Method: Mongo::Session#validate_read_preference!

Defined in:
lib/mongo/session.rb

#validate_read_preference!(command) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Ensure that the read preference of a command primary.

Examples:

session.validate_read_preference!(command)

Raises:

Since:

  • 2.6.0



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# File 'lib/mongo/session.rb', line 918

def validate_read_preference!(command)
  return unless in_transaction?
  return unless command['$readPreference']

  mode = command['$readPreference']['mode'] || command['$readPreference'][:mode]

  if mode && mode != 'primary'
    raise Mongo::Error::InvalidTransactionOperation.new(
      "read preference in a transaction must be primary (requested: #{mode})"
    )
  end
end