I just came across a change in Rails 2.1 when converting an ActiveRecord object to JSON. The JSON output now includes the ActiveRecord model name in the object so if you have a user model and convert it to json, you get the following:
This becomes a pain when you're pulling this data via AJAX and you're doing something like this:
In your client side code, you then have to type user twice, once for the hash key, and once for the ActiveRecord model name, to get to the user's attributes:
Unnecessarily redundant and inconvenient. This seems to have been changed in Rails 2.1, but the old behavior can be restored by editing config/initializers/new_rails_default.rb and changing:
Restart your app, and you'll now get just the attributes for the model and not the model name.