Create a json object using array of json objects - json

Question

In postgres Say I have schema as such:
table item {
type varchar(40)
entity_id bigint
entity_type varchar(40)
user_id bigint
}
And I want to query the table to get the info like this:
{
"typeA": {
"count": 3,
"me": true
},
"typeC": {
"count": 3,
"me": false
},
"typeE": {
"count": 3,
"me": false
},
"typeR": {
"count": 3,
"me": true
}
}
From a query where the main data is this:
SELECT ARRAY_AGG(x)
FROM
(
SELECT type,
count(*),
(CASE
WHEN (SELECT id
FROM items as i
WHERE i.entity_type = 'sometype'
AND i.entity_id = 234
AND i.user_id = 32
AND i.type = items.type) is not null
THEN true
ELSE false
END) AS me
FROM items
WHERE items.entity_type = 'sometype'
AND items.entity_id = 234
GROUP BY type
) as x
This returns an array of the info i need type count and me. But I need it formatted like above versus:
[
{
"type": "typeA",
"count": 3,
"me": true
},
{
"type": "typeC",
"count": 3,
"me": false
},
{
"type": "typeE",
"count": 3,
"me": false
},
{
"type": "typeR",
"count": 3,
"me": true
}
]
Which is the current way it is formatted. Have been unable to find a way to build the json object I need. I was able to get three json objects that are like that But I need the three nested in one object.

Answer 1

Not exactly what you want, but from PostgreSQL - Aggregate Functions, I would guess, you can try json_object_agg(name, value), e.g.
SELECT JSON_OBJECT_AGG(type, x)
FROM
(
SELECT type,
count(*),
(CASE
WHEN (SELECT id
FROM items as i
WHERE i.entity_type = 'sometype'
AND i.entity_id = 234
AND i.user_id = 32
AND i.type = items.type) is not null
THEN true
ELSE false
END) AS me
FROM items
WHERE items.entity_type = 'sometype'
AND items.entity_id = 234
GROUP BY type, me
) as x