<div class="select-users-to-chat">
  <%= form_tag  group_conversation_path(conversation),
                method: 'put',
                class: 'form-group' do %>
    <%= hidden_field_tag :added_by, current_user.id %>
    <%= collection_select(:user,
                          :id,
                          add_people_to_conv_list,
                          :id,
                          :name,
                          {},
                          {:class=>'form-control select-users-dropdown'}) %>
    <%= submit_tag 'Add the user', class: 'form-control select-users-button' %>
  <% end %>
</div>