Notify observers of paranoid restores

lib/paranoia.rb

@@ -89,6 +89,13 @@ class ActiveRecord::Base
 
     self.paranoia_column = options[:column] || :deleted_at
     default_scope { where(self.quoted_table_name + ".#{paranoia_column} IS NULL") }
+
+    before_restore {
+      self.class.notify_observers(:before_restore, self) if self.class.respond_to?(:notify_observers)
+    }
+    after_restore {
+      self.class.notify_observers(:after_restore, self) if self.class.respond_to?(:notify_observers)
+    }
   end
 
   def self.paranoid? ; false ; end

test/paranoia_test.rb

@@ -305,6 +305,22 @@ class ParanoiaTest < Test::Unit::TestCase
     refute c.destroyed?
   end
 
+  def test_observers_notified
+    a = ParanoidModelWithObservers.create
+    a.destroy
+    a.restore!
+
+    assert a.observers_notified.select {|args| args == [:before_restore, a]}
+    assert a.observers_notified.select {|args| args == [:after_restore, a]}
+  end
+
+  def test_observers_not_notified_if_not_supported
+    a = ParanoidModelWithObservers.create
+    a.destroy
+    a.restore!
+    # essentially, we're just ensuring that this doesn't crash
+  end
+
   private
   def get_featureful_model
     FeaturefulModel.new(:name => "not empty")
@@ -378,3 +394,17 @@ end
 class CustomColumnModel < ActiveRecord::Base
   acts_as_paranoid column: :destroyed_at
 end
+
+class ParanoidModelWithObservers < ParanoidModel
+  def observers_notified
+    @observers_notified ||= []
+  end
+
+  def self.notify_observer(*args)
+    observers_notified << args
+  end
+end
+
+class ParanoidModelWithoutObservers < ParanoidModel
+  self.class.send(remove_method :notify_observers) if method_defined?(:notify_observers)
+end