ruby-on-rails - Rails - 在选择中禁用选项（基于条件）

Question

我有选择：

= f.select(:category_id, @categories, :html_options => {:class => 'select_box'}, {:disabled => true if category.id == 18})

上面这段代码显然会返回错误，但是如何根据 by 禁用选项id？

Answer 1

尚未对此进行测试，但在您的控制器中您不能这样做

@checkvar = @category.id == 18 ? true : false

然后在视图中

f.select(:category_id, @categories, :html_options => {:class => 'select_box'}, {:disabled => @checkvar})

或者在模型中写一个函数来测试

def disable_select 
    if self.id == 18
        true
    else 
       false
    end
end

然后在视图中

f.select(:category_id, @categories, :html_options => {:class => 'select_box'}, {:disabled => @category.disable_select})

Answer 2

<%= f.select :status, STATUSES.map{|s| [s.titleize, s]}, { disabled: DISABLED_STATUSES.map{|s| [s.titleize, s]} %>

Answer 3

最近遇到了这个问题并使用了以下解决方案：

#view
= f.select(:category_id, @filtered_categories, :html_options => {:class => 'select_box'}

#controller
@filtered_categories = Category.all.select do |category|
  [logic here]
end

Answer 4

对于select_tag，我们可以这样做：

<%= select_tag "sample", options_for_select(
    [['A', 'a'], ['B', 'b'], ['C', 'c']]),
    {class: 'form-control', disabled: data.present? == false ? true : false}
%>