在 fields_for 循环中获取对象字段的值 [英] Get a value of object field inside fields_for loop

问题描述

在以下场景中，我需要检查 fields_for 循环中对象属性的值.

In the following scenario, I need to check the value of the object property in the fields_for loop.

<%= f.semantic_fields_for :review_details do |rd| %>
  <%= rd.input :review_criteria_id, :as=>:hidden %>
<% end %>

在循环中，:review_criteria_id 呈现为隐藏字段，但我有一个场景，如果它是特定标准，我必须打印更多信息.如何在循环中获取 review_criteria_id 的值.我用过:

As in the loop, :review_criteria_id is rendered as hidden field, but I have a scenario, where I have to print some more information if it is a specific criteria. How can I get the value of review_criteria_id in the loop. I used:

rd.review_criteria_id

但是由于rd 是formtastic 对象，所以我无法获取:review_crieteria_id 的值.

But since rd is the formtastic object, so I couldn't get the value of :review_crieteria_id.

推荐答案

Formtastic 为 Rails 代码添加了额外的功能，但不会删除现有的功能，因此以下内容应该适合您:

Formtastic adds additional features to the Rails code, but doesn't take away existing functionality so the following should work for you:

rd.object.review_criteria_id

'object' 可以在普通的 Rails 表单助手中使用来访问底层绑定对象，Formtastic 遵循这个约定.

'object' can be used in plain Rails form helpers to access the underlying bound object, and Formtastic honours this convention.

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