adding "restore_revision" functionality to the backend

2 files changed, 31 insertions, 0 deletions

diff --git a/app/models/node.rb b/app/models/node.rb
index b56dff5..0b92708 100644
--- a/app/models/node.rb
+++ b/app/models/node.rb
@@ -81,6 +81,15 @@ class Node < ActiveRecord::Base
     end
   end
   
+  def restore_revision! revision
+    if page = self.pages.find_by_revision(revision)
+      self.head = page
+      self.save
+    else
+      nil
+    end
+  end
+  
   # returns an array with all parts of a unique_name rather than a string
   def unique_path
     unique_name.split("/") rescue unique_name
diff --git a/test/unit/node_test.rb b/test/unit/node_test.rb
index 817c6f9..e054887 100644
--- a/test/unit/node_test.rb
+++ b/test/unit/node_test.rb
@@ -235,4 +235,26 @@ class NodeTest < ActiveSupport::TestCase
     assert_not_nil test_node.draft
     assert test_node.head != test_node.draft
   end
+  
+  test "restoring a revision" do
+    test_node = Node.create! :slug => "test_node"
+    test_node.move_to_child_of Node.root
+    create_revisions( test_node, 3 )
+    test_node.find_or_create_draft @user1
+    test_node.reload
+    
+    assert_equal 4, test_node.pages.count
+    assert_equal 3, test_node.head.revision
+    
+    test_node.restore_revision!(1)
+    assert_equal 1, test_node.head.revision
+    assert_equal 4, test_node.draft.revision
+  end
+  
+  def create_revisions node, count
+    count.times do
+      node.find_or_create_draft @user1
+      node.publish_draft!
+    end
+  end
 end