Add generic dbo.Null

Author: christianezeani

dbo/null.go

@@ -14,16 +14,22 @@ type Null[T comparable] struct {
 }
 
 func (n *Null[T]) Scan(value any) (err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			err = errors.From(r)
+		}
+	}()
+
 	xType := reflect.TypeOf(n.Data)
 
 	xValue := reflect.ValueOf(value)
 	xValueType := xValue.Type()
 
-	if !xValueType.AssignableTo(xType) {
+	if !xValueType.AssignableTo(xType) && !xValueType.ConvertibleTo(xType) {
 		return errors.New("Invalid value")
 	}
 
-	n.Data = xValue.Interface().(T)
+	n.Data = xValue.Convert(xType).Interface().(T)
 	n.Valid = !xValue.IsZero()
 
 	return

tests/dbo_test.go

@@ -121,12 +121,12 @@ func (s *DBOTestSuite) TestNullString() {
 func (s *DBOTestSuite) TestNullUint() {
 	var data dbo.Null[uint]
 
-	data.Scan(uint(200))
+	data.Scan(200)
 
 	assert.Equal(s.T(), data.Data, uint(200))
 	assert.True(s.T(), data.Valid)
 
-	data.Scan(uint(0))
+	data.Scan(0)
 
 	assert.Equal(s.T(), data.Data, uint(0))
 	assert.False(s.T(), data.Valid)