CSS类选择器不能用于form.collection_select Rails 5

Question

我正在尝试将一些样式应用于Rails 5中的form.collection_select助手类。但遗憾的是它没有得到应用。

你能告诉我我做错了什么吗？

1)

<%= form.collection_select(:manager_id, User.all, :id, :full_name, :include_blank => "Select None", :class => "input-with-icon") %>

2)

<%= form.collection_select(:manager_id, User.all, :id, :full_name, :include_blank => "Select None", {:class => "input-with-icon" }) %>

退货：

<select name="user[manager_id]" id="user_manager_id">
<option value="">Select None</option>
<option value="15601867">xxxxxxxxxxxxxxxxxx</option>

Answer 1

collection_select就是这样构建的（source）：

collection_select（object，method，collection，value_method，text_method，options = {}，html_options = {}）

因此，您需要为选项选项传递哈希值，并为html选项传递其他哈希值：

<%= form.collection_select(:manager_id, User.all, :id, :full_name, { include_blank: "Select None" }, { class: "input-with-icon" }) %>