Add tests for updated_at will be updated when update value with Assign

main.go

@@ -8,8 +8,8 @@ import (
 
 type DB struct {
 	Value         interface{}
-	callback      *callback
 	Error         error
+	callback      *callback
 	db            sqlCommon
 	parent        *DB
 	search        *search

main_test.go

@@ -10,7 +10,6 @@ import (
 	"github.com/jinzhu/gorm"
 	_ "github.com/lib/pq"
 	_ "github.com/mattn/go-sqlite3"
-	_ "github.com/mattn/go-sqlite3"
 
 	"os"
 	"reflect"
@@ -1105,6 +1104,12 @@ func TestFindOrCreate(t *testing.T) {
 		t.Errorf("user should be created with search value and attrs")
 	}
 
+	updated_at1 := user4.UpdatedAt
+	db.Where(&User{Name: "find or create 3"}).Assign("age", 55).FirstOrCreate(&user4)
+	if updated_at1.Format(time.RFC3339Nano) == user4.UpdatedAt.Format(time.RFC3339Nano) {
+		t.Errorf("UpdateAt should be changed when update values with assign")
+	}
+
 	db.Where(&User{Name: "find or create 4"}).Assign(User{Age: 44}).FirstOrCreate(&user4)
 	if user4.Name != "find or create 4" || user4.Id == 0 || user4.Age != 44 {
 		t.Errorf("user should be created with search value and assigned attrs")

scope_private.go

@@ -324,7 +324,7 @@ func (scope *Scope) sqlTagForField(field *Field) (tag string) {
 		}
 	}
 
-	if len(tag) == 0 && tag != "-" {
+	if len(tag) == 0 {
 		if field.isPrimaryKey {
 			tag = scope.Dialect().PrimaryKeyTag(value, size)
 		} else {