我可以在rails上使用option_groups_from_collection_for_select和include_blank嗎？

Question

我想用我的軌道幫手腳本如下：

select_tag(:article_id, option_groups_from_collection_for_select(@article, :categories, :name, :id, :name, :include_blank => "Select one category")) 

但在我的劇本，沒有任何反應。我如何使用option_groups_from_colletion_for_select和include_blank方法？

Answer 1

include_blank是選擇輔助選項，讓你幾乎有：

select_tag(:article_id, option_groups_from_collection_for_select(@article, :categories, :name, :id, :name), {:include_blank => "Select one category"})