从另一个模型渲染部分

时间：2009-10-12 21:06:06

标签： ruby-on-rails model render partial

我有一个用于模拟房屋的rails应用程序。有一个房屋模型，有许多参数，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来允许许多灯光和small_appliances添加到房间。 complex-form-example使用RJS和partials来实现这一目标。

有一个名为calculator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add rooms到该房子。 add_rooms页面使用app/views/rooms/_room_form.html.erb的部分内容。我无法显示，因为rails总是在app / views / calculator文件夹中查找内容。

我该如何显示？另请注意，我需要在保存房间时保存房屋的ID。

以下是所有相关代码（我希望）：

更新

如果我注释掉两个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：

ActiveRecord::AssociationTypeMismatch in CalculatorController#add_room

SmallAppliance(#49096610) expected, got Array(#1560620)

RAILS_ROOT: C:/Users/ryan/Downloads/react
Application Trace | Framework Trace | Full Trace

C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/associations/association_proxy.rb:263:in `raise_on_type_mismatch'
C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/associations/association_collection.rb:320:in `replace'
C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/associations/association_collection.rb:320:in `each'
C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/associations/association_collection.rb:320:in `replace'
C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/associations.rb:1322:in `small_appliances='
C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/base.rb:2744:in `send'
C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/base.rb:2744:in `attributes='
C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/base.rb:2740:in `each'
C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/base.rb:2740:in `attributes='
C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/base.rb:2438:in `initialize'
C:/Users/ryan/Downloads/react/app/controllers/calculator_controller.rb:31:in `new'
C:/Users/ryan/Downloads/react/app/controllers/calculator_controller.rb:31:in `add_room'

如果我删除了small_application部分，那么光会发生同样的事情。我认为它与房间模型中的accepts_nested_attributes_for有关。我已添加以下代码。我也添加了house.rb代码。

应用程序/模型/ 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

应用程序/模型/ house.rb 

class House < ActiveRecord::Base
  has_many :rooms

  # validation code not included

  def add_room(room)
    rooms << room
  end

end

应用程序/控制器/ 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

应用程序/视图/计算器/ 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>

应用程序/视图/房间/ _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

3 个答案:

答案 0 :(得分：3)

非常奇怪 - 如果你写<%= render :partial => 'room_form' %>而不是rails会假设它是app/views/calculator/_room_form.html.erb，但是如果是＆lt;％= render：partial =＆gt; 'rooms / room_form'％＆gt;它会假设它是app/views/rooms/_room_form.html.erb

观察您的日志 - 您将看到哪些部分已呈现

答案 1 :(得分：1)

我知道这个问题已经过时但我遇到了同样的问题，并设法解决了这个问题。

具体而言，我也是关注ryan bates复杂形式的例子。

我的表单没有呈现相同的错误：

undefined method `reflect_on_association' for NilClass:Class

我注释掉了add_child_link帮助器和呈现的表单，但在提交后我得到了：

ChildModel expected, got Array

经过多次头疼后，我做了一个简单的修改，修复了一切：

-- form_for :project
++ form_for @project

没错，只需切换实例变量的符号就可以了。这就行了。

希望这有助于其他任何陷入困境的人

答案 2 :(得分：0)

问题是，当您尝试添加子链接时，没有定义room对象。 

render :partial => 'rooms/room_form', :object => Room.new
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