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module SelectiveClone
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extend ActiveSupport::Concern
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included do
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cattr_accessor :cloned_parameters
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# don't use Hash.new { [] }. deep_clone tries to fetch other keys from this hash,
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# and gets confused if the value is an empty array.
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self.cloned_parameters = {}
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self.cloned_parameters[:include] = []
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self.cloned_parameters[:except] = []
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def self.include_in_clone(*attributes)
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cloned_parameters[:include] += attributes
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end
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def self.exclude_from_clone(*attributes)
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cloned_parameters[:except] += attributes
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end
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end
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def selective_clone
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self.deep_clone(self.cloned_parameters)
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end
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end
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