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class Hash
  # Return a hash that includes everything but the given keys. This is useful for
  # limiting a set of parameters to everything but a few known toggles:
  #
  # @person.update_attributes(params[:person].except(:admin))
  #
  # If the receiver responds to +convert_key+, the method is called on each of the
  # arguments. This allows +except+ to play nice with hashes with indifferent access
  # for instance:
  #
  # {:a => 1}.with_indifferent_access.except(:a) # => {}
  # {:a => 1}.with_indifferent_access.except("a") # => {}
  #
  def except(*keys)
    dup.except!(*keys)
  end

  # Replaces the hash without the given keys.
  def except!(*keys)
    keys.each { |key| delete(key) }
    self
  end
end
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