Rails 5 error accepts_nested_attributes_for in polymorphic - ruby-on-rails

Question

I have an error when I try create a product: "Cannot build association 'type_data'. Are you trying to build a polymorphic one-to-one association?"
I don't know what is happend. I saw a lot examples with the same code but mine doesn't work.
Here my product.rb
class Product < ApplicationRecord
belongs_to :type_data, polymorphic: true
accepts_nested_attributes_for :type_data, allow_destroy: true
end
Here my hotel_room.rb
class HotelRoom < ApplicationRecord
has_one :product, as: :type_data, dependent: :destroy
has_many :rates
accepts_nested_attributes_for :rates, allow_destroy: true
end
My products/_form.html.erb
<%= f.fields_for :type_data do |builder| %>
<%= render "edit_hotel_account_fields", f: builder %>
<% end %>
My products/_edit_account_fields.heml.erb
<%= f.fields_for :rates do |builder| %>
<%= render 'rate_fields', f: builder %>
<% end %>
<%= link_to_add_fields "Add rate", f, :rates %>
My products/_rate_fields.html.erb
<div class="form-group">
<label><%= t('products.new.rates.double_price') %></label>
<%= f.number_field :double_price, step: 0.1, class: 'form-control' %>
</div>
<%= f.hidden_field :_destroy %>
<%= link_to "remove", '#', class: "remove_fields" %>
And this is all my products_controller.rb
class ProductsController < ApplicationController
before_action :set_product, only: [:show, :edit, :update, :destroy]
# GET /products
# GET /products.json
def index
#products = Product.all
end
# GET /products/1
# GET /products/1.json
def show
end
# GET /products/new
def new
#product = Product.new
end
# GET /products/1/edit
def edit
end
# POST /products
# POST /products.json
def create
#product = Product.new(product_params)
respond_to do |format|
if #product.save
format.html { redirect_to products_path, notice: 'Product was successfully created.' }
format.json { render :show, status: :created, location: #product }
else
format.html { render :new }
format.json { render json: #product.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /products/1
# PATCH/PUT /products/1.json
def update
respond_to do |format|
if #product.update(product_params)
format.html { redirect_to #product, notice: 'Product was successfully updated.' }
format.json { render :show, status: :ok, location: #product }
else
format.html { render :edit }
format.json { render json: #product.errors, status: :unprocessable_entity }
end
end
end
# DELETE /products/1
# DELETE /products/1.json
def destroy
#product.destroy
respond_to do |format|
format.html { redirect_to products_url, notice: 'Product was successfully destroyed.' }
format.json { head :no_content }
end
end
# AJAX cargas más fechas
def date_range
end
private
# Use callbacks to share common setup or constraints between actions.
def set_product
#product = Product.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def product_params
params.require(:product).permit(:status, :provider_id, :commission, :title, :commercial_title, :title_seo, :description, :seo_description, :slug_web, :slug_redirection, :services, :info, :province, :state, :city, :country, :cancel_conditions, :limit_children_age, :special_alert, :notes, :stock, :iva, :minimum_advance, type_data_attributes: [:room_stock, :room_service, :_destroy, rates_attributes: [:title, :start_date, :end_date, :hotel_room_id, :individual_price, :double_price, :child_bed_price, :adult_bed_price, :adult_breakfast_price, :adult_medium_price, :adult_complete_price, :child_breakfast_price, :child_medium_price, :child_complete_price, :_destroy]], dates: {}, map: {}, address_autocomplete: {})
end
end
Do anyone know what is happend?
Thanks!

Answer 1

As Hotel model has one Product via polymorphic,
class HotelRoom < ApplicationRecord
has_one :product, as: :type_data, dependent: :destroy
accepts_nested_attributes_for :product, allow_destroy: true
accepts_nested_attributes_for :rates, allow_destroy: true
....
end
In hotel_rooms controller new action
def new
#hotel_room = HotelRoom.new
#hotel_room.build_product
end
In Hotel view form
<%= form_for(#hotel_room) do |f| %>
....
<%= f.fields_for(:product) do |p| %>
....
<% end %>
<% end %>
Note:
If you have common data between HotelRoom and Product, then you need to introduce another model like TypeData and set it polymorphic.