Shipping Category: Add dependent: options

Author: mamhoff

core/app/models/spree/shipping_category.rb

@@ -5,8 +5,8 @@ class ShippingCategory < Spree::Base
     self.allowed_ransackable_attributes = %w[name]
 
     validates :name, presence: true
-    has_many :products, inverse_of: :shipping_category
-    has_many :shipping_method_categories, inverse_of: :shipping_category
+    has_many :products, inverse_of: :shipping_category, dependent: :restrict_with_error
+    has_many :shipping_method_categories, inverse_of: :shipping_category, dependent: :destroy
     has_many :shipping_methods, through: :shipping_method_categories
   end
 end