I need a jsonpath expression, which returns the first element of an array which has "key" property.
I'm looking for the same result as this query:
SELECT
j
FROM
jsonb_array_elements(
'[
{"key": "foo"},
{"other": "bar"},
{"key": "baz", "other": "blah"}
]'::JSONB
) j
WHERE
j ? 'key'
LIMIT 1
My query looks like this currently, but doesn't work
SELECT
jsonb_path_query(
'[
{"key": "foo"},
{"other": "bar"},
{"key": "baz", "other": "blah"}
]'::JSONB,
'$[?(@.key)] [0]')
Please see this: https://www.postgresql.org/docs/12/functions-json.html#FUNCTIONS-SQLJSON-PATH-OPERATORS
SELECT
jsonb_path_query_first(
'[
{"key": "foo"},
{"other": "bar"},
{"key": "baz", "other": "blah"}
]'::JSONB,
'$[*] ? (exists (@.key))')
;
jsonb_path_query_first
------------------------
{"key": "foo"}
(1 row)