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<p><span><span><span>Mongoose connect to multiple collections createConnection(mongodbUri). May 9, 2021 · As there are several collections in the database, a separate callback function needs to be used. Let Bite-sized Mongoose tutorials for busy developers. May 9, 2023 · The following steps have to be followed to Join 2 Collections in MongoDB using the compass, Launch Compass and connect to your MongoDB instance. Feb 6, 2021 · If they are multiple databases in the same server, you can use useDb. Learn more about Teams Multiple populates - mongoosejs Mongoose. If you’re used to traditional SQL database engines like MySQL, you will surely have come across the JOIN keyword, which allows you to combine data from multiple tables. It then goes on to show how we can use Mongoose to provide database access for the LocalLibrary website. Since unsharded I have a large collection of 300 question objects in a database test. createConnection() is used. Together, they are a powerful combo for building modern web… Jul 17, 2021 · When connecting to mongodb via mongoose, if your mongodb uri doesn't contain any database name then it will connect to test database. js: If you need connections to different databases look here Mongoose and multiple database in single node Jan 26, 2024 · Learn how to effectively manage multiple collections in MongoDB using Mongoose and Node. ObjectId, ref: 'userRoles', required: [true, 'Please Select a Role'] } This field will be responsible to save the role id, it’s a join field. js involves defining different Mongoose schemas and models for each collection. Typically, when working with Mongoose, you define a schema to structure your data before interacting with the database. It explains how object schema and models are declared, the main field types, and basic validation. Unfortunatley, the only way I know how to render the view is to call res. Mongoose access multiple collection. 2 now allows one to combine data from multiple collections May 20, 2024 · To retrieve data from two different collections in MongoDB using Node. All apps use the same mongoose models, so the same models are already available in my worker app. connect('localhost',db); but it does not work I receive this error: Error: T Mar 17, 2025 · A Mongoose connection is a Node. The Default mongoose. ). js and MongoDB. 0. Transactions let you execute multiple operations in isolation and potentially undo all the operations if one of them fails. The main function attempts to establish a connection to the MongoDB database using mongoose. We have an accounts collection and a customers collection. 10. This is best addressed using the Database Level Throughput option, which was previously discussed. If you are expecting it the other way around, then you either include the references as an "array" in each Student or you query and combine manually, looking up the "student" field in the WorksnapTimeEntry. js application. Also please make sure that you have tried that method yourself. Mongoose creates a default connection when you call mongoose. when using Mongoose, developers define a schema to structure their data, ensuring con Aug 3, 2019 · Now I want to use Mongoose to practice. Setting up global Mongoose options (e. A buye Nov 25, 2020 · Well, i am stuck in little technical stuff let me explain. 每个连接，使用mongoose. we've tried to use createConnection() and openSet() in mongoose, but it was not the solution. This comprehensive guide covers schema design, connection management, and practical code examples for creating and interacting with various collections. Apr 10, 2012 · Since all collections are in the hash mongoose. Discriminators are a schema inheritance mechanism. Some instances why you might require multiple connections: you have more than one Mar 30, 2020 · How to Connect MongoDB to Node. He also is requesting a lot of specifics about the cluster, and one of them being that he wants to be able to query across multiple databases. Structure Models by Domain. Asking for help, clarification, or responding to other answers. But MongoDB Atlas uses clusters with databases inside which again has collections. json file is located. Setting up Mongoose. Basically 1 express app with multiple connections. This guide will get you started using transactions with Mongoose. Another reason is to work around slow trains. Once installed, setup a connection to your MongoDB database: Apr 23, 2016 · You are doing it the wrong way around. js is a fast JavaScript runtime. But I am unable to reproduce my requirements. But I am unable to do so. js application using mongodb native driver. Sets the value of the option key. catch(err => console. Let Apr 5, 2025 · The Mongoose Schema API Connection. Hope someone can clarify more about