Render partial from another model

I have a rails application that models a house. There is a house model that has many parameters and it `has_many rooms`. A room has a `house_id` and a name. I've also used http://github.com/ryanb/complex-form-examples to allow many lights and `small_appliances` to be added to room. complex-form-example uses RJS and partials to accomplish this. There is a controller called calculator that is what users will use to access the application. When the submit button on calculator is pressed, it redirects to an `add_rooms` page (located in `app/views/calculator/add_rooms.html.erb`) page where the user can `add rooms` to the house. The add_rooms page uses a partial from `app/views/rooms/_room_form.html.erb`. I haven't been able to get this to display, as rails is always looking for things in the app/views/calculator folder. How can I get this to display? Note also that I need to save the house's id when saving the room. Here is all of the relevant code (I hope): Update If I comment out the two `add_child_link`. The page renders. However, when I click submit I get a new error message: ``` 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' ``` If I remove the small_application part, the same thing happens for light. I think it has something to do with `accepts_nested_attributes_for` in the room model. I've added the code below. I've also added the house.rb code too. 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 ``` Thanks, Ryan