Add Model.restore(ids) function

Modelled on AR::Relation.destroy

lib/paranoia.rb

@@ -13,6 +13,14 @@ module Paranoia
     def with_deleted
       all.tap { |x| x.default_scoped = false }
     end
+
+    def restore(id)
+      if id.is_a?(Array)
+        id.map { |one_id| restore(one_id) }
+      else
+        only_deleted.find(id).restore!
+      end
+    end
   end
 
   def destroy

test/paranoia_test.rb

@@ -71,7 +71,7 @@ class ParanoiaTest < Test::Unit::TestCase
     assert_equal 0, model.class.count
     assert_equal 1, model.class.unscoped.count
   end
-  
+
   def test_scoping_behavior_for_paranoid_models
     ParanoidModel.unscoped.delete_all
     parent1 = ParentModel.create
@@ -204,6 +204,33 @@ class ParanoiaTest < Test::Unit::TestCase
     refute ParanoidModel.unscoped.exists?(model.id)
   end
 
+  def test_multiple_restore
+    a = ParanoidModel.new
+    a.save
+    a_id = a.id
+    a.destroy
+
+    b = ParanoidModel.new
+    b.save
+    b_id = b.id
+    b.destroy
+
+    c = ParanoidModel.new
+    c.save
+    c_id = c.id
+    c.destroy
+
+    ParanoidModel.restore([a_id, c_id])
+
+    a.reload
+    b.reload
+    c.reload
+
+    refute a.destroyed?
+    assert b.destroyed?
+    refute c.destroyed?
+  end
+
   private
   def get_featureful_model
     FeaturefulModel.new(:name => "not empty")