How to get the ID of the conflicting row in upsert?

I have a table tag with 2 columns: id (uuid) and name (text). I now want to insert a new tag into the table, but if the tag already exists, I want to simply get the id of the existing record. I assumed I could just use ON CONFLICT DO NOTHING in combination with RETURNING "id": INSERT INTO "tag" ("name") VALUES( 'foo' ) ON CONFLICT DO NOTHING RETURNING "id"; But this returns an empty result set, if the tag with the name "foo" already exists. I then changed the query to use a noop DO UPDATE clause: INSERT INTO "tag" ("name") VALUES( 'foo' ) ON CONFLICT ("name") DO UPDATE SET "name" = 'foo' RETURNING "id"; This works as intended, but it is somewhat confusing, because I'm just setting the name to the already existing value. Is this the way to go about this problem or is there a simpler approach I'm missing?