Fix undoing a post deletion when the post had comments (thanks amw).

Closes xaviershay#13.

Author: xaviershay

app/models/delete_post_undo.rb

@@ -7,7 +7,7 @@ def process!
     transaction do
       post = Post.create!(post_attributes)
       loaded_data[:comments].each do |comment|
-        post.comments.create!(comment.except('id'))
+        post.comments.create!(comment.except('id', 'post_id'))
       end
       self.destroy
     end

spec/models/delete_post_undo_spec.rb

@@ -0,0 +1,14 @@
+require File.dirname(__FILE__) + '/../spec_helper'
+
+describe DeletePostUndo do
+  describe '#process!' do
+    it 'creates a new post with comments based on the attributes stored in #data' do
+      post = Post.create!(:title => 'a', :body => 'b').tap do |post|
+        post.comments.create!(:author => 'Don', :author_url => '', :author_email => '', :body => 'comment')
+      end
+      item = post.destroy_with_undo
+      new_post = item.process!
+      new_post.comments.count.should == 1
+    end
+  end
+end