Basically I am using some engines whose model class uses some gems like `acts_as_x`. To override the model I use class\_eval but I don't need `acts_as_x` functionalities because it makes heavy calculations that I don't need.

Is there anyway to disable this function? 

Thanks,

Updated:

```
# origin model
class Model < ActiveRecord::Base
 acts_as_x
end

# overriding model
Model.class_eval do 
  acts_as_y
  # it musts remove acts_as_x
end

```