How to add please select in select_tag rails 4

Question

my select options from the controller brings as an option could add "please select" Disabled and selected. Thankyou

      <div class="form-group">
      <%= f.label :trade_id, 'Empresa', :class => 'col-lg-2 control-label' %>
      <div class="col-lg-10">
      <%= select_tag "trade_id", options_from_collection_for_select(@trade, "id", "name"),:class => 'form-control' %>
      </div>
    </div>

Answer 1

我认为您的问题可以通过在select_tag中添加“ prompt：”参数来解决，如下所示：

<%= select_tag "trade_id", options_from_collection_for_select(@trade, "id", "name"),:class => 'form-control', prompt: 'please select' %>