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Great Reads

Working with MongoDB's $lookup Aggregator

by Marc Clifton

A deep dive into the $lookup aggregator with examples of one-to-one, one-to-many, many-to-many, and nested relational "queries"

Aggregation in MongoDB

by Vikas Sharma

In this article, we will focus on aggregation pipeline. I'll try to cover each major section of it using simple examples. We will be writing mongo shell commands to perform aggregation.

Storing Tree like Hierarchy Structures With MongoDB

by Vyacheslav Voronenko

Three approaches to store tree like structures with NoSQL databases in MongoDB

Run Database and GUI Clients in Docker

by DiponRoy

Quick start example to run DB and clients in docker

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All Articles

MongoDB

"Attributeerror: 'nonetype' object has no attribute 'data' " cannot find solution a

15 Aug 2022 by Prathmesh Upadhyay

-2 I am working with mongodb and python flask. Every time I run flask I receive this error on the local host and the terminal query = db.Data.find(upsert=True) AttributeError: 'NoneType' object has no attribute 'Data' What I have tried: ...

"Attributeerror: 'nonetype' object has no attribute 'data' " cannot find solution a

15 Aug 2022 by Richard MacCutchan

You need a method to get the database reference, the db variable does not exist in the functions you are using. See Welcome to Flask — Flask Documentation (2.1.x)[^] for details of how to do it correctly.

3 Best Practices for GUID data in MongoDB

5 May 2015 by Tomasz Naumowicz

Take a closer look at scenarios where working with GUID and UUID in a MongoDB environment becomes tricky. We will make you aware of those configurations and provide a set of best practices to follow.

product-showcase

[TinyERP: SPA for Enterprise Application]Add new staff

19 Nov 2018 by tranthanhtu.vn

Overview. As mentioned in "Manage Staffs - Part 2" part, It was easy to query the list of staffs as they were prepared before hand.. All necessary preparation steps occurred in "Add/ update staff information".. Let see "Add staff" first.. Add the following line into staffs.

[TinyERP: SPA for Enterprise Application]Cross Modules/ Domains Communication

26 Nov 2018 by tranthanhtu.vn

[TinyERP: SPA for Enterprise Application]Cross Modules/ Domains Communication

[TinyERP: SPA for Enterprise Application]Manage Staffs - Part 2

27 Dec 2018 by tranthanhtu.vn

[TinyERP: SPA for Enterprise Application]Manage Staffs - Part 2

entity-framework

Access Layer light and fast data: MongoDB / .NET

19 Feb 2016 by mbruchet

MongoDB, everyone talks about it, here article guides you step in its integration with Microsoft.NET.

Accessing a REST Based Database Backend From an Android App

6 Apr 2015 by Android on Intel

The objective of this article is to show a method for accessing a REST based database backend from an Android* app using MongoDB* and Spring IO*.

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Adding new documents to a collection in Mongodb

12 Apr 2015 by ColdskyXia

How to add new documents to a collection more efficiently

Aggregation $graphlookup is not giving proper response in nodejs but working in mongoplayground

9 Nov 2022 by Vamsi Deepak

I am using $graphlookup with mongoose , it is working fine in mongoplay ground but in nodejs it is not giving tree structure data. Instead it is giving TreeResult as empty array Please find the below details: below is the my method in nodejs...

Aggregation in MongoDB

27 Oct 2016 by Vikas Sharma

In this article, we will focus on aggregation pipeline. I'll try to cover each major section of it using simple examples. We will be writing mongo shell commands to perform aggregation.

An unhandled exception of type 'system.stackoverflowexception' occurred in omobranch.dll

29 Jan 2017 by Member 12973378

using OMOBranch.DAL;using System;using System.Collections.Generic;using System.ComponentModel.DataAnnotations;using System.Linq;using System.Web;namespace OMOBranch.Models{ public class Institution { [Key] [Required] [Display(Name =...

An unhandled exception of type 'system.stackoverflowexception' occurred in omobranch.dll

29 Jan 2017 by F-ES Sitecore

You get a stack overflow when something gets into an infinite function call loop, like thispublic void MethodA(){ MethodA();}In the above MethodA calls itself and every time this happens it reserves space on the stack but the stack is finite so eventually it calls itself so...

