Blockchain Development with Hyperledger

Creating a new transaction

For the purpose of our tests, we will keep the new transaction relatively simple: our transaction will merge two assets into one, adding their value in the process.

To declare the new transaction, we will edit the model file and add this new declaration:

transaction MergeAssets {--> Asset mergeFrom--> Asset mergeTo}

With the definition created, let's add the logic in the /lib/logic.js file:

/**  * Sample transaction  * @param {org.example.biznet.MergeAssets} tx  * @transaction  */function onMergeAssets(tx) {  var assetRegistry;  var mergeFromAsset = tx.mergeFrom;  var mergeToAsset = tx.mergeTo;  mergeToAsset.value += tx.mergeFrom.value;  return getAssetRegistry('org.example.biznet.SampleAsset')    .then(function(ar) { assetRegistry ...