Add includeNil requiredField when custom struct field IsZero in Update method. Add test

internal/statements/update.go

@@ -126,7 +126,7 @@ func (statement *Statement) BuildUpdates(tableValue reflect.Value,
 
 		if fieldValue.CanAddr() {
 			if structConvert, ok := fieldValue.Addr().Interface().(convert.Conversion); ok {
-				if utils.IsZero(fieldValue.Interface()) {
+				if !includeNil && !requiredField && utils.IsZero(fieldValue.Interface()) {
 					continue
 				}
 				data, err := structConvert.ToDB()

tests/types_test.go

@@ -633,6 +633,9 @@ func (d *ZDecimal) FromDB(data []byte) error {
 }
 
 func (d ZDecimal) ToDB() ([]byte, error) {
+	if d.value == nil {
+		return []byte("0"), nil
+	}
 	return []byte(fmt.Sprintf("%d", (d.value).Int64())), nil
 }
 
@@ -688,6 +691,23 @@ func TestZDecimal(t *testing.T) {
 	assert.NoError(t, err)
 	assert.True(t, has)
 	assert.Equal(t, "test2", "test2")
-	assert.False(t, m.Amount.IsZero())
+	assert.False(t, m2.Amount.IsZero())
-	assert.Equal(t, "10000000000000000", m.Amount.String())
+	assert.Equal(t, "10000000000000000", m2.Amount.String())
+
+	_, err = testEngine.AllCols().Update(&ZMyMoney{
+		Id:      1,
+		Account: "test3",
+	})
+	assert.NoError(t, err)
+
+	var m3 = ZMyMoney{
+		Id: 1,
+	}
+	has, err = testEngine.Get(&m3)
+
+	assert.NoError(t, err)
+	assert.True(t, has)
+	assert.Equal(t, "test3", "test3")
+	assert.True(t, m3.Amount.IsZero())
+	assert.Equal(t, "0", m3.Amount.String())
 }