Re: Can't register python class for domain?

Here's the class I want to register:

    class Milliamp(numbers.Real):

         def __init__(self, val):
            self.val = val

        @classmethod
        def adapt_from_pg(cls, value, cursor):

            log.debug("Inside adapt_from_pg and value is {0}.".format(value))

            if value is None:
                return

            else:
                return cls(value)

Here's how I try to register it:

    from dazzle.dazzletypes import Milliamp

    MILLIAMP = psycopg2.extensions.new_type(
        (milliamp_oid, ),
        "milliamp",
        Milliamp.adapt_from_pg)

    psycopg2.extensions.register_type(MILLIAMP)

I look up the milliamp OID by querying the pg_type table:

    > select typname, oid from pg_type where typname in ('float8', 'milliamp');
    typname   oid
    -------- ------
    float8      701
    milliamp 949531
    (2 rows)