ruby-on-rails - 将类添加到 collection_select

Question

我看过How do I set the HTML options for collection_select in Rails?我确信我遗漏了一些明显的东西，但我无法让它发挥作用。

我的选择目前看起来像:

  <%= f.collection_select :broadcast_id, broadcasts, :id, :to_s,
    :include_blank => 'Broadcast on...' %>

我已经尝试包括 :class => 'prevent_collapse'，它什么都不做，以及 {:class => 'prevent_collapse'}，它给出我出错了。

如果有人能指出如何做到这一点，我将不胜感激!

Answer 1

collection_select(object, method, collection, value_method, text_method, options = {}, html_options = {})
=>
f.collection_select :broadcast_id, broadcasts, :id, :to_s,
{:include_blank => 'Broadcast on...'}, {:class => 'prevent_collapse'}

你有什么错误？

广播项目是否有 :to_s 方法？正如我所想，它将返回类名。