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Question

我有一个客户和发票模型。客户有许多发票和发票属于客户。

class Customer < ActiveRecord::Base 
attr_accessible :billing_address, :customer_currency, :email, :first_name, :last_name, :mobile, :name, :payment_terms, :phase_type, :pays_vat 
validates_presence_of :first_name, :last_name, :mobile, :billing_address, :payment_terms, :phase_type, :customer_currency 

has_many :invoices 

validates :email, 
     :presence => true, 
     :uniqueness => true, 
     :email_format => true 

validates :name, :mobile, :presence => true, :uniqueness => true 
end 

发票型号是

class Invoice < ActiveRecord::Base 
belongs_to :customer 
attr_accessible :approved_by, :due_date, :invoice_date, :terms, :customer_id, :customer 

validates :invoice_date, presence: true 
validates :due_date, presence: true 
validates :customer, presence: true 

我试图创建一个索引页，其中列出了系统中所有的发票，这将发票显示谁发票所属的客户名称。我如何检索并在我的模型和视图中清楚地描述它？

Answer 1

我认为您已经创建了客户和发票控制器和视图（如果不通过generate scaffold）。在意见\发票\ index.html.erb然后列出发票：

<table> 
    <tr> 
    <th>Invoice</th> 
    <th>Customer/th> 
    </tr> 
<% @invoices.each do |invoice| %> 
    <tr> 
    <td><%= invoice.num %></td> 
    <td><%= invoice.customer.first_name %></td> 
    </tr> 
<% end %> 
</table> 

当然，你应该在控制器声明@invoices/invoices_controller.rb

def index 
    @invoices = Invoice.includes(:customer).all 
end