Gets all database id's in the model

GetAllDbIds.js

// Used in blog post http://adndevblog.typepad.com/cloud_and_mobile/2016/10/get-all-database-ids-in-the-model.html
function getAllDbIds(viewer) {
  var instanceTree = viewer.model.getData().instanceTree;

  var allDbIdsStr = Object.keys(instanceTree.nodeAccess.dbIdToIndex);

  return allDbIdsStr.map(function(id) { return parseInt(id)});
}