spree-contrib/spree_related_products

<table class="table sortable" data-hook="products_table" data-sortable-link="<%= update_positions_admin_product_relations_url(@product) %>">
   <colgroup>
    <col style="width: 5%" />
    <col style="width: 35%" />
    <col style="width: 30%" />
    <col style="width: 25%" />
    <col style="width: 5%" />
  </colgroup>
  <thead>
    <tr data-hook="products_header">
      <th></th>
      <th><%= Spree.t(:name) %></th>
      <th><%= Spree.t(:type) %></th>
      <th><%= Spree.t(:discount_amount) %></th>
      <th class="actions"></th>
    </tr>
  </thead>
  <tbody>
    <% product.relations.each do |relation| %>
      <tr id="<%= spree_dom_id relation %>" data-hook="products_row">
        <td class="handle move-handle">
          <% if Spree.version.to_d >= 4.2 && defined?(svg_icon) %>
            <%= svg_icon name: "sort.svg", width: '18', height: '18' %>
          <% else %>
            <span class="icon icon-move handle"></span>
          <% end %>
        </td>
        <% if defined? Spree::Frontend %>
          <td><%= link_to relation.related_to.name, relation.related_to %></td>
        <% else %>
          <td><%= link_to relation.related_to.name, admin_product_path(relation.related_to) %></td>
        <% end %>
        <td><%= relation.relation_type.name %></td>
        <td>
          <%= form_for relation, url: admin_product_relation_path(relation.relatable, relation) do |f| %>
            <div class="input-group justify-content-center">
              <%= f.text_field :discount_amount, class: 'form-control text-center my-1 w-50' %>
              <span class="input-group-btn">
                <%= f.button Spree.t(:update), type: 'submit', class: 'btn btn-primary m-1' %>
              </span>
            </div>
          <% end %>
        </td>
        <td class="actions">
          <%= link_to_delete relation, url: admin_product_relation_url(relation.relatable, relation), no_text: true %>
        </td>
      </tr>
    <% end %>
  </tbody>
</table>