function st_distancespheroid(geometry, geometry) does not exist - postgresql

Question

I have installed postgis, I still have problem:
function st_distancespheroid(geometry, geometry) does not exist
WITH data AS (
SELECT a.*,
CAST(ST_DistanceSpheroid(geometry(location), st_geomfromtext('POINT(' || $7::decimal || ' ' || $8::decimal || ')', 4326))as numeric) / 1000 AS distance
FROM agent AS a
WHERE (a.agent_code ILIKE $1
OR a.name ILIKE $1
OR a.phone LIKE $1)
AND
a.sub_district_name LIKE ANY(string_to_array($4, ','))
AND
a.agent_status_id LIKE ANY(string_to_array($5, ','))
AND CASE WHEN $6 = 'FAVORITE' THEN
a.is_subscription = true
WHEN $6 = 'REGULER' THEN
a.is_subscription != true
ELSE
a.location LIKE '%%'
END
ORDER BY distance ASC
),
data_counter AS (
SELECT COUNT(agent_id) AS __total__
FROM data
)
SELECT *
FROM data, data_counter
LIMIT $2
OFFSET $3
`
when I run my go repo

Answer 1

How to install PostGIS
After installation you have to create the extension in the database. For instance, to install PostGIS 3.0 in a Debian distribution running PostgreSQL 13:
apt-get install postgresql-13-postgis-3
After that you create the extension in the database
CREATE EXTENSION postgis;
Now you'll be able to use the spatial functions.
How to calculate distances over a spheroid / sphere
The function ST_DistanceSpheroid expects three parameters, namely two geometries and the shperoid. In your code you're calling the function using only two geometries, hence the error function st_distancespheroid(geometry, geometry) does not exist. This is how it should be called (adapt it to the spheroid of your choice):
SELECT
ST_DistanceSpheroid(geom1,geom2,'SPHEROID["WGS 84",6378137,298.257223563]')
FROM t;
You can also tell ST_Distance to compute the distances using the spheroid if you cast the geometry parameters to geography:
SELECT ST_Distance(geom1::geography,geom2::geography,true) FROM t;
Another option - less accurate - is to use ST_DistanceSphere:
SELECT ST_DistanceSphere(geom1,geom2) FROM t;