css - 以 Rails 4 形式向 grouped_options_for_select 添加类

Question

我似乎无法让这个 select 上的类起作用。分组集合有效......但不是类:

 = f.select :topic_id, grouped_options_for_select([['News',  @topics.news.order(title: :asc).collect {|v| [ v.title, v.id ] }],
        ['Opinion',    @topics.opinion.order(title: :asc).collect {|v| [ v.title, v.id ] }]]), html: {include_blank:  false , id:  'page_topic', class:  'form-control'} 

Answer 1

尝试不使用 html: 键:

= f.select :topic_id, grouped_options_for_select([['News',  @topics.news.order(title: :asc).collect {|v| [ v.title, v.id ] }],
    ['Opinion', @topics.opinion.order(title: :asc).collect {|v| [ v.title, v.id ] }]]), include_blank:  false, id: 'page_topic', class:  'form-control'

附言您的代码很难阅读，请尝试将一些部分提取到变量中，如下所示:

- news_options = ['News', @topics.news.order(title: :asc).collect {|v| [ v.title, v.id ] } ]
- opinion_options = ['Opinion', @topics.opinion.order(title: :asc).collect {|v| [ v.title, v.id ] }]    
- options = grouped_options_for_select([news_options, opinion_options])
= f.select :topic_id, options, include_blank: false, id: 'page_topic', class: 'form-control'