cart.html.haml

#cart-panel.cart-panel-hidden
  #cart-title Cart
  = inline_svg "shop.svg", class: "cart-svg svg"
  #cart-info
    = label :user, :name, 'SID', class: "cart-label"
    = text_field :user, :name, class: "cart-input"
    = label :user, :comment, 'Comment', class: "cart-label"
    .comment-arrow
    = text_area :user, :comment, class: "cart-textarea", cols: "18", rows: "2"
    = label :user, :items, 'Items', class: "cart-label"
  #cart-items
    - @cart.each_with_index do |item, index|
      .cart-item 
        = text_field "item#{index}", :quantity, value: item[:quantity], class: "cart-item-quantity"
        = label "item#{index}", :name, item[:name], class: "cart-item-name"
  #checkout-footer
    =link_to "Checkout", checkout_path(hash: session[:cart]), method: :post, id: "checkout-button"

items_controller.rb

class ItemsController < ApplicationController    
  def checkout
    cart = params[:hash]
    redirect_to transactions_path(cart: cart)
  end
  
  def add_item
    @cart = session[:cart]
    @id = params[:id]
    if @cart.has_key? @id
      @cart[@id] += 1
    else
      @cart[@id] = 1
    end
    session[:cart] = @cart
    redirect_to items_path
  end
end

table.html.haml

    %table#inventory-table
      %thead
        %tr
          %th{:class => ('hilite' if @sort == 'name'), :id => 'title_header'}= link_to "Item", items_path(:sort => 'name')
          %th{:class => ('hilite' if @sort == 'quantity'), :id => 'title_header'}= link_to "Quantity", items_path(:sort => 'quantity')
          %th{:class => ('hilite' if @sort == 'price'), :id => 'title_header'}= link_to "Price", items_path(:sort => 'price')
          %th{:class => ('hilite' if @sort == 'kind'), :id => 'title_header'}= link_to "Kind", items_path(:sort => 'kind')
          %th{:class => ('hilite' if @sort == 'status'), :id => 'title_header'}= link_to "Status", items_path(:sort => 'status')
          %th.add-column Add
      %tbody
        - @items.each do |item|
          %tr
            %td= link_to item.name, item_path(item)
            %td= item.quantity
            %td= item.price 
            %td= item.kind
            %td= item.status
            %td.add-column
              =link_to add_item_path(:id => item.id), method: :post do
                = inline_svg "plus.svg", class: "add-svg"

The problem is making a transaction given a list of items. I want to figure out how to contain every object I add to the cart in an array. This would enable me to easy extract the params in the controller, without creating and keeping an array of items in my controller.

e.g.

items = [
{name: “item1”, …},
{name: “item2”, …}
]