Can't sort by all array's items? - postgresql

Question

Postgresq 9.6
json
"availability": [
{
"qty": 25,
"price": 1599,
"is_available": true
},
{
"qty": 72,
"price": 3599,
},
"is_available": true
]
table with column data. Type is jsonb
If I want to sort first array's(availability) item by field "price" I this:
SELECT *
from product prod
WHERE to_tsvector('english', prod.data) ## to_tsquery('gram')
ORDER BY prod.data #> '{availability,0,price}' desc
OK.
But I need to sort all fields "price" in array availability
Smt like this (pseudo code)
SELECT *
from product prod
WHERE to_tsvector('english', prod.data) ## to_tsquery('gram')
ORDER BY prod.data #> '{availability,*,price}' desc
I need to to order by "price" desc.
The result must be
First record of result is second json
"availability": [
{
"qty": 25,
"price": 11599,
"is_available": true
},
{
"qty": 72,
"price": 13599,
},
"is_available": true
]
...
"availability": [
{
"qty": 25,
"price": 1599,
"is_available": true
},
{
"qty": 72,
"price": 3599,
},
"is_available": true
]
Is it possible?

Answer 1

This could be done like this:
select id,
jsonb_set(data, '{availability}',
(select jsonb_agg(item order by (item ->> 'price')::numeric)
from jsonb_array_elements(data -> 'availability') as x(item))
) as data
from product
where ...