创建新参与者并通过引用它添加资产数组

Question

我在尝试将新资产添加到资产数组时遇到问题，这些资产是参与者的一部分，作为参考 .

这里我有 SharedAccount 参与者，由其成员控制，这些成员通过他们在帐户中的份额连接。我想写一个交易来由一个人创建一个新的 SharedAccount。当一个人提交交易时，如果那个人应该创建一个共享资产并将其添加到 SharedAccount 的 shares 数组中。

这是我的代码的样子

.cto:

...
participant SharedAccount identified by sharedAccountId {
  o String sharedAccountId
  --> Share[] shares
  o Double balance
  o Double originalBalance
}

asset Share identified by shareId {
  o String shareId
  --> Person shareHolder
  o Double amount
}

transaction CreateSharedAccount {
  --> Person creator
  o String accountName
  o Integer amount
}
...

.js:

...
/**
 * @param {org.mistral.bulliongrower.CreateSharedAccount} createSharedAccount
 * @transaction
 */
async function CreateSharedAccount(createSharedAccount) {

  const factory = getFactory();
  const NS = 'org.mistral.bulliongrower';

  // create share

  const share = factory.newResource(NS, 'Share', createSharedAccount.creator.personId + 'SHARE');
  share.amount = createSharedAccount.amount;
  share.shareHolder = createSharedAccount.creator;
  share.shareHolder.balance -= createSharedAccount.amount;

  const sharesRegistry = await getAssetRegistry(NS + '.Share');
  await sharesRegistry.add(share);

  const personRegistry = await getParticipantRegistry(NS + '.Person');
  await personRegistry.update(share.shareHolder);

  // create sharedAccount

  const sharedAcc = factory.newResource(NS, 'SharedAccount', createSharedAccount.accountName);
  sharedAcc.shares.push(share);
  sharedAcc.balance = createSharedAccount.amount;
  sharedAcc.originalBalance = createSharedAccount.amount;

  const sharedAccRegistry = await getAssetRegistry(NS + '.SharedAccount');
  await sharedAccRegistry.add(sharedAcc);

}
...

我不确定在将共享资产添加到 SharedAccount 时是否应该使用 factory.newRelationship 以及如何使用。我在操场上尝试执行交易时遇到的错误是

TypeError: Cannot read property 'push' of undefined

Answer 1

您的交易代码应该如下所示 - 您的一些参考资料不正确（指出所有更改花费的时间太长，因此您可以在下面参考）。

我添加了一个测试字符串（针对 'Person'）只是为了展示您将要做什么（以便有理由更新该特定参与者注册表）。

在我看来 SharedAccount 是一种资产而不是参与者。您将使用适当的 JS API 来更新该类型的注册表。

balance 不是 Person 上的字段（它在 SharedAccount 上），但您的代码试图引用它。

我已经为 'alternative ways' 的声明等留下评论 - 仅供参考。

/**
 * @param {org.mistral.bulliongrower.CreateSharedAccount} createSharedAccount
 * @transaction
 */
async function CreateSharedAccount(createSharedAccount) {

  const factory = getFactory();
  const NS = 'org.example.trading';

  // create share

  const share = factory.newResource(NS, 'Share', createSharedAccount.creator.personId + 'SHARE');
  share.amount = createSharedAccount.amount;
  console.log("amount is " + share.amount);
  share.shareHolder = createSharedAccount.creator;
 // share.shareHolder.balance -= createSharedAccount.amount;  // won't work - balance is a field on SharedAccount not Person - moved it below


  const sharesRegistry = await getAssetRegistry(NS + '.Share');
  await sharesRegistry.add(share);

  share.shareHolder.newstr = "123"; // setting 'SOME' field (I added 'newstr' in my model, see below - so as to have a reason to update / give an example
  const personRegistry = await getParticipantRegistry(NS + '.Person');
  await personRegistry.update(share.shareHolder);

  // create sharedAccount

  const sharedAcc = factory.newResource(NS, 'SharedAccount', createSharedAccount.accountName);

  //let idsArray = new Array(); // alternative, or use implicit below.
  let idsArray = [] ;
  let shareAssetRelationship = factory.newRelationship(NS, 'Share', share.getIdentifier());
  idsArray.push(shareAssetRelationship); // only one element anyway

  sharedAcc.shares = idsArray;
  sharedAcc.balance = createSharedAccount.amount; // this is a new resource - so balance is eq to trxn amount ?
  sharedAcc.originalBalance = createSharedAccount.amount; // original balance is nothing or 'balance' ?....anyway....

  const sharedAccRegistry = await getAssetRegistry(NS + '.SharedAccount');
  await sharedAccRegistry.add(sharedAcc);

}

我用的模型是这样的：

participant Person identified by personId {
  o String personId
  o String newstr
}

asset SharedAccount identified by sharedAccountId {
  o String sharedAccountId
  --> Share[] shares
  o Double balance
  o Double originalBalance
}

asset Share identified by shareId {
  o String shareId
  --> Person shareHolder
  o Double amount
}

transaction CreateSharedAccount {
  --> Person creator
  o String accountName
  o Integer amount
}

Answer 2

尝试这样做：

/**
* @param {org.mistral.bulliongrower.CreateSharedAccount} createSharedAccount
* @transaction
*/
async function CreateSharedAccount(createSharedAccount) {

const factory = getFactory();
const NS = 'org.mistral.bulliongrower';

// create share

const share = factory.newResource(NS, 'Share', createSharedAccount.creator.personId + 'SHARE');
//const share = factory.newRelationship(NS, 'Share', createSharedAccount.creator.personId + 'SHARE');
share.amount = createSharedAccount.amount;
//share.shareHolder = factory.newRelationship(NS, 'Share', createSharedAccount.creator.personId);
share.shareHolder = createSharedAccount.creator;
share.shareHolder.balance -= createSharedAccount.amount;


const sharesRegistry = await getAssetRegistry(NS + '.Share');
await sharesRegistry.add(share);

const personRegistry = await getParticipantRegistry(NS + '.Person');
await personRegistry.update(share.shareHolder);

// create sharedacc

const sharedAcc = factory.newResource(NS, 'SharedAccount', createSharedAccount.accountName);
//sharedAcc.shares = factory.newRelationship(NS, 'Share', createSharedAccount.creator.personId);
//sharedAcc.shares[0] = factory.newRelationship(NS, 'Share', share.shareId);

// define an array  
let  sharesArray = [];
sharesArray.push(share);

sharedAcc.shares = sharesArray;
sharedAcc.balance = createSharedAccount.amount;
sharedAcc.originalBalance = createSharedAccount.amount;

// use getParticipantRegistry not getAssetRegistry
const sharedAccRegistry = await getParticipantRegistry(NS + '.SharedAccount');
await sharedAccRegistry.add(sharedAcc);

}

创建新参与者并通过引用它添加资产数组

Creating new participant and adding array of assets by reference to it

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