foodsoft/db/migrate/20181204000000_clear_invalid_invoices_from_orders.rb

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class ClearInvalidInvoicesFromOrders < ActiveRecord::Migration[4.2]
class Order < ActiveRecord::Base; end
class Invoice < ActiveRecord::Base; end
def up
Order.where.not(invoice_id: Invoice.all).update_all(invoice_id: nil)
end
end