.rb 也嵌套了：

resources :trips do
 resources :messages
end
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