ruby-on-rails - Rails - f.select 和奇怪的语法错误

Question

我使用以下f.select查询：

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

这行给我一个语法错误......为什么？所有的大括号都应该闭合...

Answer 1

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

应该

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

您在自己的哈希中有 disabled 选项

Answer 2

根据api，方法定义为

f.select(method, choices, options = {}, html_options = {})

where:disabled是一个选项，:class将是一个 html_option，所以调用应该写成

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

不过，最后一组括号不是必需的。