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vendor/rails/activeresource/test/setter_trap.rb

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class SetterTrap < ActiveSupport::BasicObject

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  class << self

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    def rollback_sets(obj)

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      trapped = new(obj)

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      yield(trapped).tap { trapped.rollback_sets }

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    end

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  end

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  def initialize(obj)

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    @cache = {}

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    @obj = obj

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  end

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  def respond_to?(method)

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    @obj.respond_to?(method)

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  end

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  def method_missing(method, *args, &proc)

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    @cache[method] ||= @obj.send($`) if method.to_s =~ /=$/

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    @obj.send method, *args, &proc

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  end

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  def rollback_sets

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    @cache.each { |k, v| @obj.send k, v }

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  end

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end

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