Any mongo experts here ?

27 Aug 2016 by pkfox

Hi all, I have a collection in a mongodb database which has the form{"_id" : ObjectId("57bffb4763e3de564a9f230d"), "id" : 29942, "title" : "01 Ain't talkin about love", "genre" :...

Anyone has installed mongo db in win 32 bit system, please help.

13 Apr 2015 by Am Gayathri

Anubody has installed mongo db in win 32 bit system, please help.I dont find Mongo DB set up file for Win 32 system in mongo db official site.[Mongo Db downloads]Here i can see set up for 64 bit but my system is 32. :(.I just installed RoboMongo without installing any other mongo db...

Anyone has installed mongo db in win 32 bit system, please help.

13 Apr 2015 by Black_Rose

You can try downloading from herehttps://www.mongodb.org/dl/win32/i386[^]

Anyone has installed mongo db in win 32 bit system, please help.

13 Apr 2015 by Am Gayathri

I got another link to download Mongo db for win 7 32 bit.https://www.mongodb.org/downloads#previous[^]

Apply Filter on a Nested Array in a MongoDB

6 Jul 2017 by Pankaj Jha

This tip explains how to apply a filter on a nested array in a MongoDB collection.

Automate Database Backups with Customizable Recurring Schedules

1 Jul 2020 by Hariprasanth S

A CLI to automate database backups with customizable recurring schedules

Automating backup for MongoDB using CRON and S3CMD

19 Feb 2013 by Lazaro Lima

This paper attempts to pass all the steps to create an automated backup for a MongoDB Server on a Linux Server where all backups are sent to Amazon AWS S3 service scheduled through crontab.

Basics of MongoDB

12 Oct 2014 by binit.ku.singh

MongoDB was designed from the beginning to scale out. Its document-oriented data model allows it to automatically split up data across multiple servers.

Binding of List of Dictionary to WPF DataGrid at runtime

29 Jul 2017 by DevD9

Hello, I am working on one assignment using WPF and MongoDB. I need to generate WPF DataGrid(any other control will be fine if it works) at runtime from List of Dictionary. This is simple collection Dictionary where each Dictionary has different set of keypairs.So far i am...

Binding of List of Dictionary to WPF DataGrid at runtime

26 Dec 2012 by theHollow

HelloI would first of all choose the ObservableCollection instead of the List.That is because that list inherits the ICollectionChanged interface so that changes in the collection will appear in the UI when binding to the collection form the ItemSource property on the datagrid. Second, ...

Binding of List of Dictionary to WPF DataGrid at runtime

26 Dec 2012 by Oleksandr Kulchytskyi

Well obviously You might need to replace List> to more WPF convenient collection ObservableCollection> Items , where KeyValueHolder is siple entity , see:public class KeyValueHolder{ public string Key {get;set;} public string Value...

Binding of List of Dictionary to WPF DataGrid at runtime

19 Feb 2013 by DevD9

Thanks. This is how i resolve it.table = new DataTable(); dgSearchResult.Columns.Clear(); string broker = string.Empty; string producttype = string.Empty; string currency = string.Empty; string productsubtype =...

Binding of List of Dictionary to WPF DataGrid at runtime

8 Oct 2017 by Member 12805636

This is what i use to convert a dictionary-list to a datatable(credit to someone on StackOverflow) to which a datagrid can bind. N.B if T is not a value-type then you will need to specify the property (of interest). public static DataTable ToDataTable(string tableName, Dictionary

BookCars - Car Rental Platform with Mobile App

5 Apr 2024 by Akram El Assas

Car Rental Platform with a mobile app

Build Modern App with MEAN Stack 2.0 – Part 1

3 May 2017 by Pankaj Kumar Choudhary

Basics of MEAN stack development and concepts that are required for MEAN stack development

Build web app manager all database of MongoDB

8 Oct 2014 by Member 10492520

Hi guys!I want to buid website application with manager all database of MongoDB. This is mean web to same as mysqladmin but simple with operation (create, add, update, delete database). Can you help me this my solution?Thanks!

