hyperledger composer adding Participants to array of Participants in transaction process

Question

I have defined Participant and asset as below and I want to add a particular participant to array of access[type Participant] in transaction. Can someone tell me how this can be done.

How can I add the participant identity to the array. How do I need to pass the identity through params and then add it to the array of participants. I have created the permissions according to the question I asked earlier. Link to the question for permission

ASSET DECLARATION

asset Details identified by detailsId {
     o String detailsId
     o String description optional
     --> Bank owner
     o Bank[] access optional
     o String document 
}

PARTCIPANT DECLARATION

participant Bank identified by bankId {
   o String bankId
   o String Name
}

Answer 1

You have made a small change to the model between the ACL example and this example - changing the access array which was a relationship before.

--> Bank[] access optional    original
  vs
o Bank[] access optional      here  

Based on the original model, first add this Transaction to the model:

transaction AddAccess {
  --> Details details
  --> Bank additionalAccess
}

Then, this scripted Transaction should work for you:

/**
 * Adding a Bank to an access list
 * @param {org.example.test.AddAccess} addA 
 * @transaction
 */
async function addAccess(addA) { 

  // Add the new access to the array, checking if empty first as it is optional field at creation
  if (typeof addA.details.access == 'undefined') {
    addA.details.access = new Array();
    addA.details.access[0] = addA.additionalAccess;
  } 
  else {
    addA.details.access.push(addA.additionalAccess);
  }

  // get the Registry
  const assetRegistry = await getAssetRegistry('org.example.test.Details');

  // Update the Registry with the new details
  await assetRegistry.update(addA.details);
}

Test with JSON like this:

{
  "$class": "org.example.test.AddAccess",
  "details": "resource:org.example.test.Details#D11",
  "additionalAccess": "resource:org.example.test.Bank#9241"
}