code: function(callback){
          var cursor = db.db(dbName).collection(collectionName).find({}).toArray(function(err,result){
              if(result.length!=0){
                  roadmapNum = roadMapIdTemp = parseInt(result[result.length-1]['roadMapId'])+1;
              }
              else{
                  roadmapNum = roadMapIdTemp = 1;
              }
              db.db(dbName).collection(collectionName).insertOne({
                  "roadMapId" : roadMapIdTemp.toString(),
                  "clientId" : source['clientId'],
                  "orderNode" : source['orderNode'],
                  "initNode" : source['initNode'],
                  "lastNode" : source['lastNode'],
                  "incomingNode" : source['incomingNode'],
                  "outingNode" : source['outingNode'],
                  "isInput" : source['isInput'],
                  "isOutput" : source['isOutput'],
                  "nodeIds" : source['nodeIds']
              },function(err, result){
                  response.send(roadmapNum.toString());
              });
          });
  
      }
docs: run roadmap of save it to mongodb.