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ruby-on-railsruby

is there way to convert object into another class in ruby

let say I have model 

User < ActiveRecord::Base
end

and his STI brother

MasqueradeUser < User
end 

masquerade_user =  MasqueradeUser.find 123
masquerade_user.class
# => MasqueradeUser

Ridiculous as it sounds, is possible to convert this object back to parent class User

masquerade_user.some_magic.class   # => User

I know I can override methods like mode_name, is_a?(User) and other so that MasqueradeUser will return values like User

MasqueradeUser < User
  def model_name
    'User'
  end
end

I was just wondering if there is a way to completely downgrade object to parent class instance

Solution

  • You can use becomes function of ActiveRecord - see here.