Rails:多个下拉菜单collection_select [英] Rails: Multiple dropdown menus collection_select

问题描述

此处是Super Rails n00b:目前，我有一个包含以下代码的表单:

Super Rails n00b here: Currently I have a form with the following code:

<%= f.collection_select :account_ids, @accounts, :id, :name, include_blank: true %>

，它目前可以按我的要求运行，但是现在我希望有多个下拉菜单，以便可以选择多个帐户.我不希望多个选择位于同一下拉列表中.

and it currently works how I want it to but now I would like to have multiple drop down menus so I can select multiple accounts. I do not want the multiple select to be on the same dropdown.

如果我这样做:

<%= f.collection_select :account_ids, @accounts, :id, :name, include_blank: true %>
<%= f.collection_select :account_ids, @accounts, :id, :name, include_blank: true %>
<%= f.collection_select :account_ids, @accounts, :id, :name, include_blank: true %>

仅最后一个选择出现在参数中.我怎样才能使参数看起来像这样:

only the last selection appears in the params. How can I make it so the params would look like this:

"journal"=>{"account_ids"=>["1","2","3"]}

collection.select可以执行此操作吗?还是应该使用其他方式?任何帮助将不胜感激.谢谢！

Can collection.select do this or should I be using something different? Any help would be greatly appreciated. Thanks!

推荐答案

您需要添加一个选项:multiple :

<%= f.collection_select :account_ids, @accounts, 
                        :id, :name, { include_blank: true },
                         { multiple: true } %>

注意: :multiple -如果设置为 true 时，该选择将允许多个选择.

Note: :multiple- If set to true the selection will allow multiple choices.

我写了一个小片段来测试它.我的代码:

I wrote a little snippet to test it. My code :

<%= form_for @track, url: fetch_path do |f| %>
  <%= f.collection_select :label, @tracks, :id, :title, {include_blank: true}, {multiple: true} %>
<% end %>

这是页面:

或者，如果您确实要复制:

Or, if you really want to duplicate:

<% klass = f.object.class.model_name.param_key %>
<%= f.collection_select :account_ids, @accounts, :id, :name, { include_blank: true } , { name: "#{klass}[account_ids][]" } %>

将以上行写3次.

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