From: Christophe Pettus <xof@thebuild.com>
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Subject: Overriding default adapters in psycopg
Message-Id: <FA57033D-66AE-42E9-8C5E-968CF69DB893@thebuild.com>
Date: Sun, 16 Nov 2025 08:56:07 -0800
To: psycopg@lists.postgresql.org
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Hi!

I am attempting to override the default adapters for JSON and JSONB in =
psycopg (3), but I am not quite sure how to go about it (I'm testing =
using orjson for serialization and deserialization).  This doesn't =
appear to work:

> class CyanJSONBLoader(Loader):
>     def load(self, data):
>         return orjson.loads(data)
>=20
> psycopg.adapters.register_loader("jsonb", CyanJSONBLoader)
>=20
> class CyanJSONBDumper(Dumper):
>     def dump(self, obj):
>         return orjson.dumps(obj)
>=20
> psycopg.adapters.register_dumper("jsonb", CyanJSONBDumper)
>=20

The calls work, but the dump/load functions are never called.

Thanks!=