【发布时间】：2010-12-06 03:07:02
【问题描述】：
我有一个为房屋建模的 Rails 应用程序。有一个房屋模型有很多参数，它是has_many rooms。一个房间有一个house_id 和一个名字。我还使用了http://github.com/ryanb/complex-form-examples 来允许许多灯和small_appliances 被添加到房间。 complex-form-example 使用 RJS 和 partials 来实现这一点。
有一个称为计算器的控制器，用户将使用它来访问应用程序。当按下计算器上的提交按钮时，它会重定向到add_rooms 页面（位于app/views/calculator/add_rooms.html.erb）页面，用户可以在该页面add rooms 到房子。 add_rooms 页面使用来自app/views/rooms/_room_form.html.erb 的部分内容。我无法让它显示，因为 rails 总是在 app/views/calculator 文件夹中寻找东西。
我怎样才能让它显示？另请注意，我在保存房间时需要保存房屋的 id。
这是所有相关代码（我希望）：
更新
如果我注释掉这两个add_child_link。页面呈现。但是，当我单击提交时，我收到一条新的错误消息：
如果我删除 small_application 部分，同样的事情也会发生在 light 上。我认为这与房间模型中的accepts_nested_attributes_for 有关。我在下面添加了代码。我也添加了 house.rb 代码。
app/models/room.rb
class Room < ActiveRecord::Base
belongs_to :house
has_many :lights, :dependent => :destroy
has_many :small_appliances, :dependent => :destroy
validates_presence_of :name
accepts_nested_attributes_for :lights, :reject_if => lambda { |a| a.values.all?(&:blank?) }, :allow_destroy => true
accepts_nested_attributes_for :small_appliances, :reject_if => lambda { |a| a.values.all?(&:blank?) }, :allow_destroy => true
end
app/models/house.rb
class House < ActiveRecord::Base
has_many :rooms
# validation code not included
def add_room(room)
rooms << room
end
end
app/controllers/calculator_controller.rb
class CalculatorController < ApplicationController
def index
end
def save_house
@house = House.new(params[:house])
respond_to do |format|
if @house.save
format.html { render :action => 'add_rooms', :id => @house }
format.xml { render :xml => @house, :status => :created, :location => @house }
else
format.html { render :action => 'index' }
format.xml { render :xml => @house.errors, :status => :unprocessable_entity }
end
end
end
def add_rooms
@house = House.find(params[:id])
@rooms = Room.find_by_house_id(@house.id)
rescue ActiveRecord::RecordNotFound
logger.error("Attempt to access invalid house #{params[:id]}")
flash[:notice] = "You must create a house before adding rooms"
redirect_to :action => 'index'
end
def add_room
@house = House.find(params[:id])
@room = Room.new(params[:room])
respond_to do |format|
if @room.save
@house.add_room(@room)
@house.save
flash[:notice] = "Room \"#...@room.name}\" was successfully added."
format.html { render :action => 'add_rooms' }
format.xml { render :xml => @room, :status => :created, :location => @room }
else
format.html { render :action => 'add_rooms' }
format.xml { render :xml => @room.errors, :status => :unprocessable_entity }
end
end
rescue ActiveRecord::RecordNotFound
logger.error("Attempt to access invalid house #{params[:id]}")
flash[:notice] = "You must create a house before adding a room"
redirect_to :action => 'index'
end
def report
flash[:notice] = nil
@house = House.find(params[:id])
@rooms = Room.find_by_house_id(@house.id)
rescue ActiveRecord::RecordNotFound
logger.error("Attempt to access invalid house #{params[:id]}")
flash[:notice] = "You must create a house before generating a report"
redirect_to :action => 'index'
end
end
app/views/calculator/add_rooms.html.erb
<div id="addRooms">
<p>House id is <%= @house.id %></p>
<h3>Your rooms:</h3>
<% if @house.rooms %>
<ul>
<% for room in @house.rooms %>
<li>
<%= h room.name %> has <%= h room.number_of_bulbs %>
<%= h room.wattage_of_bulbs %> watt bulbs, in use for
<%= h room.usage_hours %> hours per day.
</li>
<% end %>
</ul>
<% else %>
<p>You have not added any rooms yet</p>
<% end %>
<%= render :partial => 'rooms/room_form' %>
<br />
<%= button_to "Continue to report", :action => "report", :id => @house %>
</div>
app/views/rooms/_room_form.html.erb
<% form_for :room, :url => { :action => :add_room, :id => @house } do |form| %>
<%= form.error_messages %>
<p>
<%= form.label :name %><br />
<%= form.text_field :name %>
</p>
<h3>Lights</h3>
<% form.fields_for :lights do |light_form| %>
<%= render :partial => 'rooms/light', :locals => { :form => light_form } %>
<% end %>
<p class="addLink"><%= add_child_link "[+] Add new light", form, :lights %></p>
<h3>Small Appliances</h3>
<% form.fields_for :small_appliances do |sm_appl_form| %>
<%= render :partial => 'rooms/small_appliance', :locals => { :form => sm_appl_form } %>
<% end %>
<p class="addLink"><%= add_child_link "[+] Add new small appliance", form, :small_appliances %></p>
<p><%= form.submit "Submit" %></p>
<% end %>
application_helper.rb
module ApplicationHelper
def remove_child_link(name, form)
form.hidden_field(:_delete) + link_to_function(name, "remove_fields(this)")
end
def add_child_link(name, form, method)
fields = new_child_fields(form, method)
link_to_function(name, h("insert_fields(this, \"#{method}\", \"#{escape_javascript(fields)}\")"))
end
def new_child_fields(form_builder, method, options = {})
options[:object] ||= form_builder.object.class.reflect_on_association(method).klass.new
options[:partial] ||= method.to_s.singularize
options[:form_builder_local] ||= :form
form_builder.fields_for(method, options[:object], :child_index => "new_#{method}") do |form|
render(:partial => options[:partial], :locals => { options[:form_builder_local] => form })
end
end
end
谢谢，
瑞恩
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标签： ruby-on-rails model render partial