final db structure

db/migrate/20170403163734_create_sale_payments.rb

@@ -0,0 +1,14 @@
+class CreateSalePayments < ActiveRecord::Migration[5.0]
+  def change
+    create_table :sale_payments do |t|
+      t.references :sale, foreign_key: true
+      t.string :payment_method, :null => false, :default => "cash"
+      t.decimal :payment_amount, :precision => 10, :scale => 2, :null => false, :default => 0.00
+      t.decimal :outstanding_amount, :precision => 10, :scale => 2, :null => false, :default => 0.00
+      t.string :payment_reference
+      t.string :payment_status, :null => false, :default => "new"
+
+      t.timestamps
+    end
+  end
+end