Redeeming positions

Before redeeming your positions in the market is possible, the oracle must report the correct answer to the contract.

In the ConditionalTokensRepo.ts file it is defined the function that calls the contract to redeem the positions of the trader:

redeemPositions = async (
  collateralAddress: string,
  parentCollectionId: string,
  marketConditionId: string,
  indexSets: number[],
  from: string,
) => {
  return this.conditionalTokens.redeemPositions(
    collateralAddress,
    parentCollectionId,
    marketConditionId,
    indexSets,
    { from },
  )
}

The function redeemPositions is defined in the ConditionalTokens contract and it has two parameters:

function redeemPositions(IERC20 collateralToken, bytes32 parentCollectionId, bytes32 conditionId, uint[] calldata indexSets) external

• collateralToken: ERC20 token which exists on the same chain as the ConditionalTokens instance and is used as collateral to back positions.
• parentCollectionId: Collection ID of the parent outcome collection, or bytes32(0) if there's no parent.
• conditionId: It may be derived from other parameters via keccak256(abi.encodePacked(oracle, questionId, outcomeSlotCount)).
• indexSets: Is a bit array where the 0^th index corresponds with the 0^th outcome slot and also whether or not the 1^st place (1 << 0) is set in the value of indexSets. Similarly, the 1^st index corresponds with the 1^st outcome slot and is whether or not the 2^nd place (1 << 1) is set. It is supposed to represent a "union" of outcome slots. So like a value of 3 (0b11) would represent a position that pays out when either outcome slots [0] or [1] occur.

If the function succeeds, the following event will be emitted.

event PayoutRedemption(
  address indexed redeemer,
  IERC20 indexed collateralToken,
  bytes32 indexed parentCollectionId,
  bytes32 conditionId,
  uint[] indexSets,
  uint payout
);

The function to redeem positions is defined in Market.ts:

const redeem = async () => {
  const collateral = await marketMakersRepo.getCollateralToken()

  const indexSets = Array.from({ length: marketInfo.outcomes.length }, (v, i) =>
    i === 0 ? 1 : parseInt(Math.pow(10, i).toString(), 2),
  )

  const tx = await conditionalTokensRepo.redeemPositions(
    collateral.address,
    `0x${'0'.repeat(64)}`,
    marketInfo.conditionId,
    indexSets,
    account,
  )
}