为什么获取不到资产附属参与者的属性？

Question

我想更新资产。为此，我想检查是否只有创建它的用户（此处：发布医生）才能更新它。 问题：我可以得到"itemToUpdate.issueingPhysician"，但是"itemToUpdate.issueingPhysician.userId"是未定义的。

为了说明，我在我的代码中放入了一条错误消息（见下文）并在 Composer Playground 中测试了代码。它返回：

"Error: Only the physician who issued the prescription can change it. The current participant is: 1772 But the issueing Physican has userId: undefined The Issueing Physician is:Relationship {id=org.[...].participant.Physician#1772} His name is: undefined"

Fabric 版本是 hlfv12。出于测试目的，我授予所有参与者管理员权限。

交易的js代码：

/**
* Update a prescription.
* @param {org.[..].UpdatePrescription} transaction
* @transaction
*/

async function processUpdatingOfPrescription(transaction) {
     var prescriptionItemAssetRegistry = await getAssetRegistry('org.[..].Prescription');
     var itemToUpdate = await prescriptionItemAssetRegistry.get(transaction.recordId);
     if (getCurrentParticipant().userId == itemToUpdate.issueingPhysician.userId && itemToUpdate.status !== 'DELETED') {
     // [...]
     }
     else { // only to demonstrate that it is the same user:
         throw new Error('Only the physician who issued the prescription can change it. The current participant is: ' + getCurrentParticipant().userId + 
                    ' But the issueing Physican has userId: ' + itemToUpdate.issueingPhysician.userId + 'The itemToUpdate is:' + itemToUpdate.issueingPhysician)
}

}

cto-File 中的资产：

asset Prescription identified by recordId {
  o String recordId
  o String prescribedDrug
  --> Physician issueingPhysician
 }

cto 文件中的用户（=医师）：

participant Physician identified by userId {
  o String userId
  o String firstName
  o String lastName
}

cto-File 中的事务：

transaction UpdatePrescription {
  o String recordId
}

我想获取 "itemToUpdate.issueingPhysician.userId" 的值。

Answer 1

当您检索资产时，您必须自己 'resolve' 关系 (itemToUpdate.issueingPhysician.userId)。在那里查看答案 AssetRegistry.get function is not returning the complete object in Hyperledger Composer for more info and the related issue tracker and status on Composer。

对于您的标识符比较 - 最好使用 getIdentifier() 获取每个资源实例的单一标识符，以便正确比较标识符本身：

尝试：

'NS' 以下是 'org.acme' 在我的场景中仅供参考。

async function processUpdatingOfPrescription(transaction) {
     var prescriptionItemAssetRegistry = await getAssetRegistry(NS + '.Prescription');
     var itemToUpdate = await prescriptionItemAssetRegistry.get(transaction.recordId);
     console.log('participant is ' + getCurrentParticipant().getIdentifier() );
     if (getCurrentParticipant().getIdentifier() == itemToUpdate.issueingPhysician.getIdentifier() && itemToUpdate.status !== 'DELETED') {
        console.log("yes they match !! ");
     }
     else { // only to demonstrate that it is the same user:
         throw new Error('Only the physician who issued the prescription can change it. The current participant is: ' + getCurrentParticipant().getIdentifier() + 
                    ' But the issueing Physican has userId: ' + itemToUpdate.issueingPhysician.getIdentifier() + 'The itemToUpdate is:' + itemToUpdate.issueingPhysician);
     }
}

为什么获取不到资产附属参与者的属性？

Why can't I obtain the attributes of a participant that is attached to an asset?

hyperledger-composer