ruby-on-rails - 从另一个模型渲染部分

Question

我有一个为房子建模的 Rails 应用程序。有一个有很多参数的房子模型has_many rooms。一个房间有一个house_id和一个名字。我还使用http://github.com/ryanb/complex-form-examples来允许许多灯光并small_appliances添加到房间中。complex-form-example 使用 RJS 和 partials 来完成此任务。

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，它会重定向到一个add_rooms页面（位于中app/views/calculator/add_rooms.html.erb），用户可以add rooms在该页面中找到房子。add_rooms 页面使用部分 from app/views/rooms/_room_form.html.erb。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，我需要在保存房间时保存房子的 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：

CalculatorController#add_room 中的 ActiveRecord::AssociationTypeMismatch

SmallAppliance(#49096610) 预期，得到 Array(#1560620)

RAILS_ROOT: C:/Users/ryan/Downloads/react
应用程序跟踪 | 框架跟踪 | 全跟踪

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 small_application 部分，光也会发生同样的事情。我认为这与accepts_nested_attributes_for房间模型有关。我在下面添加了代码。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>

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，
瑞安

score 5 · Accepted Answer

很奇怪——如果你写<%= render :partial => 'room_form' %>的话，rails 会假设它是app/views/calculator/_room_form.html.erb，但是如果是 <%= render :partial => 'rooms/room_form' %> 它会假设它是app/views/rooms/_room_form.html.erb

观察你的日志——在那里你会看到渲染了哪些部分

score 1 · Accepted Answer

room问题是您在尝试添加子链接时没有定义对象。

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

score 1 · Accepted Answer

我知道这个问题很老，但我遇到了同样的问题并设法解决了它。

具体来说，我也在关注 ryan bates 复杂形式的示例。

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 助手和呈现的表单，但在提交后我得到了：

ChildModel expected, got Array

经过多次头疼后，我做了一个简单的更改，修复了所有问题：

-- form_for :project
++ form_for @project

没错，只要切换一个实例变量的符号就可以了。

希望这可以帮助其他陷入困境的人

ruby-on-rails - 从另一个模型渲染部分

更新

应用程序/模型/room.rb

应用程序/模型/house.rb

应用程序/控制器/calculator_controller.rb

应用程序/视图/计算器/add_rooms.html.erb

app/views/rooms/ _room_form.html.erb

application_helper.rb

3 回答 3

Related

Reference

app/views/rooms/ `_room_`form.html.erb