Question

I have a Customer and Invoice Model. A customer has many invoices and an invoice belongs_to a customer.

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

Invoice Model is

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

I am trying to create an index page that lists all the invoices in the system and this will invoice showing a customer Name to whom the invoice belongs. How can i retrieve that and clearly depict it in my model and view?

Answer 1

I think you’ve already created customer and invoice controllers and views (if not do it by generate scaffold). Then list invoices in views\invoices\index.html.erb:

<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>

Of course, you should declare @invoices in controllers/invoices_controller.rb

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