![]() ![]() "_id" : ObjectId("628bc4a45c544feccff5a567"),ĭisplay documents from the userAddress: > db.userAddress.find().pretty() In the following code snippet, the pretty() method shows the clean and formatted output, which is easy to understand on the shell.ĭisplay documents from the userInformation: > db.userInformation.find().pretty() Now, we can use the commands below to see the data for both collections. ![]() We use the insertMany() function to insert multiple documents. Populate the userAddress collection with two documents: > db.userAddress.insertMany( Populate the userInformation collection with two documents: > db.userInformation.insertMany( Further, populate them with documents as follows.Ĭreate database and collections: > use users We have done that using the following queries you can do so also.Ĭreate two collections named usersInformation and userAddress that reside in the users database. Join two collections using a compass (a graphical interface of MongoDB)įor all of the above scenarios, we must have a database containing two collections (same as tables in MySQL) populated with documents (same as records in MySQL).Use the $project filter stage in aggregation queries to join two collections.Use the $unwind operator to flat an array before attaching it to the resulted documents.Use the pipeline operator to join two collections based on the specified condition.Use the $lookup aggregate stage to join two collections.Some of them are given below, which we will cover in this tutorial. We have different approaches for combining two collections into one collection using MongoDB. Combine Two Collections Into One Collection Using MongoDB Today, we will use the $lookup aggregate stage, pipeline and $unwind operators, $project filter stage, and MongoDB Compass to combine two collections into one collection. Join Two Collections Using Compass (Graphical Interface of MongoDB).Use the $project Filter Stage in Aggregation Queries to Join Two Collections Into One.Use the $unwind Operator to Flat Array Before Attaching to the Resulted Documents.Use the pipeline Operator to Join Two Collections Into One Based on the Specified Condition.Use the $lookup Aggregate Stage to Join Two Collections Into One.Combine Two Collections Into One Collection Using MongoDB.The hostname "mongodb:///test" is the host name of my Compass session. app crashed - waiting for file changes before starting. One I run Node app.js in terminal I get nnect.į:\code\vidjot\node_modules\mongodb\lib\operations\mongo_client_ops.js:439ĪssertionError : null = 'MongoNetworkError: failed to connect to server on first connect [MongoNetworkError: getaddrinfo EĪt err (F:\code\vidjot\node_modules\mongodb\lib\utils.js:415:14)Īt executeCallback (F:\code\vidjot\node_modules\mongodb\lib\utils.js:404:25)Īt err (F:\code\vidjot\node_modules\mongodb\lib\operations\mongo_client_ops.js:284:21)Īt connectCallback (F:\code\vidjot\node_modules\mongodb\lib\operations\mongo_client_ops.js:240:5)Īt process.nextTick (F:\code\vidjot\node_modules\mongodb\lib\operations\mongo_client_ops.js:436:7)Īt _combinedTickCallback (internal/process/next_tick.js:131:7)Īt process._tickCallback (internal/process/next_tick.js:180:9) Use connect method to connect to the server const express = require('express') Ĭonst MongoClient = require('mongodb').MongoClient Ĭonst url = "mongodb:///test" However when I try to connect my Node.js server to Compass I get an error, Below is my node code. I can connect Compass to the cluster it all works fine. ![]() I have created a MongoDB cluster and downloaded Compass. I am trying to send data from node.js to a mongoDB compass server.
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