restoreState.js

// Required Node Packages
var async = require('async');
var minimongo = require('minimongo');

var IndexedDb = minimongo.IndexedDb;

/*
 * Executes deleteRemovedSeries, storeSchemaFlag, createFolderHierarchyFlag
 */
var restoreState = function (cbRestoreState) {
  new IndexedDb({namespace: 'mydb'}, function (db) { // eslint-disable-line no-new
    db.addCollection('tciaSchema', function () {
      async.parallel({
        // Adds 'toRemove' class to seriesArray elements and deletes them
        deleteRemovedSeries: function (callback) {
          db.tciaSchema.findOne({'_id': 'removedSeries'}, {}, function (doc) {
            if (doc && doc.seriesArray.length) {
              async.each(doc.seriesArray, function (item, cbItem) {
                $("[id='row_" + item + "']").addClass('toRemove');
                cbItem();
              }, function (err) { // eslint-disable-line handle-callback-err
                dTable.rows('.toRemove').remove().draw();
                callback(null, null);
              });
            } else {
              callback(null, null);
            }
          });
        },
        // returns storeSchemaFlag if schemaExist
        storeSchemaFlag: function (callback) {
          db.tciaSchema.findOne({'_id': 'storeSchemaInfo'}, {}, function (schemaExist) {
            if (!schemaExist) {
              callback(null, 0);
            } else {
              callback(null, 1);
            }
          });
        },
        // returns createFolderHierarchyFlag if folderHierarchyExist
        createFolderHierarchyFlag: function (callback) {
          db.tciaSchema.findOne({'_id': 'createFolderHierarchyInfo'}, {}, function (folderHierarchyExist) {
            if (!folderHierarchyExist) {
              callback(null, 0);
            } else {
              callback(null, 1);
            }
          });
        }
      },
      function (err, results) { // eslint-disable-line handle-callback-err
        // results: {storeSchemaFlag: 0/1, createFolderHierarchyFlag: 0/1}
        cbRestoreState(results);
      });
    }, function (err) {
      console.log(err);
    });
  });
};

module.exports.restoreState = restoreState;