random data mongo

db=db.getSiblingDB("school");
db.person.drop();
var characters       = ['a','b','c','d','e','f','g','h','i'];
var charactersLength = 9;

function getRandomInt(n) {
  return Math.floor(Math.random() * n);
}

function shuffle() {
  var arr = characters;           // Convert String to array
  var n = charactersLength;              // Length of the array
  
  for(var i=0 ; i<n-1 ; ++i) {
    var j = getRandomInt(n);       // Get random of [0, n-1]
    
    var temp = arr[i];             // Swap arr[i] and arr[j]
    arr[i] = arr[j];
    arr[j] = temp;
  }
  
  s = arr.join('');                // Convert Array to string
  return s;                        // Return shuffled string
}

// 1 million students
for (i = 0; i < 1000000; i++) {
    
  
		class_id = Math.floor(Math.random()*501); // get a class id between 0 and 500

    var contactNo= Math.floor(10000000000 + Math.random() * 90000000000);

		var name=shuffle();

    var school=shuffle();

    var college=shuffle();

    var versity=shuffle();
		
		var occupation=shuffle();

		var religion=shuffle();

    var tag = [shuffle(),shuffle(),shuffle()];



		record = {'class_id':class_id,'contactNo':contactNo,'name':name,'school':school,'college':college,'versity':versity,'occupation':occupation,'religion':religion,'tag':tag};
		db.person.insert(record);
    
} 

// load("/home/motaher/Desktop/mongo4.js");