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module InterfaceCloning
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extend ActiveSupport::Concern
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# we keep the before update host object in order to compare changes
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def setup_clone(&block)
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return if new_record?
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@old = setup_object_clone(self, &block)
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end
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def setup_object_clone(object)
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clone = object.dup
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yield(clone) if block_given?
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# we can't assign using #attributes= because of mass-assign protected attributes (e.g. type)
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for key in (object.changed_attributes.keys - ["updated_at"])
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clone.send "#{key}=", object.changed_attributes[key]
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end
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clone
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end
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end
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