初学者正在运行 rails 3.2.2，Ruby 1.8.7
我有 2 个模型，一个酒店（由脚手架创建）和设施（带有空控制器）。我能够设置 1 对 1 关联和 siplaying 字段，但似乎无法将其插入数据库。我越来越：
ActiveModel::MassAssignmentSecurity::Error in HotelsController#create
Can't mass-assign protected attributes: @hotel
app/controllers/hotels_controller.rb:48:in 'new'
app/controllers/hotels_controller.rb:48:in 'create'
--> 我的模型是：
class Hotel < ActiveRecord::Base
has_one :facility, :dependent => :destroy
accepts_nested_attributes_for :facility, :allow_destroy => true
attr_accessible :name, :rating, :recommended, :facility_attributes
end
class Facility < ActiveRecord::Base
belongs_to :hotel
attr_accessible :concierge, :hotel_id, :room24h
end
正如我所说，我的设施控制器是空的（它可以是，对吧？因为我与 Hotel 关联？）我的 hotel_controller 是创建脚手架后的默认值，仅添加了 1 行：
def new
@hotel = Hotel.new
@hotel.build_facility #-->I added this only, I searched and all i found was this
respond_to do |format|
format.html # new.html.erb
format.json { render :json => @hotel }
end
end
def create
@hotel = Hotel.new(params[:hotel])
respond_to do |format|
if @hotel.save
format.html { redirect_to @hotel, :notice => 'Hotel was successfully created.' }
format.json { render :json => @hotel, :status => :created, :location => @hotel }
else
format.html { render :action => "new" }
format.json { render :json => @hotel.errors, :status => :unprocessable_entity }
end
end
end
最后，我的表单 html 是：
<%= form_for(@hotel) do |f| %>
<div class="field">
<%= f.label :name %><br />
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :rating %><br />
<%= f.number_field :rating %>
</div>
<div class="field">
<%= f.label :recommended %><br />
<%= f.check_box :recommended %>
</div>
<br />
<h2>Hotel Facilities</h2>
<%= f.fields_for :@hotel do |facility_fields| %>
<div class="field">
<%= facility_fields.label :room24h, "24h Room Service:" %>
<%= facility_fields.check_box :room24h %>
</div>
<div class="field">
<%= facility_fields.label "Concierge:" %>
<%= facility_fields.check_box :concierge %>
</div>
<%end%>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
创建时遇到的错误是问题的开始。我应该为hotel_controller 添加更多代码吗？会是什么呢？另外，我还需要为编辑/更新做哪些代码？
在此先感谢，对不起，我是 RoR 的新手。