Created
December 13, 2010 01:44
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Demonstrate issue with class_attribute not cloning hash value in subclasses
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| require 'rubygems' | |
| require 'active_support/all' | |
| class Base | |
| class_attribute :settings | |
| class_inheritable_accessor :old_settings | |
| self.settings = { :foo => 'bar' } | |
| self.old_settings = { :foo => 'bar' } | |
| end | |
| class Child < Base | |
| self.settings.update(:foo => 'child_bar') | |
| self.old_settings.update(:foo => 'child_bar') | |
| end | |
| p "Base: class_attribute - " + Base.settings.inspect | |
| p "Base: class_inheritable_accessor - " + Base.old_settings.inspect | |
| p "Child: class_attribute - " + Child.settings.inspect | |
| p "Child: class_inheritable_accessor - " + Child.old_settings.inspect | |
| # On investigation into class_attribute, I read in the AS comments that this is by design. You need to assign a new | |
| # object to avoid overwriting the parent value. Like this: | |
| Child.settings = Base.settings.merge(:foo => 'child_bar') |
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