Errorf takes and error, a message string and a set of arguments and produces a new Error.

Is returns true if the particular error code in an Error is equal to the expected error.

ErrExists Item already exists.

ErrInternal Internal fatal error.

ErrInvalid Invalid request.

ErrNoAccess Access to item not allowed.

ErrNotFound Item not found.

Error holds the error code and additional messages.

The UserDBService provides a way for tracking and storing users.

Objects implements the UsersService provide an technology independent way of managing the applications users.