accesing hasura session from custom function fails

I tried to follow the steps to create a custom function and access the hasura session variables from here and there are 2 issues

1- if you track the function from the console, when you execute the query it complains about not having the arguments variable

2- in order to get the session variables, I tracked the function through the API and then I get this error

{
  "errors": [
    {
      "extensions": {
        "internal": {
          "statement": "WITH \"public_get_session_role__result\" AS (SELECT  *  FROM \"public\".\"get_session_role\"()       ) SELECT  coalesce(json_agg(\"root\" ), '[]' ) AS \"root\" FROM  (SELECT  row_to_json((SELECT  \"_1_e\"  FROM  (SELECT  \"_0_root.base\".\"result\" AS \"result\"       ) AS \"_1_e\"      ) ) AS \"root\" FROM  (SELECT  *  FROM \"public_get_session_role__result\" WHERE ('true')     ) AS \"_0_root.base\"      ) AS \"_2_root\"      ",
          "prepared": true,
          "error": {
            "exec_status": "FatalError",
            "hint": "No function matches the given name and argument types. You might need to add explicit type casts.",
            "message": "function public.get_session_role() does not exist",
            "status_code": "42883",
            "description": null
          },
          "arguments": [
            "(Oid 114,Just (\"{\\\"x-hasura-role\\\":\\\"admin\\\",\\\"x-hasura-user-id\\\":\\\"15169bf8-294a-49cb-9d48-13a39a8c016e\\\"}\",Binary))"
          ]
        },
        "path": "$",
        "code": "unexpected"
      },
      "message": "postgres query error"
    }
  ]
}

I’m using hasura v1.0.0

[gunar]

I was able to reproduce here too.

@tafelito fyi looking at the PR I realized a quick fix for the meantime. Just add a second argument to your function and to your queries.

CREATE OR REPLACE FUNCTION public.me(
  hasura_session json
+  , dummyarg text
) RETURNS SETOF "user" LANGUAGE sql STABLE AS $ function $
SELECT * FROM "user" WHERE   id = (hasura_session ->> 'x-hasura-user-id') :: uuid $ function $

{
  me(args: {dummyarg: ""}) {
    id
  }
}

@rakeshkky, getting information about the user currently logged in seems common enough that you might want to add this specific use-case to Hasura’s documentation.

@rakeshkky, also, would love to have the v2 of the track_function function available through the console/GUI—although this is probably already on your radar.

Thanks a bunch.

[greatwitenorth]

Yes the function was tracked via console. Here’s my schema and function definition I’m currently using:

CREATE
OR REPLACE FUNCTION public.players_nearby_me(
  hasura_session json,
  distance_kms integer DEFAULT 50
) RETURNS SETOF users LANGUAGE sql STABLE AS $ function $
SELECT
  *
FROM
  users
WHERE
  id NOT IN ((hasura_session ->> 'x-hasura-user-id') :: int)
  AND ST_DistanceSphere (
    users."location",
    (
      SELECT
        u."location"
      FROM
        users as u
      WHERE
        id = (hasura_session ->> 'x-hasura-user-id') :: int
    )
  ) < distance_kms * 1000;$ function $

users table:

-- Sequence and defined type
CREATE SEQUENCE IF NOT EXISTS users_id_seq;

-- Table Definition
CREATE TABLE "public"."users" (
    "id" int8 NOT NULL DEFAULT nextval('users_id_seq'::regclass),
    "name" varchar(255) NOT NULL,
    "email" varchar(255) NOT NULL,
    "email_verified_at" timestamp(0),
    "password" varchar(255) NOT NULL,
    "remember_token" varchar(100),
    "created_at" timestamp(0),
    "updated_at" timestamp(0),
    "location" geometry,
    PRIMARY KEY ("id")
);

Let me know if you need anything else.