t.Fatalf("failed to auto migrate, got error: %v", err)
	}

	for _, name := range []string{"author_id", "author_name", "author_email"} {
		if !DB.Migrator().HasColumn(&EngadgetPost{}, name) {
			t.Errorf("should has prefixed column %v", name)
		}
	}

	stmt := gorm.Statement{DB: DB}
	if err := stmt.Parse(&EngadgetPost{}); err != nil {
		t.Fatalf("failed to parse embedded struct")

	if err := DB.AutoMigrate(&CustomizeFieldStruct{}); err != nil {
		t.Errorf("Failed to migrate, got error: %v", err)
	}

	if DB.Migrator().HasColumn(&CustomizeFieldStruct{}, "FieldIgnore") {
		t.Errorf("FieldIgnore should not be created")
	}

	if DB.Migrator().HasColumn(&CustomizeFieldStruct{}, "field_ignore") {
		t.Errorf("FieldIgnore should not be created")
	}

	generateStruct := func(name string) *CustomizeFieldStruct {

	// MigrateColumnUnique migrate column's UNIQUE constraint, it's part of MigrateColumn.
	MigrateColumnUnique(dst interface{}, field *schema.Field, columnType ColumnType) error
	HasColumn(dst interface{}, field string) bool
	RenameColumn(dst interface{}, oldName, field string) error
	ColumnTypes(dst interface{}) ([]ColumnType, error)

	// Views
	CreateView(name string, option ViewOption) error

	}

	if !DB.Table("column_structs").Migrator().HasColumn(&NewColumnStruct{}, "NewName") {
		t.Fatalf("Failed to find added column")
	}

	if err := DB.Table("column_structs").Migrator().DropColumn(&NewColumnStruct{}, "NewName"); err != nil {
		t.Fatalf("Failed to add column, got %v", err)
	}

	if DB.Table("column_structs").Migrator().HasColumn(&NewColumnStruct{}, "NewName") {
		t.Fatalf("Found deleted column")
	}

				).Error

			}
		}
		return fmt.Errorf("failed to look up field with name: %s", field)
	})
}

// HasColumn check has column `field` for value or not
func (m Migrator) HasColumn(value interface{}, field string) bool {
	var count int64
	m.RunWithValue(value, func(stmt *gorm.Statement) error {
		currentDatabase := m.DB.Migrator().CurrentDatabase()
		name := field