空白 select 标签形式

Question

我正在尝试通过 select 用户列表之一（用户 has_many 列表和一个列表属于一个用户）。 这是我的控制器代码（假设我已经定义了@user）：

@options_for_select = []
@user.lists.each do |list|
    @options_for_select.push([list.title, list.id])
end

然后，在我看来，我有这个：

<%= select_tag(:option, @options_for_select, selected: :option, class: "form-control" ) %>

但这会呈现一个没有 select 选项的空白 select 标签。

事情是，当我做 puts "options for select are " + @options_for_select.inspect 时，我得到这个：

options for select are [["List 1", 1], ["List 2", 2], ["List 3", 3]

为什么它不起作用？

Answer 1

我所要做的就是在我的代码中包含 options_for_select(@options_for_select)。而不是

<%= select_tag(:option, @options_for_select, selected: :option, class: "form-control" ) %>

我做到了

<%= select_tag(:option, options_for_select(@options_for_select), selected: :option, class: "form-control" ) %>

哎呀

Answer 2

您可以传递一个 :include_blank => false 选项：

= f.input :option, :as => :select,  :collection => options_for_select(@options_for_select), :include_blank => false