在ActiveAdmin索引视图列中显示子属性/嵌套属性 [英] Show child/nested attributes in ActiveAdmin index view column

问题描述

我试图在ActiveAdmin中显示嵌套属性的值。

I'm trying to show the value of a nested attribute in ActiveAdmin.

我的代码如下：

index do
  column :code
  column 'Sales Agent' do |client|
    client.sales_agent.agent_name
  end
end

我：

NoMethodError in Admin/client_branches#index

Showing /Users/constantlm/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.4.3/app/views/active_admin/resource/index.html.arb where line #1 raised:

undefined method `agent_name' for nil:NilClass

我不明白为什么这行不通，因为当我这样做时以下内容：

I don't understand why this doesn't work, because when I do the following:

index do
  column :code
  column 'Sales Agent' do |client|
    raise client.sales_agent.agent_name.inspect
  end
end

输出：

RuntimeError in Admin/client_branches#index

Showing /Users/constantlm/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.4.3/app/views/active_admin/resource/index.html.arb where line #1 raised:

"Peter John"

我希望第一条语句也能做到这一点（指彼得·约翰），但事实并非如此。我缺少什么？

Which is what I would expect the first statement to do as well (referring to the "Peter John"), but it's not. What am I missing?

推荐答案

清除记录并从新记录开始。另外，如果！client.sales_agent.nil是否尝试添加

Clear your records and start with new records. Additionally try adding

    client.sales_agent.agent_name if !client.sales_agent.nil?

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