Ruby on rails 访问/输出扁平散列中的值？

在我的控制器中，我有：

@invoices = current_user.account.clients.map(&:invoices).flatten

在我的index.html.erb中，我想显示这些值，目前我有以下内容：

<% @invoices.each do |invoice| %>
    <tr>
        <td></td>
        <td><%= invoice.client.name %></td>
        <td><%= invoice.jobs.inspect %></td> #HERE IS WHERE I WANT START_DATE, etc
        <td><%= invoice.created_at %></td>
        <td><%= link_to "PDF", invoice_path(invoice, :format => :pdf)%></td>
        <td><%= link_to invoice, :method => :delete, :confirm => 'Are you sure you want to delete this invoice' do %> <i class="icon-trash"></i><% end %>
    </td>
    </tr>
  <% end %>

[#<Job id: 15, start_date: "2012-03-24", due_date: "2012-03-31", notes: "grthryrth", audio_file_url: "1.txt", transcribed_file_url: "300.txt", status: "invoiced", account_id: 1, user_id: 1, client_id: 2, created_at: "2012-03-29 18:03:14", updated_at: "2012-03-29 18:40:49", invoice_id: 6>, #<Job id: 16, start_date: "2012-03-24", due_date: "2012-03-21", notes: "uopuiouioiio", audio_file_url: "Data Flow Analysis and Integration v1.1.docx", transcribed_file_url: "ECA-Sponsor Monthly Agenda 20120105.doc", status: "invoiced", account_id: 1, user_id: 4, client_id: 2, created_at: "2012-03-29 18:05:24", updated_at: "2012-03-29 18:40:49", invoice_id: 6>]

#这是我想要的开始日期等
：pdf）%>
：delete，：confirm=>'是否确实要删除此发票'do%>

invoice.jobs.inspect返回以下内容：

<% @invoices.each do |invoice| %>
    <tr>
        <td></td>
        <td><%= invoice.client.name %></td>
        <td><%= invoice.jobs.inspect %></td> #HERE IS WHERE I WANT START_DATE, etc
        <td><%= invoice.created_at %></td>
        <td><%= link_to "PDF", invoice_path(invoice, :format => :pdf)%></td>
        <td><%= link_to invoice, :method => :delete, :confirm => 'Are you sure you want to delete this invoice' do %> <i class="icon-trash"></i><% end %>
    </td>
    </tr>
  <% end %>

[#<Job id: 15, start_date: "2012-03-24", due_date: "2012-03-31", notes: "grthryrth", audio_file_url: "1.txt", transcribed_file_url: "300.txt", status: "invoiced", account_id: 1, user_id: 1, client_id: 2, created_at: "2012-03-29 18:03:14", updated_at: "2012-03-29 18:40:49", invoice_id: 6>, #<Job id: 16, start_date: "2012-03-24", due_date: "2012-03-21", notes: "uopuiouioiio", audio_file_url: "Data Flow Analysis and Integration v1.1.docx", transcribed_file_url: "ECA-Sponsor Monthly Agenda 20120105.doc", status: "invoiced", account_id: 1, user_id: 4, client_id: 2, created_at: "2012-03-29 18:05:24", updated_at: "2012-03-29 18:40:49", invoice_id: 6>]

[#，#]

---

如何单独访问每个值，例如invoice.jobs.start\u date？谢谢

方法不止一种：如果你不想搞砸

inspect

，你可以在你的作业模型中覆盖

inspect

，创建另一种方法（比如

pretty\u display

，随便什么），或者使用视图助手（比如

job\u pretty\u display（作业）

）。我会选择第三个选项。

如果你想获得发票，那么在我看来，浏览用户模型似乎有些倒退。考虑一下这样的事情：

@invoices = Invoice.joins( :client => { :accounts => :user } ).
                    include( :client, :jobs ).
                    where( "accounts.user_id" => current_user.id ).
                    all

但是，无论哪种方式，如果

invoice.jobs

是一个数组（其复数形式及其

inspect

输出中的方括号证明了这一点），则首先需要使用

[0]

或

first

访问数组的一个元素：

invoice.jobs.first.start_date
# => "2012-03-24"

---

谢谢因此，如果我在发票中有多个作业，我将如何显示这些作业？通过使用invoice.jobs[0]。开始日期显然只返回第一个jobs项的值，而不返回后续项的值。在这种情况下，您将循环遍历集合，例如，

invoice.jobs.each do | job |……

或。后者可能更“粗鲁”。