this. Jul 9, 2015 · Depending which app sent the job, it needs to connect to the appropriate mongo database through mongoose. In this tutorial we’ll show you a simple example of a one-to-many join using the popular Mongoose library which lets you work with a Mongo Database. MongoDB 3. collections, you might simply list them for ( collection in mongoose. prototype. connection. js. Apr 10, 2023 · Hello! For starters, I am new to MongoDB. values, customfields. At best every time you'll need to use mongoose. My MongoDB Database name is myWebsiteDB: myWebsiteDB has 2 collections: dinners and emails. disconnect(); mongoose. connect() but I understood that this basically "maps" that mongoose connection with the global connection, so what I'm trying to use is mongoose. collections ) { mongoose Apr 22, 2012 · This is an old question, but it came up first for me in google results when searching "mongoose insert array of documents". Each type is consisting of different existing fields (indexes), such an example: Type: Estate, Subtype: House other fields garage (Int) (index) bathroom (Int) (index) bedroom (Int) (index) building_size (Int) (index) land_size Apr 15, 2025 · A Mongoose connection is a Node. In this article, we will explore the find() method in detail, its syntax, parameters, and how to implement Jan 9, 2022 · Hi, I need help sone help here. Defining the connection name if you have multiple databases. I need a way of inserting the data in bulk into MongoDB without find query for data id. $ node node-js-mongoose. MongoDB is the natural choice for Node. model. connect() method will give you the global database connection accessible throughout the app, you cannot switch the Oct 16, 2021 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. createConnection. Jul 12, 2019 · In the app. g. js with Mongoose MongoDB is a flexible NoSQL database, and Node. View a more thorough discussion here of the pros/cons of each option: Mongoose (mongodb) batch insert? mongoose. connect ('mongodb://user a single value into multiple values for storage. connect, and logs a success message if the connection is successful. 0. customfield in the customfield collection. Apr 10, 2021 · Hi there, pretty much I just want to quick as about should it be going with Single collection or Multi collection. Dec 30, 2023 · This establishes a single database connection which suffices in many applications. Below scripts work fine as my Restful API layers. I am using Mongoose to connect to the database (mongodb://localhost:3002/ I'm with same problem, and now I know it has to do with the fact that you cannot res. However, with NoSQL databases like MongoDB, joins are not an option, since they are, by definition, not Oct 20, 2013 · Definitely the best and most real-world example. js application, you can follow a simple process using the Mongoose library, which provides a flexible way to work with MongoDB. Then each DB connection gets imported respectively into their schema files, from which the schema files have module exports. connect(process. Is it possible to have multiple collections in mongoDB that I can read and write too using the same mongoose connection? I have a collection that is a list of products. Similar to the top answer above, but this code displays the name for each collection, without the other added information (such as type, options, info, etc. I created this project to identify a problem with NestJS, Mongoose and MongoDB. My database is called "test_db" and collection name is "users" where woul Dec 30, 2023 · Overview. like I have multiple records in social collections for the single user – Venkatesh Somu Jul 21, 2019 · So far we've seen how to connect to MongoDB using Mongoose's default connection. Jun 18, 2018 · I have multiple databases with multiple collections inside my MongoDB. Oct 27, 2020 · How to connect Mongoose + MongoDB. If this issue arrises when you deploy it such as on Heroku. You can also explicitly create a collection with various options, such as setting the maximum size or the documentation validation rules. Installing Mongoose is a straightforward process using npm: npm install mongoose. useDb('postsDB'); Only do this if you have a good reason too though, the more standard approach would be to use multiple collections in the same database. Mongoose. collection('collectionB'). Normally, the database connection uri has the structure like: I am creating a MERN stack application and have chosen to use mongoose to communicate with MongoDB Atlas. There are two options model. render() inside the callba Nov 28, 2015 · Hi is there a way to switch database with mongoose? I thought I could do it like that: mongoose. js application will use Mongoose Framework to connect to MongoDB API on Cosmos DB and create a collection of name