this.findWhere = function(conn, coll, obj, cb) {
        if (obj === undefined)
            return cb('Some arguments are missing!');
        if (typeof obj !== 'object')
            return cb('ARG1 must be object!');
        var i = 0,
            arr = [],
            arrObj = [],
            key;
        for (key in obj) {
            var newObj = {};
            newObj['key'] = key;
            newObj['value'] = obj[key];
            arrObj.push(newObj);
        }
        async.eachSeries(arrObj, function(item, callback) {
                if (i === 0) {
                    new Graph().has(conn,coll,item.key, item.value, 'all', function(err, res) {
                        if (err) cb(err);
                        if (res.length === 0)
                            return cb(null, undefined);
                        if(res.length ===1)
                            return cb(null,res);
                        arr = res;
                        i++;
                        callback();
                    });
                } else {
                    for (var j = 0; j < arr.length; j++) {
                        if (arr[j][item.key] !== item.value) {
                            arr.splice(j, 1);
                            j--;
                        }
                    }
                    i++;
                    if (i === arrObj.length)
                        cb(null, arr);
                }
            },
            function(err, res) {});
    }