EnsuresImmutabilityOf

There are many cases where a model attribute should not be changed once it's set. This plugin makes it dead simple.

Example

class Account < ActiveRecord::Base ensures_immutability_of :username, :email end

account = Account.create(:username => 'jgreen') ... account.update(:username => 'jgreen') # raises ActiveRecord::ImmutableAttributeError

Collections can all be immutable as well (thanks to Dmitry Ratnikov on #rubyonrails)

class Account < ActiveRecord::Base has_many :infos ensures_immutability_of :username, :email, :infos # note: this must come after the has_many declaration, otherwise # AR will overwrite the setter end

account = Account.create(:username => 'wmoxam') account.infos = Info.find(:all, :conditions => ["id < ?", 3] account.infos = Info.find(:all, :conditions => ["id > ?", 3] # raises ActiveRecord::ImmutableAttributeError

Copyright (c) 2007-2008 Wesley Moxam - Savvica Inc, released under the MIT license