lib/backup.js
var CREATE = require('./create');
var READ = require('./read');
/**
* backup saves versions of records before an UPDATE or DELETE is executed
* @param {Object} res - the record we want to be backed up
* @param {Function} callback - the function to be called after backup complete
*/
module.exports = function backup(res, callback) {
// we want to take a SNAPSHOT of the record BEFORE it gets updated/deleted
var record = {};
for(var key in res._source) { // get contents of recort as it CURRENTLY is
record[key] = res._source[key];
}
record.index = res._index
record.type = res._type + "_bak" // http://en.wikipedia.org/wiki/Bak_file
record.id = res._id +'_' + res._version;
return CREATE(record, callback);
}