show.html.eex

<h1>Cart</h1>
<%= if Enum.empty?(@cart.line_items) do %>
  <p>Your cart is empty</p>
<% else %>
  <%= form_for @cart_changeset, "/cart", fn f -> %>
    <table class="table">
      <thead>
        <tr>
          <th>Product name</th>
          <th>Pack size</th>
          <th>Quantity</th>
          <th>Unit price</th>
          <th>Subtotal</th>
          <td>Remove?</td>
        </tr>
      </thead>
      <tbody>
      <%= inputs_for f, :line_items, fn lf -> %> 
        <tr>
          <td><%= lf.data.product_name %></td>
          <td><%= lf.data.pack_size %></td>
          <td>
            <%= hidden_input lf, :product_id %>
            <%= number_input lf, :quantity %>
            <%= error_tag lf, :quantity %>
          </td>
          <td>₹ <%= lf.data.unit_price %></td>
          <td>₹ <%= lf.data.total %></td>
          <td><%= checkbox lf, :delete %></td>
        </tr>
      <% end %>
      <tr>
        <td colspan=4>Total</td>
        <td>₹ <%= @cart.total %></td>
        <td></td>
      </tr>
      </tbody>
    </table>
    <div class="form-group">
      <%= submit "Update Cart", class: "btn btn-primary" %>
    </div>
  <% end %>
<% end %>