From 81c00fdc8fcab379c0c7741bb59b7b8df5535dc7 Mon Sep 17 00:00:00 2001
From: Jinzhu <wosmvp@gmail.com>
Date: Tue, 18 Aug 2015 11:06:10 +0800
Subject: [PATCH] Don't add duplicated error

---
 errors.go | 13 ++++++++++++-
 main.go   |  8 ++++----
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/errors.go b/errors.go
index 23fedd7f..9dfcd2e9 100644
--- a/errors.go
+++ b/errors.go
@@ -26,7 +26,18 @@ func (errs Errors) GetErrors() []error {
 }
 
 func (errs *Errors) Add(err error) {
-	errs.errors = append(errs.errors, err)
+	if errors, ok := err.(errorsInterface); ok {
+		for _, err := range errors.GetErrors() {
+			errs.Add(err)
+		}
+	} else {
+		for _, e := range errs.errors {
+			if err == e {
+				return
+			}
+		}
+		errs.errors = append(errs.errors, err)
+	}
 }
 
 func (errs Errors) Error() string {
diff --git a/main.go b/main.go
index d1898142..50aeb49c 100644
--- a/main.go
+++ b/main.go
@@ -518,10 +518,10 @@ func (s *DB) AddError(err error) error {
 				s.log(err)
 			}
 
-			if e, ok := err.(errorsInterface); ok {
-				err = Errors{errors: append(s.GetErrors(), e.GetErrors()...)}
-			} else {
-				err = Errors{errors: append(s.GetErrors(), err)}
+			errors := Errors{errors: s.GetErrors()}
+			errors.Add(err)
+			if len(errors.GetErrors()) > 1 {
+				err = errors
 			}
 		}