From 495ec4bd87e9fb7751e7d5d10f9feae7c671eef0 Mon Sep 17 00:00:00 2001
From: heige <daheige@users.noreply.github.com>
Date: Sun, 7 Mar 2021 10:56:32 +0800
Subject: [PATCH] invalid db error and value and invalid value length error
 (#4151)

---
 association.go | 3 +--
 callbacks.go   | 2 +-
 errors.go      | 6 ++++++
 gorm.go        | 3 +--
 4 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/association.go b/association.go
index 3a2942fd..572f1526 100644
--- a/association.go
+++ b/association.go
@@ -1,7 +1,6 @@
 package gorm
 
 import (
-	"errors"
 	"fmt"
 	"reflect"
 	"strings"
@@ -441,7 +440,7 @@ func (association *Association) saveAssociation(clear bool, values ...interface{
 				break
 			}
 
-			association.Error = errors.New("invalid association values, length doesn't match")
+			association.Error = ErrInvalidValueOfLength
 			return
 		}
 
diff --git a/callbacks.go b/callbacks.go
index d1b8cd58..5b878af0 100644
--- a/callbacks.go
+++ b/callbacks.go
@@ -104,7 +104,7 @@ func (p *processor) Execute(db *DB) {
 			stmt.ReflectValue = stmt.ReflectValue.Elem()
 		}
 		if !stmt.ReflectValue.IsValid() {
-			db.AddError(fmt.Errorf("invalid value"))
+			db.AddError(ErrInvalidValue)
 		}
 	}
 
diff --git a/errors.go b/errors.go
index 08755083..5f464d2b 100644
--- a/errors.go
+++ b/errors.go
@@ -31,4 +31,10 @@ var (
 	ErrEmptySlice = errors.New("empty slice found")
 	// ErrDryRunModeUnsupported dry run mode unsupported
 	ErrDryRunModeUnsupported = errors.New("dry run mode unsupported")
+	// ErrInvaildDB invalid db
+	ErrInvaildDB = errors.New("invalid db")
+	// ErrInvalidValue invalid value
+	ErrInvalidValue = errors.New("invalid value")
+	// ErrInvalidValueOfLength invalid values do not match length
+	ErrInvalidValueOfLength = errors.New("invalid association values, length doesn't match")
 )
diff --git a/gorm.go b/gorm.go
index f11fb9e1..0eb377e9 100644
--- a/gorm.go
+++ b/gorm.go
@@ -3,7 +3,6 @@ package gorm
 import (
 	"context"
 	"database/sql"
-	"errors"
 	"fmt"
 	"sync"
 	"time"
@@ -331,7 +330,7 @@ func (db *DB) DB() (*sql.DB, error) {
 		return sqldb, nil
 	}
 
-	return nil, errors.New("invalid db")
+	return nil, ErrInvaildDB
 }
 
 func (db *DB) getInstance() *DB {