From bc0f5373150d267d7e954bce8108f06719d15c6e Mon Sep 17 00:00:00 2001
From: Ben Simpson <thehoagie@gmail.com>
Date: Mon, 26 Jul 2010 21:47:46 -0400
Subject: [PATCH] Added a "revisable_changes" column to the model being revised
   Column records information generated from ActiveRecord's instance class
 "changes" on save

---
 .../revisable_migration/revisable_migration_generator.rb      | 3 ++-
 lib/acts_as_revisable/acts/revisable.rb                       | 4 ++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/generators/revisable_migration/revisable_migration_generator.rb b/generators/revisable_migration/revisable_migration_generator.rb
index 4e2d6a1..f1b40ea 100644
--- a/generators/revisable_migration/revisable_migration_generator.rb
+++ b/generators/revisable_migration/revisable_migration_generator.rb
@@ -10,7 +10,8 @@ def manifest
         ["revisable_current_at",       "datetime"],
         ["revisable_revised_at",       "datetime"],
         ["revisable_deleted_at",       "datetime"],
-        ["revisable_is_current",       "boolean", 1]
+        ["revisable_is_current",       "boolean", 1],
+        ["revisable_changes",         "string"]
       ]
       
       m.migration_template 'migration.rb', 'db/migrate',
diff --git a/lib/acts_as_revisable/acts/revisable.rb b/lib/acts_as_revisable/acts/revisable.rb
index ac4d1ba..f970b79 100644
--- a/lib/acts_as_revisable/acts/revisable.rb
+++ b/lib/acts_as_revisable/acts/revisable.rb
@@ -24,8 +24,10 @@ class << base
         base.class_inheritable_hash :revisable_shared_objects
         base.revisable_shared_objects = {}
         
+
         base.instance_eval do
           attr_accessor :revisable_new_params, :revisable_revision
+          serialize :revisable_changes
           
           define_callbacks :before_revise, :after_revise, :before_revert, :after_revert, :before_changeset, :after_changeset, :after_branch_created
                     
@@ -296,6 +298,7 @@ def save(*args) #:nodoc:
       def before_revisable_create #:nodoc:
         self[:revisable_is_current] = true
         self.revision_number ||= 0
+        self.revisable_changes = self.changes
       end
       
       # Checks whether or not a +Revisable+ should be revised.
@@ -319,6 +322,7 @@ def before_revisable_update #:nodoc:
           return false
         end
         
+        self.revisable_changes = self.changes
         self.revisable_revision = self.to_revision
       end