Hyperledger Composer How to update a contract after it is saved

Question

I have a saved contract and now I want to update it. I tried:

document.contract.totalSigners = 3;

return getAssetRegistry(NS + '.Document')
  .then(function (documentRegistry) {
    return documentRegistry.update(document);
  });

But it didnt work. My architecture is as follows:

participant Owner extends Business { 
}

asset Contract identified by contractId {
  o String contractId
  --> Owner owner
}

asset Document identified by documentId {
  o String documentId
  o DocumentStatus status
  --> Contract contract
}

Answer 1

Try this and see if this works:

/**
* Track the trade of a commodity from one trader to another 
* @param {org.acme.trading.Trade} trade - the trade to be processed
* @transaction
*/
async function tradeCommodity(trade) { // eslint-disable-line no-unused-vars

// set the new owner of the commodity
trade.commodity.owner = trade.newOwner;
const assetRegistry = await getAssetRegistry('org.acme.trading.Commodity');

// persist the state of the commodity
await assetRegistry.update(trade.commodity);
}