C# connect to mongodb with error

27 Oct 2014 by xinxin0629

my application host server is 192.168.248.142 and my mongodb server is 192.168.248.150, and now the mongodb server was started. the message was below:------------------------------------------------------------------------------------[root@mongodb ~]# mongod --port 27017 --bind_ip...

C# MongoDB - Polymorphic Collections with Generic CRUDs

8 Feb 2016 by Shi Her

Using the Mongo C# Driver in Visual Studio to connect to MongoLab and creating generic CRUDs.

Calculating the Probability of Related Events Based on Bayes' Theorem Using MongoDB Aggregation Framework in C#

29 Jan 2016 by Alazar 9860585

Calculating the Probability of Related Events Based on Bayes' Theorem Using MongoDB Aggregation Framework in C#

Can I use mongo DB in Cpanel? How (if I can)?

16 May 2014 by Karim Pazoki

Can I use mongo DB in Cpanel? How (if I can)?

Choose the Right Model: Comparing Relational, Document, and Graph Databases

24 Nov 2021 by Arctype SQL

There are three major types of database models in use today. Learn about their differences and what applications they are good for.

Choosing MySQL or NoSQL Database For My Scenario

11 May 2015 by bilal78699

Hello All,I have a scenario where i have to store timesheets of different projects. The object graph is like this:Timesheet->Project->UserA user can create multiple projects. And a project can have multiple timesheets. So in my scenario it is expected that timesheet data will grow...

Connect MongoDB from Any Working Directory on ubuntu

4 Nov 2014 by binit.ku.singh

Connect MongoDB from any working directory on ubuntu

Connect MongoShell to Atlas Cluster on Windows 10

11 Jul 2017 by Vishal_Gupta

Steps to connect Mongo shell to Atlas Cluster

Connecting .NET Application to MongoDB

19 Nov 2013 by anoopk01

This tip shows how to connect with MongoDB from a .NET application.

Continue With Learning Indexes in MongoDB

6 Mar 2018 by Sibeesh Passion

Continue with learning indexes in MongoDB

could someone provide links to mongodb projects?

15 Jun 2015 by Member 11768790

i am new to mongodb and want to work on a project,but i cant find any good source for projects so please answer some good links..

could someone provide links to mongodb projects?

15 Jun 2015 by Krunal Rohit

Hey,This isn't how it works. We're not here to google for you. You can google this simple thing by yourself.After getting the proper project, if you stuck somewhere then let us know, we'd help you but not this way.Hope I'm clear to you.-KR

Create a login authentication page in react.js

22 Feb 2017 by Graeme_Grant

Have you looked on Google Search? I can see many helpful examples for you: react.js login page[^] like:* Tutorial: Build a React.js Application with User Login & Authentication | Stormpath[^]* 58 ReactJS Examples, Demos, Code[^]

Create OData endpoint for MongoDB on MEAN stack

28 Nov 2016 by Neal Pandey

This article is a tutorial on creating a basic OData (Open Data Protocol) endpoint for a MongoDB database using MEAN stack.

Creating a Chat Application in Node JS with Express, MongoDB, Mongoose and Socket.io

4 Dec 2017 by Sibeesh Passion

A chat application in Node JS with the back end MongoDB

Creating Contact Manager App with MEAN Stack

2 Oct 2017 by HHerzl

Creating Contact Manager App with MEAN Stack

Data Cache Synchronization using AWS SNS and Lambda

29 Dec 2015 by Peter Carrasco

This article describes a pub-sub model using AWS Lamdba along with SNS to keep your AWS-hosted RDMB system of record and cache in sync.

Database with same name created in mongodb?

7 Oct 2013 by xiaohan2012

I found that database with a same that already exists can be created, thus databases with the same names causes problems when I need to specify which databases I want to use.Here is how it happens: 1. I already have a database, with name "test1",which only stores collections with...

Datetimeoffset not getting mapped in mongodb C# driver

11 Jun 2020 by VICK

I am saving a field value as DatetimeOffset in Mongodb via C# driver which is being saved in the db as "createdAt" : [ NumberLong(637166528776997165), NumberInt(0) ] But when trying to get it back its not...

