app/views/admin/valuators/_user_row.html.erb
<tr>
<td><%= link_to user.name, user_path(user) %></td>
<td><%= user.email %></td>
<td></td>
<td></td>
<td></td>
<td>
<%= form_for Valuator.new(user: user), url: admin_valuators_path do |f| %>
<%= f.hidden_field :user_id %>
<%= f.submit t("admin.valuators.valuator.add"),
class: "button success expanded" %>
<% end %>
</td>
</tr>