commission in sale edit

app/models/product_commission.rb

@@ -1,2 +1,11 @@
 class ProductCommission < ApplicationRecord
+  belongs_to :commission, foreign_key: 'commission_id'
+  belongs_to :commissioner, foreign_key: 'commissioner_id'
+  belongs_to :menu_item, foreign_key: 'product_id'
+  belongs_to :sale_item, foreign_key: 'sale_item_id'
+  belongs_to :sale, foreign_key: 'sale_id'
+
+  def self.check_product_commission(sale_item_id)
+
+  end
 end