Products. mongoose. populate() the "student" path from the WorksnapTimeEntry as a source. Database Deploy a multi-cloud database Search Deliver engaging search experiences Vector Search Design intelligent apps with gen AI Stream Processing Unify data in motion and data at rest Each connection, whether created with mongoose. then( => console. I am using mongoose for mongo db connections in node js. After doing some research, I see that I will most likely need to make use of Apr 14, 2020 · Instead of tables and rows, it uses collections and documents to store data. Example: Apr 8, 2022 · How to fetch data from multiple collections in MongoDB by using a common field and sending data (in those fetched collections) using one response? Employee Scheema: const mongoose = require(&quot; Nov 4, 2022 · I am getting errors while trying to connect multiple databases into nestjs framework. Mongoose acts as an Object Data Modeling (ODM) library, making it easier to structure and interact with MongoDB from Node. log(err)) Then I have created a schema for one of the objects I want to store in the database. 1, I am struggling to find an elegant way for the mongodb q Mar 24, 2025 · The Mongoose Schema API Connection. js module that establishes and manages connections between a Node. js application I get an empty array. collection. Adjust the pool size using your connection options: Aug 24, 2019 · The problem in accessing multiple Database with Mongoose. js by providing a schema-based solution for data validation, querying, and model creation. Let Sep 17, 2018 · Connect and share knowledge within a single location that is structured and easy to search. . The mongoose Mar 16, 2021 · save the project into collection 'project_list' push the uuid of the new project to a client in the collection 'client_list' with transaction enabled, if anything goes wrong (such as the client id is given in the new project JSON object does not exist in the collection 'client_list'), then both step1 and step2 will be canceled. Jul 6, 2024 · Mongoose is a powerful and flexible Node. In the process of migrating my application code to async/await using node v8. I cannot lookup customfieldvalues. js will not allow multiple module instances as it has caching system in require(). connect Mongoose connect to multiple databases. Oct 17, 2024 · To retrieve data from two different collections in MongoDB using Node. const MongoClient = require( 'mongodb' ). var array = [{ type: 'jelly bean' }, { type: 'snicke You can create a mongoUtil. js: import mongoose from &quot;mongoose&quot; ex Dec 30, 2023 · We’ll cover everything from setting up your Mongoose connection to performing queries on your existing data. I am able to connect to them in mongosh using mongosh --host "127. Nov 14, 2022 · With the example I can create a model for each collection, but I can not connect to different databases. options[key] = val. js application: Oct 12, 2017 · my solution is working fine right now but it's taking so much time to iterating data collection for finding ids for metaData collection. Let May 3, 2025 · The Mongoose find() method is one of the most widely used methods for querying MongoDB collections in Node. createConnection(). js to establish the connection I do: mongoose. i have one database with name of Company and in this i have two columns name and DBname and i have multiple Companies databases now i want Jan 22, 2013 · I tried the selected answer but when querying on specific model object, it retrieves data of both schemas. You can connect to MongoDB with the mongoose. At such times the default mongoose single connection no longer meets your needs. env file at root directory of project. When no collection argument is passed, Mongoose produces a collection name by passing the model name to the utils. All the questions and answers I've found have the models and the connection objects in the same file, but in my project they are in different Aug 1, 2024 · The Mongoose Schema API Connection. connect you have to use mongoose. If you don't like this behavior, either pass a collection name or set your schemas collection name option. Issue at hand. connect(DB_CONNECTION_STRING, { useNewUrlParser: true, useUnifiedTopology: true, useCreateIndex: true, useFindAndModify: false}) I'm new to backend development so sorry in advanced if this sounds stupid. However, things get a bit more complex when your application requires connections to multiple databases. Apr 2, 2024 · This method allows us to establish separate connection pools each tailored to a specific use case or data access pattern, unlike the mongoose. But what makes it so versatile — the fact that no schema is required — can also make it more difficult to scale and maintain, particularly in a large, production-grade application. Let Aug 1, 2024 · The