Exclude "grouped" data from query - sql

Question

I have a table that looks like this (simplified):
CREATE TABLE IF NOT EXISTS records (
user_id uuid NOT NULL
ts timestamptz NOT NULL,
op_type text NOT NULL,
PRIMARY KEY (user_id, ts, op_type)
);
I cannot for practical purposes change the PRIMARY KEY.
I'm trying to write a query that gets all records for a given user_id where, for a specific record, the ts and the op_type don't match an array of exclusions.
I'm not exactly sure of the right postgres terminology so let me see if this example makes my constraint clearer:
This array looks something like this (in JavaScript):
var excludes = [
[DATE1, 'OP1'],
[DATE2, 'OP2']
]
If, for a given user id, there are rows that look like this in the database:
ts | op_type
----------------------------+-------------
DATE1 | OP1
DATE2 | OP2
DATE1 | OP3
DATE2 | OP1
OTHER DATE | OP1
OTHER DATE | OP2
Then, with the excludes from above, I'd like to run a query that returns everything EXCEPT or the first two rows since they match exactly.
My attempt was to do this:
client.query(`
SELECT * FROM records
WHERE
user_id = $1
AND (ts, op_type) NOT IN ($2)
`, [userId, excluding])
But I get "input of anonymous composite types is not implemented". I'm not sure how to properly type excluding or if this is even the right way to do this.

Answer 1

The query may look like this
SELECT *
FROM records
WHERE user_id = 'a0eebc999c0b4ef8bb6d6bb9bd380a11'
AND (ts, op_type) NOT IN (('2016-01-01', 'OP1'), ('2016-01-02', 'OP2'));
so if you want to pass the conditions as a single parameter then excluding should be a string in the format:
('2016-01-01', 'OP1'), ('2016-01-02', 'OP2')
It seems that there is no simple way to pass the condition string into query() as a parameter. You can try to write a function to get the string in the correct format (I'm not a JS developer but this piece of code seems to work well):
excluding = function(exc) {
var s = '(';
for (var i = 0; i < exc.length; i++)
s = s+ '(\''+ exc[i][0]+ '\',\''+ exc[i][1]+ '\'),';
return s.slice(0, -1)+ ')';
};
var excludes = [
['2016-01-01', 'OP1'],
['2016-01-02', 'OP2']
];
// ...
client.query(
'SELECT * FROM records '+
'WHERE user_id = $1 '+
'AND (ts, op_type) NOT IN ' + excluding(excludes),
[userId])