Developing Applications With Express Framework And Node.js - Quick Start

25 Dec 2014 by Tushar_Gupta

Walk through to quickly develop applications using Node.js and Express framework.

Devexpress xtrareport v21.2.6 mongodb object C# winformapp?

20 Sep 2022 by khraLiezx

Hello, I have a WinForm application. With this application, I insert the incoming orders detail into the MongoDB database. Some of my data types are Objects and inside the Objects again I have Objects Example of my Data in Database: "Products":...

Display image from mongodb gridfs to angularjs using webapi C#

3 Jan 2018 by VasanthPorcheziyan

Hi, I am trying to display stored stream in mongodb GridFS as image in angularjs using webapi c#. I am using mongodb 2.4.4 in my project. MongoDB Package : [^] What I have tried: I saved the stream from angular to mongodb using the below code. using (var stream = await...

Displaying value of object

20 Jul 2012 by Proboi

I am getting a JSON data from mongodb , when I alert that variable , it shows me the result as "object object". Now I want to view the values of the "object object". How could I do that...?

Displaying value of object

22 Jul 2012 by woutercx

Like this?http://www.9lessons.info/2009/10/json-jquery-ajax-php.html[^]

Dynamic menu mongoose

1 Feb 2020 by alym karim

I am trying to build a dynamic menu in nodejs with mongoose, but my method is not working. i get a list of menu items with an empty coreMongooseArray as its children property [{model.children = coreMongooseArray(0)}, {model.children = coreMongooseArray(0)}] , but i should be getting a list of...

Enabling IBM Bluemix on Intel® Edison Boards using MongoDB by Compose

20 Jun 2016 by Intel

This article explains how to establish a connection with IBM Bluemix cloud services using Node.js API.

Exclusive lock in distributed solutions with MongoDB

8 Dec 2016 by urigg123

Describes how to design a lock like mechanism in a distributed solution to allow exclusive access or leader election to one of the server components.

Find a Parent Control Recursively java

22 Aug 2014 by basker A

Recursive function - to get Children(might be parents too) of parentsoutput sample |-- Child 1.1 |-- Child 1.1.1 |-- Child 1.1.2 |-- Child 1.1.2.1 |-- Child 1.1.3 |-- Child 1.1.3.1 |-- Child 1.2 Parent 2 |-- Child 2.1 |-- Child 2.1.1 |-- Child...

Find Relative complement of two collection

16 Dec 2015 by srilekhamenon

i want the Relative complement of two collections in mongoDB sayLocalFile and ServerFile i have Local FIleA.txtB.txtC.txtand ServerFilesA.txti want the result B.txtC.txt

Fix for : The 'await' operator can only be used within an async method. Consider marking this method with the 'async' modifier and changing its return type to 'Task<System.Web.Mvc.ActionResult>' ?

9 Apr 2015 by Am Gayathri

How to fix below error?The 'await' operator can only be used within an async method. Consider marking this method with the 'async' modifier and changing its return type to 'Task'Am getting above error. I really don't have any idea about this. Could anyone help me on this?My code, ...

Fix for : The 'await' operator can only be used within an async method. Consider marking this method with the 'async' modifier and changing its return type to 'Task<System.Web.Mvc.ActionResult>' ?

9 Apr 2015 by johannesnestler

You Need to include "async" identifier in your method signature. MSDN is your friend: https://msdn.microsoft.com/en-us/library/hh191443.aspx[^]

Fix for : The 'await' operator can only be used within an async method. Consider marking this method with the 'async' modifier and changing its return type to 'Task<System.Web.Mvc.ActionResult>' ?

9 Apr 2015 by anil pathak

// it will work if your .net framework would be 4 or 4.5 or upper[HttpPost]public async Task Createaccount(Register reg){ if (ModelState.IsValid) { var client = new MongoClient(); var db =...

form login in j2EE with mongodb database

1 Mar 2013 by aminov

i'm charged to developp web application with J2EE using mongodb database firstly i'm trying with a simple exemple : form login but it doesn't work.i need a simple exemple using mongodb database

form login in j2EE with mongodb database

1 Mar 2013 by Abhishek Pant

Integrate MongoDB into java web applications[^]

form login in j2EE with mongodb database

1 Mar 2013 by Richard MacCutchan

Then you should do some proper research: like this[^].

