Get the root key with jsonb_path_query() - sql

Question

In Postgres 13, for the below query, the jsonb values are getting filtered correctly based on "priority":
SELECT jsonb_path_query(
'{
"100": {
"name": "test",
"priority": 5
},
"101": {
"name": "test2",
"priority": 10
},
"102": {
"name": "test3",
"priority": 15
}
}'
, '$.* ? (#.priority > 10)')
Output:
{
"name": "test3",
"priority": 15
}
But I want to get the root key also. In this case I want to get the root for "test3" which is "102". To achieve this, I tried the below query:
SELECT jsonb_path_query(
'{
"100": {
"name": "test",
"priority": 5
},
"101": {
"name": "test2",
"priority": 10
},
"102": {
"name": "test3",
"priority": 15
}
}'
, '$ ? (#.*.priority > 10)')
But the output data is not getting filtered based on "priority".
Here is the output:
{
"100": {
"name": "test",
"priority": 5
},
"101": {
"name": "test2",
"priority": 10
},
"102": {
"name": "test3",
"priority": 15
}
}
The desired output would be:
{
"102": {
"name": "test3",
"priority": 15
}
}
How can I filter the data using an SQL/JSON path expression and the get the root key as well?

Answer 1

The task would be simple with a JSON array instead of a JSON object (which would seem like the more appropriate structure for your sample data):
SELECT jsonb_path_query(
'[
{
"100": {
"name": "test",
"priority": 5
}
},
{
"101": {
"name": "test2",
"priority": 10
}
},
{
"102": {
"name": "test3",
"priority": 15
}
}
]'
, '$[*] ? (#.*.priority > 10)');
While working with a JSON object, one way would be with the .keyvalue() method:
SELECT jsonb_path_query(
'{
"100": {
"name": "test",
"priority": 5
},
"101": {
"name": "test2",
"priority": 10
},
"102": {
"name": "test3",
"priority": 15
}
}'
, '$.keyvalue() ? (#.value.priority > 10)');
Returns:
{"id": 0, "key": "102", "value": {"name": "test3", "priority": 15}}
The manual:
object . keyvalue() → array
The object's key-value pairs, represented as an array of objects
containing three fields: "key", "value", and "id"; "id" is a
unique identifier of the object the key-value pair belongs to
To get your desired JSON value exactly:
SELECT jsonb_build_object(j->>'key', j->'value')
FROM (
SELECT jsonb_path_query(
'{
"100": {
"name": "test",
"priority": 5
},
"101": {
"name": "test2",
"priority": 10
},
"102": {
"name": "test3",
"priority": 15
}
}'
, '$.keyvalue() ? (#.value.priority > 10)')
) sub(j);
Returns:
{"102": {"name": "test3", "priority": 15}}
db<>fiddle here