Rails ajax form for products - ruby-on-rails

Question

I've been working with app for pizzeria where customers could order pizzas through their website. I currently working with the product page where I try to submit products to shopping cart through ajax, but I'm really stuck. I haven't been able to build a shoppingcart which would accept product-id, product-size-id, extra-toppings as an array and quantity. I decided to try to go with session-store where all the order-row ids are stored and on menu page every product has a form where user could add product, size and quantity to shoppingcart but I keep getting this error in server logs:
Started POST "/order_row" for ::1 at 2015-08-03 11:18:21 +0300
Processing by OrderRowsController#create as JS
Parameters: {"utf8"=>"✓", "order_row"=>{"product"=>"1", "size"=>"0", "quantity"=>"2"}, "commit"=>"Tilaa"}
Completed 500 Internal Server Error in 2ms (ActiveRecord: 0.0ms)
ActiveRecord::AssociationTypeMismatch (Product(#70158072501800) expected, got String(#70158039566200)):
app/controllers/order_rows_controller.rb:4:in `create'
I have models Product, ProductCategory, Order, OrderRow and my session stores order-row-ids as mentioned. My menu page is actually product_categories#show -view where products belonging to that category are listed.
#order_rows_controller.rb
class OrderRowsController < ApplicationController
respond_to :html, :js
def create
#orow = OrderRow.new(order_rows_params)
if #orow.save
session[:order_row_ids] << #orow.id
flash[:notice] = "Lisättiin ostoskoriin!"
else
flash[:error] = "Tuotteen lisääminen ostoskoriin epäonnistui."
redirect :back
end
end
def update
#orow = OrderRow.find(params[:id])
if #orow.update_attributes(params[:order_row])
flash[:notice] = "Ostoskori päivitetty."
else
flash[:error] = "Ostoskorin päivitys epäonnistui."
end
end
def destroy
#orow.find(params[:id]).destroy
flash[:notice] = "Tuote poistettu onnistuneesti"
end
private
def order_rows_params
params.require(:order_row).permit(:product, :size, :quantity) #, :extras => []
end
end
ProductCategories-controller
class ProductCategoriesController < ApplicationController
before_action :set_product_category, only: [:edit, :update, :destroy]
respond_to :html, :js
def index
#product_categories = ProductCategory.all
end
def show
#product_category = ProductCategory.friendly.find(params[:id])
#product_categories = ProductCategory.all
#products = #product_category.products
#order_row = OrderRow.new(order: nil, product: nil, size: nil, extras: nil, quantity: nil)
end
And menu-page in product_categories/show.html.erb
#product_categories#show -view
<!--- category descriptions -->
<div class="container">
<% #products.each do |product| %>
<div class="col-sm-6 col-md-4">
<div class="product well">
<h3><%= product.name %></h3>
<span><%= product.description %></span>
<p class="prices">
<%= price(product.normal_price) %> | <%= price(product.plus_size_price) %> | <%= price(product.lunch_price) %>
</p>
<br>
<div id="form-<%= product.id %>">
<%= simple_form_for #order_row, :url => url_for(:controller => 'order_rows', :action => 'create'), remote: true do |f| %>
<%= f.hidden_field :product, :value => product.id %>
<h5>Koko</h5>
<div style="padding-left: 13px">
<%= f.input :size, collection: OrderRow.sizes, as: :radio_buttons, label: false, item_label_class: "radio-inline", item_wrapper_tag: false %>
</div>
<h5>Määrä</h5>
<div style="width: 8%; padding-left: 13px;">
<%= f.input :quantity, as: :string, label: false %>
</div>
<p>
<%= f.submit "Tilaa", class: "btn btn-success btn-lg" %>
</p>
<% end %>
</div>
</div>
</div>
<% end %>
</div>
Create.js.erb in order_rows#create action
#create.js.erb
$("#form-<%= params[:product] %>").load(document.URL + "#form-<%= params[:product]");
Associations:
#order_row
belongs_to :order
belongs_to :product
#product
belongs_to :product_category
has_one :campaign_producte
belongs_to :dish_type
#product_categories
has_many :products
has_many :campaign_products
has_many :product_extras
has_many :dish_types, through: :products
#product_extra
belongs_to :product_category
Link to github-repo: https://github.com/casualCodeAndDesign/ravintolamammamia
What's the reason for this server error and why it doesn't store my order_row to the database?

Answer 1

ActiveRecord::AssociationTypeMismatch (Product(#70158072501800)
expected, got String(#70158039566200))
You need to change
<%= f.hidden_field :product, :value => product.id %>
to
<%= f.hidden_field :product_id, :value => product.id %>
and product to product_id in create.js.erb and order_rows_params