Mongoose Schema API Connection. log("Connection established")) . id of the Mongoose API is used on the Connection objects. The question is, how may I join the collection users with the collection usersRole, and Feb 10, 2021 · mongoose only creates collections when first writing an model, and typegoose uses the class name (lower cased) as the model name and mongoose uses the model name as collection name (in plural if not already) if not provided otherwise --- you should maybe set the collection for your Metrics class to something different, because mongodb might use such an collection internally Jan 4, 2021 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Nov 24, 2022 · I have two collections Post (belongs to posts database) and User (belongs to account database). NOTE: mongoose instance will still be pointing to original connected db. Can anyone tell me how can I connect multiple databases in node js. How? I passed the options in the mongoose connect, which I find it a bit more clean: mongoose. passes to MongoDB when creating a new collection. The Node. At times we may need multiple connections open to Mongo, each with different read/write settings, or maybe just to different databases for example. We'll cover the various methods provided by Mongoose for removing documents including removing a single document, removing multiple documents, and removing all documents from a collection. I’m anticipating using some sharding for certain types of data I’m storing, but I’d like to keep other collections unsharded to more easily query the dataset as a whole (using indexes, of course). js, we typically use the Mongoose library or the native MongoDB driver to establish a connection, query both collections and then combine or process the data as needed. This method pluralizes the name. This is where tools like Mongoose and TypeScript come in handy. This approach allows you to query multiple collections in par Aug 1, 2019 · The `mongoose. js module that has functions to both connect to mongo and return a mongo db instance:. Let Apr 26, 2025 · The Mongoose Schema API Connection. asPromise(); Mongoose doesn't allow to use multiple databases in single mongoose instance as the models are build on one connection. js applications, and Mongoose helps you build fast, production-ready applications with Node. Our goal will be to create routes to create both Products and Product and Reviews, as well as ( here comes the join functionality ) a GET request that can retrieve a product along with the associated associated Review. Since your db itself is changing you can't really do anything with a collection of different db. js and mongoose and trying to access an existing collection in MongoDB Atlas named 'questions' inside a database called 'database' i was able to do that using the MongoDB native dr Apr 7, 2022 · Mongoose automatically changes this to the plural form, transforms it to lowercase, and uses that for the database collection name. Populate from two collections. Oct 10, 2020 · Is it possible to save the mongoose injected model to multiple collections? (nestjs inection) I'm looking for something like. Dec 11, 2023 · Overview FYI : I uploaded a complete project to GitHub. I am trying to connect with multiple databases using the mongoose module in nestjs framework. Mongoose allows for a straightforward and schema-based approach to managing MongoDB collections. env. I have this listing collection that has many types. Can someone help? //employees Jun 5, 2021 · Multiple Mongoose Connection Mongoose default connection works for most apps but there are instances when you will want to connect to more than databases in your application. injectedMode. 1 const Blog = mongoose. There's a solution some recommend: using socket. Database Deploy a multi-cloud database Search Deliver engaging search experiences Vector Search Design intelligent apps with gen AI Stream Processing Unify data in motion and data at rest Jun 23, 2024 · Purpose: Establishes a connection to your MongoDB database(s). This can be done by first connecting to the second database and using the callback function to access the requested collection. It allows us to check how many connections does connection object poses. Are you looking to leverage TypeScript’s strong-typing with Mongoose for MongoDB? TypeScript allows for easier development of complex MongoDB-based applications by catching errors at compile-time with static types. ts: instead of mongoose. Feel free to download and see for yourself. The mongoose Feb 13, 2025 · MongoDB is a popular NoSQL database that offers flexibility and scalability, making it an excellent choice for modern applications. connect(). Edit: I want to connect to multiple DBs dynamically. You can access the default connection using