DoubleDog Many-to-Many From

index.html.erb

<h2>Create New Order</h2>

<% if @error %>
    <p>Error: <%= @error %> </p>
<% end %>

<%= form_tag orders_path, :method => :post do %>

    <!-- Our goal is to an array of item ids -->
    <select class="item-select" name="order[item_ids][]">
        <% @items.each do |item| %>
        <option value="<%= item.id %>"><%= item.name %></option>
        <% end %>
    </select>

    <br />
    <button class="add-item">Add Item</button>

    <%= submit_tag "Create Order" %>
<% end %>


<script type="text/javascript">
$('.add-item').on('click', function (e) {
    e.preventDefault();
    var $itemSelect = $('.item-select:last');
    console.log("Item select", $itemSelect);
    $itemSelect.after( $itemSelect.clone() );
});
</script>



<% @orders.each do |order| %>
<p>
  Order #<%= order.id %>
  <ul>
    <% order.items.each do |item| %>
      <li><%= item.name %></li>
    <% end %>
  </ul>
</p>
<% end %>

orders_controller.rb

class OrdersController < ApplicationController
  def index
    @orders = DoubleDog.db.all_orders
    @items = DoubleDog.db.all_items
  end

  def create
    tx_params = { session_id: $session_id }
    tx_params[:items] = order_params[:item_ids].map! do |id|
      DoubleDog.db.get_item(id.to_i)
    end

    result = DoubleDog::CreateOrder.new.run(tx_params)
    
    if result[:success?]
      redirect_to orders_path
    else
      @error = result[:error]
      render 'index'
    end
  end

  private

  def order_params
    params.require(:order).permit(item_ids: [])
  end
end