Issue meteor#13121 updated the error handling within the Meteor metho…

…d for inserting data into a MongoDB collection

packages/allow-deny/allow-deny.js

@@ -193,14 +193,19 @@ CollectionPrototype._defineMutationMethods = function(options) {
  }
  } catch (e) {
  if (
- e.name === 'MongoError' ||
+ e.name === 'MongoError'  && e.code === 11000 || 
  // for old versions of MongoDB (probably not necessary but it's here just in case)
  e.name === 'BulkWriteError' ||
  // for newer versions of MongoDB (https://docs.mongodb.com/drivers/node/current/whats-new/#bulkwriteerror---mongobulkwriteerror)
  e.name === 'MongoBulkWriteError' ||
  e.name === 'MinimongoError'
  ) {
- throw new Meteor.Error(409, e.toString());
+ // Extract the index name from the error message
+ const match = e.errmsg.match(/index: (.+?) dup key/);
+ const indexName = match ? match[1] : 'unknown';
+
+ // Throw a specific Meteor.Error with the index name
+ throw new Meteor.Error(409, `Duplicate key error on index: ${indexName}`);
  } else {
  throw e;
  }