I'm working on my first Symfony project with Doctrine, and I've run into a hitch. I'm trying to express a game with two players. The relationship I want to have is PlayerOne and PlayerTwo each being keyed to an ID in the Users table. This is part of what I've got so far:

Game:
  actAs: { Timestampable:- }
  columns:
    id: { type: integer,  notnull: true, unique: true }
    startDate: { type: timestamp, notnull: true }
    playerOne: { type: integer, notnull: true }
    playerTwo: { type: integer, notnull: true }
    winner: { type: integer, notnull:true, default:0 }
  relations:
    User: { onUpdate: cascade, local: playerOne, foreign: id}
    User: { onUpdate: cascade, local: playerTwo, foreign: id}

That doesn't work. It builds fine, but the SQL it generates only includes a constraint for playerTwo. I've tried a few other things:

User: { onUpdate: cascade, local: [playerOne, playerTwo], foreign: id}

Also:

    User: [{ onUpdate: cascade, local: playerOne, foreign: id}, { onUpdate: cascade, local: playerTwo, foreign: id}]

Those last two throw errors when I try to build. Is there anyone out there who understands what I'm trying to do and can help me achieve it?