Update of value in array of jsonb returns error"invalid input syntax for type json" - sql

Question

I have a column of type jsonb which contains json arrays of the form
[
{
"Id": 62497,
"Text": "BlaBla"
}
]
I'd like to update the Id to the value of a column word_id (type uuid) from a different table word.
I tried this
update inflection_copy
SET inflectionlinks = s.json_array
FROM (
SELECT jsonb_agg(
CASE
WHEN elems->>'Id' = (
SELECT word_copy.id::text
from word_copy
where word_copy.id::text = elems->>'Id'
) THEN jsonb_set(
elems,
'{Id}'::text [],
(
SELECT jsonb(word_copy.word_id::text)
from word_copy
where word_copy.id::text = elems->>'Id'
)
)
ELSE elems
END
) as json_array
FROM inflection_copy,
jsonb_array_elements(inflectionlinks) elems
) s;
Until now I always get the following error:
invalid input syntax for type json
DETAIL: Token "c66a4353" is invalid.
CONTEXT: JSON data, line 1: c66a4353...
The c66a4535 is part of one of the uuids of the word table. I don't understand why this is marked as invalid input.
EDIT:
To give an example of one of the uuids:
select to_jsonb(word_id::text) from word_copy limit(5);
returns
+----------------------------------------+
| to_jsonb |
|----------------------------------------|
| "078c979d-e479-4fce-b27c-d14087f467c2" |
| "ef288256-1599-4f0f-a932-aad85d666c9a" |
| "d1d95b60-623e-47cf-b770-de46b01042c5" |
| "f97464c6-b872-4be8-9d9d-83c0102fb26a" |
| "9bb19719-e014-4286-a2d1-4c0cf7f089fc" |
+----------------------------------------+
As requested the respective columns id and word_id from the word table:
+---------------------------------------------------+
| row |
|---------------------------------------------------|
| ('27733', '078c979d-e479-4fce-b27c-d14087f467c2') |
| ('72337', 'ef288256-1599-4f0f-a932-aad85d666c9a') |
| ('72340', 'd1d95b60-623e-47cf-b770-de46b01042c5') |
| ('27741', 'f97464c6-b872-4be8-9d9d-83c0102fb26a') |
| ('72338', '9bb19719-e014-4286-a2d1-4c0cf7f089fc') |
+---------------------------------------------------+
+----------------+----------+----------------------------+
| Column | Type | Modifiers |
|----------------+----------+----------------------------|
| id | bigint | |
| value | text | |
| homonymnumber | smallint | |
| pronounciation | text | |
| audio | text | |
| level | integer | |
| alpha | bigint | |
| frequency | bigint | |
| hanja | text | |
| typeeng | text | |
| typekr | text | |
| word_id | uuid | default gen_random_uuid() |
+----------------+----------+----------------------------+

Answer 1

I would suggest you to modify your sub query as follow :
update inflection_copy AS ic
SET inflectionlinks = s.json_array
FROM
(SELECT jsonb_agg(CASE WHEN wc.word_id IS NULL THEN e.elems ELSE jsonb_set(e.elems, array['Id'], to_jsonb(wc.word_id::text)) END ORDER BY e.id ASC) AS json_array
FROM inflection_copy AS ic
CROSS JOIN LATERAL jsonb_path_query(ic.inflectionlinks, '$[*]') WITH ORDINALITY AS e(elems, id)
LEFT JOIN word_copy AS wc
ON wc.id::text = e.elems->>'Id'
) AS s
The LEFT JOIN clause will return wc.word_id = NULL when there is no wc.id which corresponds to e.elems->>'id', so that e.elems is unchanged in the CASE.
The ORDER BY clause in the aggregate function jsonb_agg will ensure that the order is unchanged in the jsonb array.
jsonb_path_query is used instead of jsonb_array_elements so that to not raise an error when ic.inflectionlinks is not a jsonb array and it is used in lax mode (which is the default behavior).
see the test result in dbfiddle