package service type badRequestError struct { message string } func (e *badRequestError) Error() string { return e.message } func (e *badRequestError) BadRequestError() []map[string]string { return nil } type alreadyExistsError struct{} func (a alreadyExistsError) Error() string { return "Entity already exists" } func (a alreadyExistsError) IsExists() bool { return true }