paper_trail gives me errors with existing User model

Question

Is there any conflict to set a User model to be versioned with paper_trail? I have a model 'User' as follows:

class User < ActiveRecord::Base
  has_paper_trail

end

The problem is that whenever I call user#versions I get an exception:

ActiveRecord::StatementInvalid: Mysql2::Error: Unknown column 'versions.user_id' in 'where clause': SELECT `versions`.* FROM `versions` WHERE (`versions`.user_id = 6)

(exception thrown when called versions on a User with id = 6.

I also have problem when I am trying to save a User. I get the following exception:

ActiveRecord::StatementInvalid: Mysql2::Error: Column 'item_id' cannot be null: INSERT INTO `versions` (`event`, `created_at`, `item_id`, `item_type`, `object`, `whodunnit`) VALUES ('update', '2011-11-17 10:38:43', NULL, NULL, '--- ....

which seems that save does not populate the item_id and item_type.

Any help would be much appreciated.

Thanks in advance

Answer 1

The problem was that I had also added has_many :versions in my User model and there was a conflict.

To avoid the conflict, I followed what the paper_trail mentions in the documentation:

has_paper_trail :versions => :paper_trail_versions