Redmine

This is the old environment from which the database is coming from:

Ruby version              1.8.7 (x86_64-linux)
RubyGems version          1.8.24
Rails version             2.3.17
Database adapter          mysql

And this is the target environment:

  Redmine version                2.4.2.stable
  Ruby version                   1.9.3-p194 (2012-04-20) [x86_64-linux]
  Rails version                  3.2.16
  Database adapter               Mysql2

In the old environment a Symbol object is serialized as

>> :add_project.to_yaml
=> "--- !ruby/sym add_project" 

instead of

>> :add_project.to_yaml
=> "--- :add_project\n" 

I don't know the reason of this difference, though both are valid YAML representations of a Symbol object.

My setup is serializing this way because it uses a plugin which replaces YAML with ZAML

To avoid hitting this bug use this patch

--- a/app/models/role.rb
+++ b/app/models/role.rb
@@ -58,7 +58,7 @@ class Role < ActiveRecord::Base
   has_many :members, :through => :member_roles
   acts_as_list

-  serialize :permissions, ::Role::PermissionsAttributeCoder
+  serialize :permissions
   attr_protected :builtin

   validates_presence_of :name