空白的选择标签形式

Question

我试图通过选择用户列表中的一个（用户has_many列表和列表属于用户）来向select标签添加可选选项。 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" ) %>

但是这会呈现一个没有选择选项的空白选择标记。

问题是，当我puts "options for select are " + @options_for_select.inspect时，我得到了这个：

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

那为什么它不起作用？

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" ) %>

我做了

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

哎。

Answer 2

您可以传递:include_blank => false选项：

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