On Wed, Dec 14, 2022 at 5:35 PM Senthil Nathan <senthil...@gmail.com> wrote:
>
> Hi,
>
> Rather updating all the properties, I want to update the values for only null
> fields using readerForUpdating.
>
> Class:
> @Getter
> @Setter
> public class Record {
> public String source;
> public String resource;
> }
>
> Record record = new Record();
> record.setSource("sourceFromObject");
> record.setResource(null);
>
> Json:
>
> String json = {"source": "sourceFromJson", "resource":"resourceFromJson"}
>
> When I do,
> ObjectMapper objectMapper = new ObjectMapper();
> objectMapper.readerForUpdating(record).readValue(json);
>
> am getting the result as [Record: source = " sourceFromJson ", resource =
> "resourceFromJson" ] but
> I want the result to be [Record: source = "sourceFromObject", resource =
> "resourceFromJson" ]
>
> Could anyone please help on this.
That cannot be done with Records in general: Records are immutable so
`readerForUpdating()` won't be able to use setters (although might try
to force changes via fields).
Otherwise I would suggest overriding `setSource(...)` and other
methods to implement logic you want: you could assign only if there is
no non-null value.
But that won't really work with Records: a new instance will be
created from just the data passed.
-+ Tatu +-
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