Update field in array of objects in json postgres - postgresql

Question

I have postgres database with next json in my table
{"jobTitle":"Technical Writer","distance":60,"skills":[{"name":"Bootstrap (Front-End Framework)","isPrimary":true,"type":""}, {"name":"Javascript","isPrimary":false,"type":""}]}
I need to update field "skills" depends on "isPrimary" value in each item there. If "isPrimary" false, update to 1, otherwise to 5.
I have next query
UPDATE t
SET body = jsonb_set(body::jsonb, '{skills}', s.skills_updated::jsonb)
FROM (
SELECT
jsonb_agg(
jsonb_set(skills::jsonb, '{isPrimary}',
CASE
WHEN skills ->> 'isPrimary' = 'true' THEN '5'::jsonb
ELSE '1'::jsonb
END
)
) as skills_updated
FROM t,
json_array_elements(body -> 'skills') as skills
) s;
This query working incorrectly - it's accumulating all skills across all records in table and then setting this whole array in each record. this is my fiddle https://dbfiddle.uk/m28W7tPy
For instance, if I have next three records:
{"jobTitle":"Writer","distance":60, "skills": [{ "isPrimary": "true", "name": "Node.js" },{ "isPrimary": "false", "name": "Python" },{ "isPrimary": "false", "name": "Javascript" }]}
{"jobTitle":"Writer","distance":60, "skills": [{ "isPrimary": "true", "name": "Mysql" },{ "isPrimary": "false", "name": "Nest.js" }]}
{"jobTitle":"Writer","distance":60, "skills": [{ "isPrimary": "true", "name": "Postgres" },{ "isPrimary": "false", "name": "Typescript" }]}
I want to update just "isPrimary" for all above records and get in result next
{"jobTitle":"Writer","distance":60, "skills": [{ "isPrimary": 5, "name": "Node.js" },{ "isPrimary": 1, "name": "Python" },{ "isPrimary": 1, "name": "Javascript" }]}
{"jobTitle":"Writer","distance":60, "skills": [{ "isPrimary": 5, "name": "Mysql" },{ "isPrimary": 1, "name": "Nest.js" }]}
{"jobTitle":"Writer","distance":60, "skills": [{ "isPrimary": 5, "name": "Postgres" },{ "isPrimary": 1, "name": "Typescript" }]}
when I'm getting after running my query
{"jobTitle":"Writer","distance":60, "skills": [{ "isPrimary": 5, "name": "Node.js" },{ "isPrimary": 1, "name": "Python" },{ "isPrimary": 1, "name": "Javascript" }, { "isPrimary": 5, "name": "Mysql" },{ "isPrimary": 1, "name": "Nest.js" }, { "isPrimary": 5, "name": "Postgres" },{ "isPrimary": 1, "name": "Typescript" }]}
{"jobTitle":"Writer","distance":60, "skills": [{ "isPrimary": 5, "name": "Node.js" },{ "isPrimary": 1, "name": "Python" },{ "isPrimary": 1, "name": "Javascript" }, { "isPrimary": 5, "name": "Mysql" },{ "isPrimary": 1, "name": "Nest.js" }, { "isPrimary": 5, "name": "Postgres" },{ "isPrimary": 1, "name": "Typescript" }]}
{"jobTitle":"Writer","distance":60, "skills": [{ "isPrimary": 5, "name": "Node.js" },{ "isPrimary": 1, "name": "Python" },{ "isPrimary": 1, "name": "Javascript" }, { "isPrimary": 5, "name": "Mysql" },{ "isPrimary": 1, "name": "Nest.js" }, { "isPrimary": 5, "name": "Postgres" },{ "isPrimary": 1, "name": "Typescript" }]}
Can anyone help?

Answer 1

The issue with your query is that you're not keeping trace of each "id" value, nor you're matching it inside the update statement. Adding the "id" selection inside the subquery, and the final WHERE condition to the UPDATE statement, can solve your problem.
UPDATE t
SET body = jsonb_set(body::jsonb, '{skills}', s.skills_updated::jsonb)
FROM (
SELECT id,
jsonb_agg(
jsonb_set(skills::jsonb, '{isPrimary}',
CASE
WHEN skills ->> 'isPrimary' = 'true' THEN '5'::jsonb
ELSE '1'::jsonb
END
)
) as skills_updated
FROM t,
json_array_elements(body -> 'skills') as skills
GROUP BY id
) s
WHERE t.id = s.id ;
Check the demo here.