mongoose. render() twice. createConnection() Parameters: uri «String»; mongodb URI to connect to [options] «Object» passed down to the MongoDB driver's connect() function, except for 4 mongoose-specific options explained below. May 26, 2020 · If a collection does not exist, MongoDB creates the collection when you first store data for that collection. Nov 7, 2017 · In this example, the localfield and foreignfield have the same id in multiple collections, so you may be achieving the join accidentally. connect does what you asserted. The mongoose Oct 2, 2015 · Currently I have this code for my connection mongoose. My query: If I update an account number in the accounts array in the customer collection, how to update the same account number in the accounts collection. Feb 19, 2020 · Yes you can reference a collection to another collection like the way you're doing, ideally that's how relationships between two collections are maintained in MongoDB, but you need to understand as MongoDB is schema free, there is no direct way to create/update/delete documents in second collection by creating/updating/deleting relative May 7, 2019 · You might handle this with a collection of users and another collection of phone numbers and to get all the phone numbers a user has you’ll need to join the data in both collections together. Had to change 1 thing in model. I can interact with this collection easily through MongoDB's interactive shell; however, when I try to get the collection through Mongoose in an express. Nov 26, 2016 · My understanding on the official documentation is that generally when there is only one connection mongoose. js application and a MongoDB database. insert(docs_array, options, callback_function); method. However, I also have a landing page that caputes leads. save(data); injectedMode. However, with NoSQL databases like MongoDB, joins are not an option, since they are, by definition, not To insert Multiple Documents to MongoDB using Mongoose, use Model. , connection pool size, retry settings). – Aug 14, 2024 · Best practices for using Mongoose with Azure Cosmos DB. Feb 18, 2025 · Creating multiple collections in MongoDB using Mongoose with Node. useDb('userDB'); const postsDb = mongoose. createConnection are all backed by an internal configurable connection pool defaulting to a maximum size of 5. Example: HTML Form for Contact Submission Here’s an example of a simple contact form that interacts with the Node. So I think using discriminator yields better solution: Jun 22, 2021 · I have multiple games where each game has its own set of stats, as you saw on the original post. Jun 25, 2024 · Creating multiple collections in MongoDB using Mongoose with Node. Thanks. createconnection创造所有的内部配置连接池的默认大小为5的支持 。使用您的连接选项调整池大小： 使用您的连接选项调整池大小： Connect and share knowledge within a single location that is structured and easy to search. Equivalent to conn. June 26, 2020. I want to make connection to both Primary (port 27031) and 1 Secondary (port 27032) and in express query either of them depending upon use case. I'm having trouble switching connections and I'm afraid listing the details of my attempts/results would muddy up the question here. Connect to the default db (just like if you were using something like SQL Server) and then take advantage of useDb to target your DML at the appropriate database. js library that simplifies interactions with MongoDB. connect() method that we used previously for the primary MongoDB connection: Nov 27, 2019 · Post above from RalphJS really helped, but it only was using one connection for everything. Let Sep 15, 2023 · Hi, basically I have a replica set with 3 nodes (1 Primary and 2 Secondaries). A merchant signs up and stores his trade info in his account. Click on the "Aggregations" tab in the left sidebar. Supported options include: maxTimeMS: Set maxTimeMS for all queries on this connection. getCollection is not a function. I manage to do the first join with a lookup aggregation but the second one is the problem. 1:27031" -u "m103-admin" -p "m103-pass Jun 25, 2021 · I am new to node. It is used to debug the connection object when we have multiple connections pointing to one single connection reference. Adjust the pool size using your connection options: Dec 27, 2021 · need to add multiple mongoose connection, In our app scenario, We have N number of organization, So every organization need to have separate Database, Is this possible with mongoose? Mar 21, 2024 · To connect MongoDB to a Node. connect或mongoose. When I run my application it starts fine and connects to both DB's successfully however I believe that mongoose is either getting overwritten or something because I might be able to do a findOne() command on primary but secondary fails or vice versa. Sep 19, 2022 · The Mongoose Schema API Connection. *) is to Create a mongoose