On 08/17/2016 11:02 PM, Silk Parrot wrote:
Hi,
I am trying to model a social login application. The application can
support multiple login providers. I am thinking of creating a custom
type for each provider. e.g.
CREATE TYPE system.google_user AS (
email TEXT
);
CREATE TYPE system.facebook_user AS (
id TEXT
);
And having user table like:
CREATE TABLE user (
uuid UUID PRIMARY KEY DEFAULT public.uuid_generate_v4(),
google_user system.google_user,
facebook_user system.facebook_user,
UNIQUE (google_user.email)
);
However, the above create table query reports syntax error:
ERROR: syntax error at or near "."
LINE 10: UNIQUE (google_user.email)
Is there a way to create unique constraint on a field inside composite type?
I tried David's suggestion:
(google_user).email
and that did not work, but it got me to thinking, so:
CREATE OR REPLACE FUNCTION public.comp_type_idx(google_user)
RETURNS character varying
LANGUAGE sql
AS $function$ SELECT $1.email $function$
CREATE TABLE test_user (
google_user google_user,
facebook_user facebook_user
);
create unique index g_u on test_user (comp_type_idx(google_user));
test=# insert into test_user values (ROW('email'), ROW(1));
INSERT 0 1
test=# insert into test_user values (ROW('email'), ROW(1));
ERROR: duplicate key value violates unique constraint "g_u"
DETAIL: Key (comp_type_idx(google_user))=(email) already exists.
test=# insert into test_user values (ROW('email2'), ROW(1));
INSERT 0 1
test=# select * from test_user ;
google_user | facebook_user
-------------+---------------
(email) | (1)
(email2) | (1)
(2 rows)
--
Regards
Ryan
--
Adrian Klaver
adrian.kla...@aklaver.com
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