Working in PG datastore.

models/users.go

@@ -1,6 +1,7 @@
 package models
 
 import (
+	"errors"
 	"strconv"
 	"time"
 
@@ -25,6 +26,10 @@ type UsersService interface {
 	List(opt *UserListOptions) ([]*User, error)
 }
 
+var (
+	ErrUserNotFound = errors.New("user not found")
+)
+
 type usersService struct {
 	client *Client
 }