Framework for Performing Aggregation and Plain MongoDB Queries in myBatis Style

12 Sep 2013 by dmgcodevil

Framework for performing aggregation and plain MongoDB queries in myBatis style

Get latest value in mongodb nested documents

15 Apr 2020 by coccide

Hi everyone. I'm trying to figure out how can I extract the latest value of say a variable in a set of documents. Let's say I have 2 documents: { "Name": "doc1", "Date": ISODate("2019-12-31T00:00:00.000Z"), "Values" : [ { ...

Get latest value in mongodb nested documents

15 Apr 2020 by coccide

Ok I managed to get what I want using some intermediate view objects but I think there should be a more elegant way to do that: var tutti = db.createView( "tutti", "docs", [ { "$unwind" : "$Values" }, { "$project": { "Name": 1, "Date" :...

Get location of multiple images in mongodb database

11 Aug 2020 by Tridib Chatterjee

I'm trying to upload multiple files from my NodeJs application to a MongoDB database using Multer. But the problem is when I'm saving the location of the file in my database only one file location is saved while others are ignored. This is...

Get location of multiple images in mongodb database

11 Aug 2020 by Tridib Chatterjee

// We loop throw the req.files array and store their locations in the temporal files array for (let i = 0; i

Getting problem with deploying node js application !

4 Sep 2022 by jon773599

I got index file code in output in Chrome first check this link My output in chrome click this link check In above link you can check my index,js file What I have tried: My package.json file { "name": "fact_new_backend", "version":...

Getting Started with Mean Stack

23 Dec 2015 by Ashwin. Shetty

Writing your first app using Mean Stack (M = MongoDB, E = Express.JS, A = Angular.JS and N = Node.js)

Getting started with MongoDB

11 Oct 2013 by ASP.NET Community

Getting started with MongoDBMongoDB is a famous representative of NoSQL databases. It is a document-oriented database, which means that data will

Getting Started with mongodb

8 Apr 2015 by ColdskyXia

How to get started with mongodb

Getting timeout exception in ASP.NET core web api while connecting with mongodb

22 Mar 2021 by Member 15090354

I have created mongo db and trying to call collection in asp.net core web api i am getting the below exception A timeout occurred after 30000ms selecting a server using CompositeServerSelector{ Selectors =...

Getting timeout exception in ASP.NET core web api while connecting with mongodb

22 Mar 2021 by thatraja

These might fix the issue How to fix MongoDB connection timeout?[^] c# - A timeout occured after 30000ms selecting a server using CompositeServerSelector - Stack Overflow[^]

Good web app framework backend for mobile SPA using REST/JSON and a NoSQL DB?

3 Sep 2014 by canam2

In researching technologies for development of a single-page web application (SPA) for mobile deployment, I am trying to determine a good backend web application framework to use.I like the idea of using a NoSQL DB with a clean REST/JSON API and plan to use an client-side MVC framework like...

web_development

GraphQL on Unstructured Data Context

25 Mar 2019 by Daniele Fontani, keggyy

In this article, we explain GraphQL and show how to use it with an unstructured database (MongoDB)

Hands-on: Build a Node.js-powered chatroom web app | Part 3

19 May 2015 by Rami Sayar

In this installment, I will show you how to use your existing express-based Node.js app to create a chatroom backend with WebSocket support.

Hi, Im using Java for loop to insert in MongoDB

20 Jun 2015 by Member 11780504

hi,I am using a javascript for loop in mongodb but i am getting multiple syntax errors or unexpected token errors, i am new to both the languages so i am not able to pinpoint the cause of the error, can you please help me by reviewing the below piece of code and letting me know where i went...

