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$response = array();

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Model Tree Structures in MongoDB
URL :http://docs.mongodb.org/manual/tutorial/model-tree-structures/#model-tree-structures-with-materialized-paths
To model hierarchical or nested data relationships, you can use references to implement tree-like structures. The following Tree pattern examples model book categories that have hierarchical relationships.

Model Tree Structures with Child References

(link)

The Child References pattern stores each tree node in a document; in addition to the tree node, document stores in an array the id(s) of the node’s children.

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//first in main controller

var myApp = angular.module('starter.controllers', []);

myApp.constant('mySettings', {
    apiUri: '/api/foo',
    nsUri: 'mySite/foo.xsd',
    nsPrefix: 's'
});

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//in the controller

getEmail = function() {
            var email = {
                firstName: "Abhijit",
                lastName: "Gaikwad",
                address: "[email protected]",
                subject: "Something interesting",
                body: "Hey there, i m testing sending email in angular"
            };

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//in the mail controller

var myApp = angular.module('starter.controllers', []);


myApp.filter('escape', function() {
  return window.escape;
});

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//add following to the controller

        $http.defaults.headers.post["Content-Type"] = "application/x-www-form-urlencoded";

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$http({
    url: user.details_path, 
    method: "GET",
    params: {user_id: user.id}
 });

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app.use(function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
    next();
});

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public static List<ArrayList<Integer>> arrayCombinations(int[] inputArr) {
		List<ArrayList<Integer>> result = new ArrayList<ArrayList<Integer>>();

		result.add(new ArrayList<Integer>());

		for (int i = 0; i < inputArr.length; i++) {

			ArrayList<ArrayList<Integer>> current = new ArrayList<ArrayList<Integer>>();

			for (ArrayList<Integer> local : result) {

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Arrays.copyOfRange(oldArray, startIndex, endIndex);