Deletes all user-defined roles on the database where you run the method.
The dropAllRoles method removes all user-defined roles from the database.
The dropAllRoles method takes the following argument:
Field Type Description writeConcern document Optional. The level of write concern for the removal operation. The writeConcern document takes the same fields as the getLastError command. Returns: The number of user-defined roles dropped.
The db.dropAllRoles() method wraps the dropAllRolesFromDatabase command.