Nested search without keys in jsonb in PostgreSql - sql

Question

The question is about selection from JSON in PostgreSQL.
For example, application contains translation data in jsonb:
{
"en":{
"locale":"en",
"title":"Title",
"textShort":"Short text",
"textFull":"Full text"
}
"ru":{
"locale":"ru",
"title":"Заголовок",
"textShort":"Короткий текст",
"textFull":"Подробный текст"
}
}
This query works successfully:
select *
from content_records
where translations::json->'en'->>'title' like '%Title.';
But this query requires information about the locale, but the case is that we don't know anything about locales and search must be done for every locale, for example:
select *
from content_records
where translations::json->'any locale'->>'title' like '%Title.';
In MySQL it works as:
select *
from content_records
where LOWER(JSON_EXTRACT(translations, '$.*.title')) LIKE LOWER(:title);
There is the similar function in PostgreSQL:
json_extract_path, but it requires keywords and you can't miss the key as the symbol * does in MySQL.
The question is - how to do the selection of a nested JSON in this situation?

Answer 1

Unfortunately, in Postgres you have to "unnest" the keys first.
Something like this:
select t.*, cr.translations
from content_records cr
cross join lateral jsonb_object_keys(translations) as t(locale)
where lower(cr.translations -> t.locale ->> 'title') like '%title';
Note that if a title matches in more than one locale, you will get one row for each matching locale. If you don't want that, you can do the following:
select cr.*
from content_records cr
where exists (select *
from jsonb_object_keys(cr.translations) as t(locale)
where lower(cr.translations -> t.locale ->> 'title') like '%title')