Active Admin表单上的动态调整下拉字段（Rails 3.2） [英] Dynamically-adjusting drop down fields on Active Admin form (rails 3.2)

问题描述

我在Ruby on Rails应用程序上有一个非常基本的体系结构：

I have a very basic architecture on my Ruby on Rails app:

• 公司模型

• a company model

一个行业模型（公司属于一个行业）

a Industry model (a company belongs to an industry)

a子行业模型（子行业属于

a Sub-industry model (a subindustry belongs to a Industry)

在我的活动管理表单页面上，我想输入字段，以便对每个公司来说首先从下拉列表中选择所属行业（到目前为止有效），然后选择另一个字段子行业，根据我在上一个字段中选择的行业，该字段将仅显示我之前已分类的子行业

On my active admin form page, I want to put fields so that for each company, I first select in a drop down the industry it belongs to (this works so far), and then another field "sub industry", that would ONLY display, according to the industry I selected in the previous field, the subindustries that I have categorized previously in this industry.

例如，古柯将进入饮料和饮料行业，我希望表格能够动态调整，仅在 sub字段中显示行业：带有热饮，冷饮，茶，苏打水的下拉列表

For example, coca would go in industry "Drinks and beverage" and I'd like the form to dynamically adjust and only show in the field "sub indsutry" :a dropdown with "hot drinks", "cold drinks", "tea", "sodas"

form do |f|

    f.inputs "Company" do

      f.input :company_industry_id,    :label => "Select industry:",             :as => :select, :collection => CompanyIndustry.all
      f.input :company_subindfustry_id, :label => "Select subindustry:",  :as => :select, :collection => CompanySubindustry.all
end

到目前为止，我显然有问题，它向我显示了全部我拥有的子行业，而不仅是我在上一个字段中选择的行业内的子行业。

Obviously I have a problem as so far, it show me ALL the subindustries I have and not only the subindustries WITHIN the industry I select on the previous field.

有人知道我能解决这个问题吗？

Does anyone know how I can solve that ?

推荐答案

您需要执行页面刷新以根据所选内容更新数据，或者（我个人偏好）执行AJAX调用以更新其他下拉列表。

You'll need to do either a page refresh to update data based on what's selected or (my preference) an AJAX call to update the other dropdown after the first one is selected.

有一个很棒的 railscast 就是这样做的-那将是一个不错的起点。

There's a great railscast on doing just this - that would be a great place to start.

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