Hi, Im using Java for loop to insert in MongoDB

20 Jun 2015 by Mehdi Gholam

Arrays in javascript are separated by commas : http://www.w3schools.com/js/js_arrays.asp[^]

Hierarchical mongoose-query in seneca microservice with multiple levels

14 Sep 2016 by Timo Schüler

I need some help regarding a JavaScript Callback problem.I have a mongoldb-collection of samples in different levels. The structure looks like the following. I got documents in the form of:{_id: "1", "parent": ""}, {_id: "2", "parent": "1"}, {_id: "3", "parent": "2"}Now I want to query...

High Speed Message Bus using C# and MongoDB

25 Apr 2018 by Waseem Ahmed (Qatar)

High speed message bus using C# and MongoDB

Horizontal scaling .net C# / NodeJS, MongDB with Micro Services

29 Oct 2015 by Ashwin. Shetty

Scaling application Horizontally using Message queue

How can I add data from a subscheme to my mongodb database ?

7 Apr 2018 by Member 13767446

Backend Hey, I have this bandscheme in mongo: BandSchema = new Schema({ name: String, genre: String, cdlist: [{ cd: Cd }] }, { timestamps: true }); this cd scheme: const CdSchema = new Schema({ madeinyear: String, madeincountry: String, name:...

How can I copy one column from one collection to another collection in mongodb using Python

9 Jul 2018 by Member 13905116

Hello, Here i want to copy one column from one collection to another collection with certain mapping in mongoDB using python language. What is the query i have to write.? Please help. Thanks in advance. What I have tried: Pymongo Mongoclient Os Sys Mongoconnection $eq $gte these modules

How can I create a shared database mongo object and use in migrate nodejs file?

25 Apr 2022 by stackprogramer

For my express.js project, I use the migrate package to manage the Models of my Mongo database. I defined database object in db.js file.Then I used it in migrate file. //db.js file const mongoClient = require('mongodb').MongoClient; const...

How can I develop ecommerce site by prestashop platform with nodejs and react?

8 Aug 2020 by Richard MacCutchan

The fairly obvious answer is that you study each of these subjects in depth and learn how to get them to work together to do what you want. There is no shortcut to becoming an experienced developer, only practice, practice, practice.

How can I develop ecommerce site by prestashop platform with nodejs and react?

8 Aug 2020 by Mahdi-Soultana

i have learn a lot in Node.js mongoose react but i see the most in my city office work in eCommerce local so they have site developed by prestashop the problem is how can i work with prestashop by my knowledge Node.js React mongoose Express to...

How can I do that in C# with reflection?

24 Oct 2023 by aledeol

I'm trying to do a generic persist method using reflecion and MongoDB. The normal code is: public bool InsertParent(ParentDTO parent) { var collection = db.GetCollection(ParentCollectionName); var...

How can I do that in C# with reflection?

22 Oct 2023 by Member 16121670

Hi, I know it's a bit late to answer this question, but you could use reflection to construct the generic method with something similar to this: //var typeO = objeto.GetType(); //here is the problem. The var typeO is not accepted. //var...

How can I list in a hadlebars file all the data coming from a collection in mongodb?

29 May 2023 by Bárbara 2023

Hi everyone, Im tryingto to list the data coming from the mongo db in a file handlebars. But the problem is that when I load the screen, only the message "Category Listing" appears and the names of the categories do not appear as requested: ...

How can i remove a specified field from a mongoose document?

17 Feb 2016 by Member 10314038

I would like to remove dynamically a field from a mongoose document/What I have tried:I am using $unset and when I type the value "cars.BMW" it works. But when I want to pass a parameter, which will be a car brand and then to unset it. I tried {$unset: {"cars."+brand: " "}} but the plus...

How can I use one API function for login in two different projects with two mongodb databases

8 Nov 2015 by Member 10752313

I want to write a common API for login in two different projects with two different databases. How can I identify which project call the API and corresponding database to be used for the API function?

How can update the objects in an array in mongoose?

13 Mar 2022 by Arslan Anjum 2021

I have searched a lot but couldn't solve this problem. This is the Schema const ToDosSchema = mongoose.Schema({ userId: { type: String, required: true }, ToDo: [{ Task: { type: String, ...