Created promotion seed

core/db/default/spree/promotions.rb

@@ -0,0 +1,23 @@
+Spree::Sample.load_sample('option_values')
+Spree::Sample.load_sample('products')
+
+product = Spree::Product.find_by(name: 'Ruby on Rails Baseball Jersey')
+size = Spree::OptionValue.find_by(name: 'Small')
+color = Spree::OptionValue.find_by(name: 'Red')
+eligible_values = "#{size.id},#{color.id}"
+
+promotion = Spree::Promotion.where(
+  name: 'free shipping',
+  usage_limit: nil,
+  path: nil,
+  match_policy: 'any',
+  description: ''
+).first_or_create
+
+Spree::PromotionRule.where(
+  promotion_id: promotion.id,
+  type: 'Spree::Promotion::Rules::OptionValue',
+  preferences: { match_policy: 'any', eligible_values: { product.id.to_s => eligible_values } }
+).first_or_create
+
+Spree::Promotion::Actions::FreeShipping.where(promotion_id: promotion.id).first_or_create