Question

I’m using rails 2.3.4, rubygems 1.8.24, mac os x lion and ruby 1.9.3

I’m trying to render xml to an object called invoice. Now, i associated invoice with invoice_detail, so in my render :xml i wrote:

format.xml  { render :xml => @invoice.to_xml(:include => :invoice_detail) }

but an error occurs: ActiveRecord::StatementInvalid Invalid column name ‘invoice_id’

i have no invoice_id column in my db, and now i want rails to understand that. I want it to look at the inventoryDocId column instead of looking for an invoice_id column that doesn’t exist. How do i do that? Thank you very much.

Answer 1

When you created your model invoice_detail you have to specify the foreign key column :

class InvoiceDetail < ActiveRecord::Base
  belongs_to :invoice, :foreign_key => "inventoryDocId"
end

You have belongs_to options here : http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#method-i-belongs_to