ILIKE query inside arrays of objects in jsonb column

Question

I have a jsonb data column made up of various objects. Here is an example.

{"LicensePlates": {"Type": "LicensePlateList", "Value": ["XXXXX"]}, "SubscriptionInfo": {"Type": "SubscriptionInfoList", "Value": [{"id": "1", "lastname": "rossi", "firstname": "paola"}, {"id": "2", "lastname": "Scicolone", "firstname": "Paolo"}]}}

Now I'm searching a specific info in SubscriptionInfo key like this:

SELECT * FROM column WHERE (data -> 'SubscriptionInfo') -> 'Value' @> '[{"firstname": "Paolo"}]';

It works fine, but I would also like to search for "partial" information, eg. searching for the string "pa" (using ILIKE or anything else similar) should return the entire record. it's possible?

Answer 1

You have two options ( demo )

1. convert data to lower case

select * 
from 
  test 
where 
  lower(data -> 'SubscriptionInfo' ->> 'Value')::jsonb @> lower('[{"firstname": "paolo"}]')::jsonb;

2. Use cross join and extract JSON then use ilike

select distinct on (t.id) t.*
from 
  test t
  cross join jsonb_array_elements(data -> 'SubscriptionInfo' -> 'Value') ej
where
  value ->> 'firstname' ilike '%paolo%';

Answer 2

If you are using Postgres 13 or later, you can use a SQL/JSON path expression:

select t.*
from the_table t
where t.data @@ '$.SubscriptionInfo.Value[*].firstname like_regex "paolo" flag "i"'