Merging for arrays does mean concatenation (append for Collections),
and nothing else. This because while there are many possible ways
users might
want to handle merging of two sequence values, it is surprisingly
difficult to figure out declarative way that covers enough without
being very complicated.
So: instead of trying to figure out a complex solution that might not
cover all cases, I went with simple, predictable solution, which does
not cover all cases.
In future it could be possible to extend `@JsonMerge` to perhaps allow
custom handler of some sort that would allow custom logic, but this
does not yet exist.
-+ Tatu +-
On Fri, Oct 26, 2018 at 3:32 PM Dzmitry Sankouski
<eqwewqdasdsaczx...@gmail.com> wrote:
>
> I have two Jsons I want to merge. Arrays in json should be also merged, not
> concatenated.
>
> Example:
> Json 1:
> {
> "level1": {
> "value": "a",
> "anotherValue": "z",
> "array1": [
> {
> "value": "b",
> "anotherValue": "z"
> }
> ]
> }
> }
>
>
> Json 2:
> {
> "level1": {
> "value": "c",
> "array1": [
> {
> "value": "d"
> }
> ]
> }
> }
>
> After merge, I want to get:
> {
> "level1": {
> "value": "c",
> "anotherValue": "z",
> "array1": [
> {
> "value": "d",
> "anotherValue": "z"
> }
> ]
> }
> }
>
>
> Using code from this suggestion about json merge, I got array1 not merged,
> but concatenated:
> {
> "level1": {
> "value": "c",
> "anotherValue": "z",
> "array1": [
> {
> "value": "b",
> "anotherValue": "z"
> },
> {
> "value": "d",
> "anotherValue": "z"
> }
> ]
> }
> }
>
>
> How do I achieve arrays in json being merged, not concatenated?
>
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