Yay, callbacks works

model.go

@@ -122,12 +122,14 @@ func (m *Model) TableName() string {
 	return reg.ReplaceAllString(toSnake(t.Name()), "s")
 }
 
-func (model *Model) callMethod(method string) error {
-	fm := reflect.ValueOf(model).MethodByName(method)
+func (m *Model) callMethod(method string) error {
+	fm := reflect.ValueOf(m.Data).MethodByName(method)
 	if fm.IsValid() {
 		v := fm.Call([]reflect.Value{})
-		if verr, ok := v[0].Interface().(error); ok {
-			return verr
+		if len(v) > 0 {
+			if verr, ok := v[0].Interface().(error); ok {
+				return verr
+			}
 		}
 	}
 	return nil

orm.go

@@ -110,9 +110,9 @@ func (s *Orm) Select(value interface{}) *Orm {
 func (s *Orm) Save(value interface{}) *Orm {
 	s.Model(value)
 	if s.model.PrimaryKeyIsEmpty() {
-		s.explain(value, "Create").create(value)
+		s.create(value)
 	} else {
-		s.explain(value, "Update").update(value)
+		s.update(value)
 	}
 	return s
 }

orm_test.go

@@ -1,6 +1,7 @@
 package gorm
 
 import (
+	"reflect"
 	"testing"
 	"time"
 )
@@ -14,6 +15,20 @@ type User struct {
 	UpdatedAt time.Time
 }
 
+type Product struct {
+	Id                    int64
+	Code                  string
+	Price                 int64
+	CreatedAt             time.Time
+	UpdatedAt             time.Time
+	BeforeCreateCallTimes int64
+	AfterCreateCallTimes  int64
+	BeforeUpdateCallTimes int64
+	AfterUpdateCallTimes  int64
+	BeforeSaveCallTimes   int64
+	AfterSaveCallTimes    int64
+}
+
 var (
 	db                 DB
 	t1, t2, t3, t4, t5 time.Time
@@ -22,11 +37,13 @@ var (
 func init() {
 	db, _ = Open("postgres", "user=gorm dbname=gorm sslmode=disable")
 	db.Exec("drop table users;")
+	db.Exec("drop table products;")
 
 	orm := db.CreateTable(&User{})
 	if orm.Error != nil {
 		panic("No error should raise when create table")
 	}
+	db.CreateTable(&Product{})
 
 	var shortForm = "2006-01-02 15:04:05"
 	t1, _ = time.Parse(shortForm, "2000-10-27 12:02:40")
@@ -311,3 +328,55 @@ func TestCreatedAtAndUpdatedAt(t *testing.T) {
 		t.Errorf("Updated At should be changed after update")
 	}
 }
+
+func (s *Product) BeforeCreate() {
+	s.BeforeCreateCallTimes = s.BeforeCreateCallTimes + 1
+}
+
+func (s *Product) BeforeUpdate() {
+	s.BeforeUpdateCallTimes = s.BeforeUpdateCallTimes + 1
+}
+
+func (s *Product) BeforeSave() {
+	s.BeforeSaveCallTimes = s.BeforeSaveCallTimes + 1
+}
+
+func (s *Product) AfterCreate() {
+	s.AfterCreateCallTimes = s.AfterCreateCallTimes + 1
+}
+
+func (s *Product) AfterUpdate() {
+	s.AfterUpdateCallTimes = s.AfterUpdateCallTimes + 1
+}
+
+func (s *Product) AfterSave() {
+	s.AfterSaveCallTimes = s.AfterSaveCallTimes + 1
+}
+
+func (p *Product) GetCallTimes() []int64 {
+	return []int64{p.BeforeCreateCallTimes, p.BeforeSaveCallTimes, p.BeforeUpdateCallTimes, p.AfterCreateCallTimes, p.AfterSaveCallTimes, p.AfterUpdateCallTimes}
+}
+
+func TestRunCallbacks(t *testing.T) {
+	p := Product{Code: "unique_code", Price: 100}
+	db.Save(&p)
+	if !reflect.DeepEqual(p.GetCallTimes(), []int64{1, 1, 0, 1, 1, 0}) {
+		t.Errorf("Some errors happened when run create callbacks, %v", p.GetCallTimes())
+	}
+
+	db.Where("Code = ?", "unique_code").First(&p)
+	if !reflect.DeepEqual(p.GetCallTimes(), []int64{1, 1, 0, 0, 0, 0}) {
+		t.Errorf("Should be able to query about saved values in before filters, %v", p.GetCallTimes())
+	}
+
+	p.Price = 200
+	db.Save(&p)
+	if !reflect.DeepEqual(p.GetCallTimes(), []int64{1, 2, 1, 0, 1, 1}) {
+		t.Errorf("Some errors happened when run update callbacks, %v", p.GetCallTimes())
+	}
+
+	db.Where("Code = ?", "unique_code").First(&p)
+	if !reflect.DeepEqual(p.GetCallTimes(), []int64{1, 2, 1, 0, 0, 0}) {
+		t.Errorf("Some errors happened when run update callbacks, %v", p.GetCallTimes())
+	}
+}

sql.go

@@ -131,7 +131,7 @@ func (s *Orm) create(value interface{}) {
 	var id int64
 	s.err(s.model.callMethod("BeforeCreate"))
 	s.err(s.model.callMethod("BeforeSave"))
-
+	s.explain(value, "Create")
 	if s.driver == "postgres" {
 		s.err(s.db.QueryRow(s.Sql, s.SqlVars...).Scan(&id))
 	} else {
@@ -141,12 +141,11 @@ func (s *Orm) create(value interface{}) {
 		id, err = s.SqlResult.LastInsertId()
 		s.err(err)
 	}
+	result := reflect.ValueOf(s.model.Data).Elem()
+	result.FieldByName(s.model.PrimaryKey()).SetInt(id)
 
 	s.err(s.model.callMethod("AfterCreate"))
 	s.err(s.model.callMethod("AfterSave"))
-
-	result := reflect.ValueOf(s.model.Data).Elem()
-	result.FieldByName(s.model.PrimaryKey()).SetInt(id)
 }
 
 func (s *Orm) updateSql(value interface{}) {
@@ -169,7 +168,7 @@ func (s *Orm) updateSql(value interface{}) {
 func (s *Orm) update(value interface{}) {
 	s.err(s.model.callMethod("BeforeUpdate"))
 	s.err(s.model.callMethod("BeforeSave"))
-	s.Exec()
+	s.explain(value, "Update").Exec()
 	s.err(s.model.callMethod("AfterUpdate"))
 	s.err(s.model.callMethod("AfterSave"))
 	return