On 03/30/2015 10:54 AM, Deven Phillips wrote:
Hi all,
I have a query which selects several rows of data, and contained in
one of those rows is some aggregated JSON data. I am using row_to_json()
to make the whole output JSON and I am providing "true" for pretty
formatting of the JSON. The problem that I am seeing is that they nested
JSON block is not being prettified along with the outer JSON.
Example:
I have a function which takes a single key param and returns a JSON array:
CREATE OR REPLACE FUNCTION get_virtual_interfaces(vm_id BIGINT) RETURNS
jsonb AS $$
DECLARE
res jsonb;
BEGIN
SELECT array_to_json(array_agg(row_to_json(i, true)), true)
FROM (
SELECT DISTINCT * FROM virtual_interfaces WHERE vmid=vm_id)
i INTO res;
RETURN res;
END;
$$ LANGUAGE PLPGSQL;
That function is then used in another query to provide a nested JSON
containing the array:
SELECT
row.snt_code AS "snt_code",
row.vdc AS "vdc",
row.uuid AS "uuid",
row_to_json(row, true) AS "json"
FROM (
SELECT
vm.*,
CONCAT('https://int.cloudcontrol.sgns.net/v3/customer/',
vm.snt_code, '/vdc/', vm.vdc, '/vm/', vm.uuid) AS "self",
'cc.v3.sungardas.vm' AS "type",
(get_virtual_interfaces(vm.vmid)) as interfaces
FROM virtual_machines vm
) row;
The outer level of JSON is "pretty printed", but the content of the
array from the function is NOT, even though I have specified that it
should be. Any suggestions of how to address this?
Well it is documented:
http://www.postgresql.org/docs/9.4/interactive/functions-json.html
row_to_json(record [, pretty_bool]) Returns the row as a JSON object.
Line feeds will be added between level-1 elements if
^^^^^^^
pretty_bool is true.
I would say post a feature request on --hackers or at ask if work is
being done on this.
Thanks in advance!
Deven
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
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