class ActiveRecord::Tasks::PostgreSQLDatabaseTasks

def create(master_established = false)
  establish_master_connection unless master_established
  connection.create_database configuration['database'],
    configuration.merge('encoding' => encoding)
  establish_connection configuration
rescue ActiveRecord::StatementInvalid => error
  if /database .* already exists/ === error.message
    raise DatabaseAlreadyExists
  else
    raise
  end
end