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Adding asset to participant in hyperledger-composer: Error Message “Model violation …”

In my hyperledger-composer application, I have Consultants and Skills. Furthermore, I have a transaction called "UpdateSkillsOfConsultant", with which a skill can be added to a consultant.

However, submitting the transaction results in the following error message:

I have no idea what I am supposed to do with this error message.

I created a minimal example, that can be copied and pasted into the composer -playground.

This is the stuff to be copied into the model.cto file:

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
}


And here is the content of the script.js file:

'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;
}


To reproduce the error just copy and paste everything in the composer playground, create a Consultant, create a Skill and then try to submit transaction "org.comp.myapp.UpdateSkillsOfConsultant".

1 Answer
1

This is a javascript issue. The line


for (newSkill in transaction.newSkills) {



for (newSkill in transaction.newSkills) {


is returning the keys of the array (which would be 0,1,2...) if you only pass in 1 value to the array then it returns the value 0 which is the error you are seeing. Change the line to

0


for (newSkill of transaction.newSkills) {



for (newSkill of transaction.newSkills) {


that will fix your problem.

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