向 hyperledger-composer 中的参与者添加资产：错误消息 "Model violation ..."

Question

在我的 hyperledger-composer 应用程序中，我有顾问和技能。此外，我有一个名为 "UpdateSkillsOfConsultant" 的事务，可以将技能添加到顾问中。

但是，提交交易会导致出现以下错误消息：

我不知道我应该如何处理这个错误消息。

我创建了一个最小示例，可以将其复制并粘贴到 composer -playground 中。

这是要复制到 model.cto 文件中的内容：

namespace org.comp.myapp



abstract participant User identified by id {
  o String id
  o String firstName
  o String lastName
  o String email
  o String password
}

participant Consultant extends User {

  --> Skill[] skills optional

}

asset Skill identified by id {
  o String id
  o String name
  o Proficiency proficiency
}

enum Proficiency {
  o Beginner
  o Intermediate
  o Advanced
}


transaction UpdateSkillsOfConsultant {
  --> Consultant consultant
  --> Skill[] newSkills
}


event ConsultantUpdated {
  o Consultant consultantOld
  o Consultant consultantNew
}

这里是 script.js 文件的内容：

 'use strict';



    /**
 * transaction UpdateSkillsOfConsultant
 * @param {org.comp.myapp.UpdateSkillsOfConsultant} transaction
 * @transaction
 */
async function updateSkillsOfConsultant(transaction) {

    // Save the old version of the consultant:
    const consultantOld = transaction.consultant;

    // Update the consultant with the new skills:
    const existingSkills = consultantOld.skills;
    for (newSkill in transaction.newSkills) {

            if (!transaction.consultant.skills) {
                transaction.consultant.skills = [newSkill];
            }
            else {
                transaction.consultant.skills = transaction.consultant.skills.concat(newSkill);
            }  

    } 

    // Get the participant registry containing the consultants:
    const participantRegistry = await getParticipantRegistry('org.comp.myapp.Consultant');

    // Update the consultant in the participant registry:
    await participantRegistry.update(transaction.consultant);

    // Emit an event for the modified consultant:
    let event = getFactory().newEvent('org.comp.myapp', 'ConsultantUpdated');
    event.consultantOld = consultantOld;
    event.consultantNew = transaction.consultant;
    emit(event);


}




//helper function:

function findSkill(array, name) {
    if(array) {
        for (let i=0; i<array.length; i++) {
            if (array[i].name == name) {
                return array[i];
            }
        }
    }
    return null;
}

要重现错误，只需复制并粘贴 composer playground 中的所有内容，创建顾问，创建技能，然后尝试提交交易 "org.comp.myapp.UpdateSkillsOfConsultant"。

Answer 1

这是一个 javascript 问题。行

for (newSkill in transaction.newSkills) {

返回数组的键（即 0,1,2...），如果您只将 1 个值传递给数组，那么它 returns 的值 0是您看到的错误。将行更改为

for (newSkill of transaction.newSkills) {

这将解决您的问题。

向 hyperledger-composer 中的参与者添加资产：错误消息 "Model violation ..."

Adding asset to participant in hyperledger-composer: Error Message "Model violation ..."

hyperledger-composer