DB for promtion, promotion product,product

db/migrate/20170815051517_create_promotion_product.rb

@@ -0,0 +1,13 @@
+class CreatePromotionProduct < ActiveRecord::Migration[5.1]
+  def change
+    create_table :promotion_products do |t|
+      t.references :promotion, foreign_key: true
+      t.string :item_code, :null => false
+      t.integer :min_qty
+      t.integer :net_off
+      t.integer :net_price
+      t.integer :percentage
+      t.timestamps
+    end
+  end
+end