MapStruct 如果源属性是 null 使用替代属性

Question

Is there a simple way to conditionally use a different source property if the first property is null? I am looking for something like this:

@Mapping(target = "myTargetProperty", source = "mySourceProperty", alternativeWhenNull = "myAltSourceProperty")

Answer 1

You can use defaultValue or defaultExpression to specify a value if the source property is null

For your specific use case you can use defaultExpression = "java(source.getAlternativeProperty())