PostgreSQL - return jsonb keys in one column - json

Question

I have the query to search for ids in jsonb column, the array can contain many id's.
Say I have data like this
id | act | act_id | from_ids | object_ids | post_date
2 post 1 {"2":"1494308197","3":"1494308198","4":"1494308199"} {"items":["104564"]} 1494308197
And a query like this
SELECT an.*
FROM activity_network an
WHERE an.from_ids ?| ARRAY['2','3'];
That query will return the row because it finds 2 and 3. But how can I return what it finds in it's own column. So that it returns 2,3 in text or json format or something like that in the results as well.
I tried this
SELECT an.*, jsonb_each_text(from_ids) b
FROM activity_network an
WHERE an.from_ids ?| ARRAY['2','3'];
But that creates 3 rows with a b column each one with the value 2, 3 and 4. I want 1 row with b column containing both 2 and 3 which is what I searched on.
Is that possible?
example result that I'm looking for. notice the last column. I put it as column delimited for demo purpose. it can be any format I can use.
2 | post | 1 | {"2":"1494308197","3":"1494308198","4":"1494308199} | {"items":["104564"]} | 1494308197 | 2,3}

Answer 1

here I explode/implode it. Quite ugly way.
t=# with p as (
with c as (
select '{"2":"1494308197","3":"1494308198","4":"1494308199"}'::json j
)
select json_object_keys(j),j->json_object_keys(j) v
from c
)
select concat('{',string_agg(concat('"',json_object_keys,'"',':',v)::text,','),'}')::json
from p
where json_object_keys::int = ANY (ARRAY [2,4]);
concat
-------------------------------------
{"2":"1494308197","4":"1494308199"}
(1 row)
Time: 0.348 ms

Answer 2

The function jsonb_exists_all sounds like what you want. It requires that all the elements in the array exist as top-level keys in the object.
You can find that and other undocumented functions for jsonb using the \df *jsonb* command in psql.
example paste:
test=# SELECT * from twj WHERE jsonb_exists_any(from_ids, ARRAY['2','3']);
id | act | from_ids
----+------+-----------------------------------------------------------
1 | post | {"2": "1494308197"}
3 | post | {"2": "1494308197", "3": "1494308198", "4": "1494308199"}
(2 rows)
test=# SELECT * from twj WHERE jsonb_exists_all(from_ids, ARRAY['2','3']);
id | act | from_ids
----+------+-----------------------------------------------------------
3 | post | {"2": "1494308197", "3": "1494308198", "4": "1494308199"}
(1 row)
The ?| operator you are using calls the jsonb_exists_any function.