connection to connect to Mongo's admin database and make sure you have an admin user. JS config/db. Jun 21, 2024 · Creating multiple collections in MongoDB using Mongoose with Node. First, we have to create a schema and reference the f Nov 19, 2017 · I have a node. Each Schema represents a MongoDB collection that will define our models and each key will define a property in our document that will be associated with a type. Same directory where your package. values to employees and customfields to customfield. collection('collectionA'). ts May 7, 2019 · Inside our grocerydb we will have both a collection for Products and a collection for Reviews. Learn more about Teams Mongoose - Query from multiple collections. The mongoose Aug 12, 2019 · I get it now. Prerequisites:Node Dec 14, 2024 · The Mongoose Schema API Connection. connect()` function is the most common way to connect to MongoDB with Mongoose. I am expecting joins on two collections. js + express + mongoose won't accomplish something Each connection, whether created with mongoose. One reason is if you have multiple databases or multiple MongoDB clusters. Hey folks! I have a question about whether it would be wiser to use multiple databases or multiple collections within a single database when designing for applications at scale. 1. The new document will added in the collection as shown in the image 12 Jun 26, 2020 · Join Multiple Collections with Mongoose. My requirements to do join on these two collection. At a high level Dec 16, 2014 · I know in the latest version of Mongoose you can pass multiple documents to the create method, or even better in my case an array of documents. I need to call the save function and there I define what Jun 28, 2011 · Hi, @Shubham Verma, how to get the multiple records from "social" or "address" collections. Here’s a step-by-step guide on how to create and manage multiple collections using Mongoose in a Node Mongoose creates a default connection when you call mongoose. But if your joins have to be on different fields in subsequent collections, this may not work. connect Multiple connections; Connection Pools for waiting until Mongoose creates collections if you use the Jul 22, 2019 · So I have to somehow atomically update multiple collections using MongoDB. getCollection(collection_name) just above the listen part of code but console is saying mongoose. model ( 'Blog' , blog) ; Apr 15, 2024 · In this article, we will explore how to remove documents using Node. connect Mar 19, 2024 · This below code demonstrates how to connect to a MongoDB database using Mongoose in a Node. The data will be posted to the REST API. in the same query. connect or mongoose. I have connected dinners collection to May 14, 2021 · Connect and share knowledge within a single location that is structured and easy to search. insert() [mongodb] which you can use. db. Let 6 days ago · Transactions in Mongoose are managed through sessions. I started using MongoDB for my capstone, as I needed to work with a client. MongoClient Feb 12, 2013 · A very modern approach to get list of all mongo databases using mongoose (version 6. This tutorial describes how to use `mongoose. js I've always used mongoose. Sep 14, 2022 · Hello everyone. create() [mongoose] and model. mongo_connection_string , {useNewUrlParser: true}) . Select the database that contains the collections you want to join. Break models into domain-based collections based on relationships and data that‘s likely to be updated together. I'd like to know if there's another solution, in my case I want to get recipes and authors from 2 different mongoDB collections but I can't do it with only 1 res. For every model you create, Mongoose creates a new collection. This approach allows you to query multiple collections in parallel or in sequence, depending on your Jun 26, 2020 · Join Multiple Collections with Mongoose. You want to . in Other words, if you use Orchestration-based saga, you will need to implement business logic in one of the services, which will start a chain of calls to other services to save data and in case of errors Dec 11, 2024 · First, you write the collection name that you would like to join (movies) into the ‘from’ field, and write the fields of the local collection (genre list) and the fields of the “form collection” (type) in localField and foreignField, respectively, and in as write the output array field (movies). Aug 11, 2021 · For Example: Lets take the sample_analytics database within MongoDB as shown below. It’s responsible for: Specifying the connection URI (uniform resource identifier) of your MongoDB database. Introduction. The client requested that I use MongoDB for this project. Aug 15, 2022 · I am have two clusters and I need to get data from both the clusters Db Collection. Is there any