really_destroy! will now really destroy dependent = :destroy associated records

Fixes #117

lib/paranoia.rb

@@ -90,12 +90,17 @@ module Paranoia
   # insert time to paranoia column.
   # @param with_transaction [Boolean] exec with ActiveRecord Transactions.
   def touch_paranoia_column(with_transaction=false)
+    # This method is (potentially) called from really_destroy
+    # The object the method is being called on may be frozen
+    # Let's not touch it if it's frozen.
+    unless self.frozen?
       if with_transaction
         with_transaction_returning_status { touch(paranoia_column) }
       else
         touch(paranoia_column)
       end
     end
+  end
 
   # restore associated records that have been soft deleted when
   # we called #destroy
@@ -122,9 +127,20 @@ end
 
 class ActiveRecord::Base
   def self.acts_as_paranoid(options={})
-    alias :really_destroy! :destroy
     alias :destroy! :destroy
     alias :delete! :delete
+    def really_destroy!
+      dependent_reflections = self.reflections.select do |name, reflection|
+        reflection.options[:dependent] == :destroy
+      end
+      if dependent_reflections.any?
+        dependent_reflections.each do |name, _|
+          self.send(name).each(&:really_destroy!)
+        end
+      end
+      destroy!
+    end
+
     include Paranoia
     class_attribute :paranoia_column
 

test/paranoia_test.rb

@@ -287,13 +287,20 @@ class ParanoiaTest < test_framework
     assert model.instance_variable_get(:@restore_callback_called)
   end
 
-  def test_real_destroy
+  def test_really_destroy
     model = ParanoidModel.new
     model.save
     model.really_destroy!
     refute ParanoidModel.unscoped.exists?(model.id)
   end
 
+  def test_real_destroy_dependent_destroy
+    parent = ParentModel.create
+    child = parent.very_related_models.create
+    parent.really_destroy!
+    refute RelatedModel.unscoped.exists?(child.id)
+  end
+
   if ActiveRecord::VERSION::STRING < "4.1"
     def test_real_destroy
       model = ParanoidModel.new