deep_reject.rb

require 'active_support/core_ext/object/deep_dup.rb'

class Object
  def deep_reject!(*keys)
    if is_a?(Hash)
      keys.each { |k| delete(k) }
      values.each { |v| v.deep_reject!(*keys) }
    elsif is_a?(Array)
      each { |x| x.deep_reject!(*keys) }
    end
    self
  end

  def deep_reject(*keys)
    if [Hash, Array].include? self.class
      deep_dup.deep_reject!(*keys)
    else
      self
    end
  end
end