insert_id first support auto_increment field

callback_create.go

@@ -70,8 +70,8 @@ func Create(scope *Scope) {
 				id, err := result.LastInsertId()
 				if scope.Err(err) == nil {
 					scope.db.RowsAffected, _ = result.RowsAffected()
-					if primaryField != nil && primaryField.IsBlank {
-						scope.Err(scope.SetColumn(primaryField, id))
+					if autoIncrementField := scope.AutoIncrementField(); autoIncrementField != nil {
+						scope.Err(scope.SetColumn(autoIncrementField, id))
 					}
 				}
 			}

scope.go

@@ -109,16 +109,27 @@ func (scope *Scope) Log(v ...interface{}) {
 func (scope *Scope) HasError() bool {
 	return scope.db.Error != nil
 }
-
 func (scope *Scope) PrimaryField() *Field {
 	if primaryFields := scope.GetModelStruct().PrimaryFields; len(primaryFields) > 0 {
-		for i := 0; i < len(primaryFields); i++ {
-			if primaryFields[i].IsAutoIncrement {
-				return scope.Fields()[primaryFields[i].DBName]
+		if len(primaryFields) > 1 {
+			if field, ok := scope.Fields()["id"]; ok {
+				return field
+			}
+		}
+		return scope.Fields()[primaryFields[0].DBName]
+	}
+	return nil
+}
+
+func (scope *Scope) AutoIncrementField() *Field {
+	if structFields := scope.GetModelStruct().StructFields; len(structFields) > 0 {
+		for i := 0; i < len(structFields); i++ {
+			if structFields[i].IsAutoIncrement {
+				return scope.Fields()[structFields[i].DBName]
 			}
 		}
 	}
-	return nil
+	return scope.PrimaryField()
 }
 
 // PrimaryKey get the primary key's column name

structs_test.go

@@ -11,7 +11,7 @@ import (
 )
 
 type User struct {
-	Id                int64
+	Id                int64 `sql:"auto_increment"`
 	Age               int64
 	UserNum           Num
 	Name              string        `sql:"size:255"`