如何在 Rails 中为 collection_select 设置 HTML 选项？
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How do I set the HTML options for collection_select in Rails?
提问by tybro0103
I can't seem to find the syntax to add a class to a select tag generated by Rails collection_select. Some help?
我似乎找不到将类添加到由 Rails 生成的 select 标记的语法collection_select。一些帮助？
回答by Drew Blas
Many Rails helpers take multiple hash arguments. The first is usually the options to control the helper itself, and the second is the html_options where you specifiy custom ids, classes etc.
许多 Rails 助手接受多个散列参数。第一个通常是控制帮助程序本身的选项，第二个是 html_options，您可以在其中指定自定义 id、类等。
The method definition looks like this:
方法定义如下所示：
collection_select(object, method, collection, value_method, text_method, options = {}, html_options = {})
You'll notice the multiple '= {}' in the params list. To use this, the first set of options that you would specify must actually be enclosed in braces:
您会注意到参数列表中的多个 '= {}'。要使用它，您要指定的第一组选项实际上必须括在大括号中：
collection_select(:user, :title, UserTitle.all, :id, :name, {:prompt=>true}, {:class=>'my-custom-class'})
If you don't have any options to specify besides the html class, then just put an empty hash placeholder:
如果除了 html 类之外没有任何选项可以指定，那么只需放置一个空的哈希占位符：
collection_select(:user, :title, UserTitle.all, :id, :name, {}, {:class=>'my-custom-class'})
Additional API documentation is available at: http://apidock.com/rails/ActionView/Helpers/FormOptionsHelper/collection_select
其他 API 文档位于：http: //apidock.com/rails/ActionView/Helpers/FormOptionsHelper/collection_select
回答by drjorgepolanco
= f.collection_select :category_id, Category.order(:name), :id, :name, {}, {class: "store-select"}
