ruby on rails -使用两个以上的模型显示操作

Question

我有一个包含许多y_invoice项的发票模型

class Invoice < ActiveRecord::Base
  belongs_to :customer, :inverse_of => :invoices
  attr_accessible :approved_by, :due_date, :invoice_date, :reading_ids, :terms, :customer_id, :customer, :status
  validates :invoice_date, presence: true
  validates :due_date, presence: true
  validates :customer, presence: true
  has_many :invoice_items
  accepts_nested_attributes_for :invoice_items
end

发票项目模型

class InvoiceItem < ActiveRecord::Base
  belongs_to :invoice
  attr_accessible :amount, :description, :rate, :tax_amount
end

我现在在我的Invoices_controller

中有一个显示动作

def show
@invoice = Invoice.find(params[:id])
respond_to do |format|
    format.html
end
end

我希望能够在发票的显示页面中显示invoice_items，如描述、税额和税率，但是，这给我带来了相当大的挑战。我需要在里面创建一个部分来处理发票项目吗?下面是我的show页面

<p id="notice"><%= notice %></p>
<div class="row">
<div class="span12">
    <h3> Customer Invoices </h3>
<table class="table table-striped">
  <thead>
    <tr>
      <th>Invoice ID </th>
      <th>Customer Name </th>
      <th>Invoice Date </th>
      <th>Due Date </th>
      <th>Amount</th>     
   </tr>
</thead>
<tbody>
  <tr>
    <td><%= @invoice.customer.name %></td>
    <td><%= @invoice.invoice_date %></td>
    <td><%= @invoice.due_date %></td>   
  </tr>
</tbody>
</table>
</div>
</div>

Answer 1

不是必须使用partial，但您可以使用两种方法

1 -不包含部分

in your show.html.erb
#your invoice code
<% invoice_items = @invoice.invoice_items %>
<% invoice_items.each to |invoice_item|%>
<tr>
  <td><%= invoice_item.amount%></td>
</tr>
<% end %>

2)与部分

in your show.html.erb
#your invoice code
    <% invoice_items = @invoice.invoice_items %>
    <% invoice_items.each to |invoice_item|%>
    <tr>
      <td>
         <%= render :partial => 'invoice_item', :locals => {:item => invoice_item}%>
      </td>
    </tr>
    <% end %>
 in your _invoice_item.html.erb
 <%= item.name %>

HTH

Answer 2

你可以使用局部来保持整洁，但是你也可以在你的显示视图模板中这样做。

<% @invoice.invoice_items.each do |item| %>
 <td><%= item.amount %></td>
 <td><%= item.description %></td>
 # etc
<% end %>

发票项与您视图中的@invoice对象相关，因此您可以访问发票invoice_items。