option to perform bulk upserts with mongoose for multiple collections in a single query. js and Mongoose. It optimizes resource utilization, handles connection pooling, and manages errors, facilitating efficient data operations. Connection to Multiple Databases. It also briefly shows a few of the main ways in which you can access model data. Mongoose schemas support Nov 23, 2021 · Connect and share knowledge within a single location that is structured and easy to search. connect()` and how to troubleshoot common issues. Mar 27, 2025 · The Mongoose Schema API Connection. What is Mongoose Connection?A Mongoose co Nov 29, 2019 · How do I set my database and collection using mongoose ? I am trying to connect to a mongodb atlas database using mongoose. I want to join customfield. Here’s a step-by-step guide on how to create and manage m Sets the value of the option key. values. Apr 28, 2025 · This article briefly introduces databases, and how to use them with Node/Express apps. In this video, I have discussed how you can link two collections in MongoDB using Node. Here’s a step-by-step guide on how to create and manage m Apr 1, 2025 · The Mongoose Schema API Connection. providers. Here I show you how to connect multiple mongodb instances in node js using mongoose ,if you have any doubts or clarifications comment belowMy GitHub profile: Jan 27, 2025 · Connection Pooling: Use Mongoose’s built-in connection pooling to manage multiple database connections efficiently. Oct 25, 2023 · npm install @nestjs/mongoose mongoose. const userDb = mongoose. Mongoose Schema Before connecting and configuring our database we are going to create the necessary schemas. 9. cluster 1 - mongoose. Aug 1, 2024 · To retrieve data from two different collections in MongoDB using Node. Schema. Also I don't want multiple models and I have just one project, not various sub-projects. I have two collections, one is for the user data, with firstName, lastName, etc and theres a field called userRole: userRole:{ type: mongoose. toCollectionName method. startSession(); // Using a custom connection const db = await mongoose. Let Aug 7, 2018 · First of all, I will give you a glimpse on our project: We have an application, which has two user roles: Merchant and buyer. Mar 25, 2025 · The Mongoose Schema API Connection. save(data); Sometimes I need to save the model to one collection, and sometimes to another. May 7, 2025 · I want to get access to all the collections of my MongoDB database. js is a tool with which each of your services communicates with the database, and you need to implement the SAGA pattern at the business logic level, this is a higher-level task. Firstly, let's quickly see how you should connect to your MongoDB database in 2020 with Mongoose: mongoose. You may need multiple connections to MongoDB for several reasons. Before accessing a collection, we need to set up Mongoose. I am using mongoose. The connection is done using the connection string. It first imports the Mongoose library and defines the MongoDB connection URI. While using multiple mongoose instances, Node. Getting Started with Transactions If you haven't already, import mongoose: import mongoose from 'mongoose'; Jan 8, 2020 · This issue was resolved by: Put . I have three collections, named employees, customfield. connect() is use, whereas if there is multiple instance of connection mongoose. io. js and Mongoose, a popular MongoDB library that simplifies database interactions. Let Dec 19, 2021 · Please help me out with this as I can't find the answer anywhere. Provide details and share your research! But avoid …. So in my app. You can create a session using either the default Mongoose connection or a custom connection: // Using the default Mongoose connection const session = await mongoose. Mongoose is the most downloaded database framework for Node. js Nov 16, 2018 · So I'm trying to retrieve multiple docs using Mongoose and render them using the HBS view engine. The two solutions I have thought of so far is one collection per game (what I currently have) or a single collection where each document has all the stats for all games. createConnection() to switch db and create your models from that. Let’s expand upon our setup to include connecting to multiple databases. So you have to define your database name at the end of the mongodb connection uri and it will connect to that defined database. 'debug': If true, prints the operations mongoose sends to MongoDB to the console. Sep 1, 2024 · Now you know the basics for integrating Mongoose into your application – let‘s review some best practices when modeling. render(), can't believe node. Here is my code Sep 11, 2024 · I want to store books in a collection called books and users in a collection called users, but I don’t know how to do this in Mongoose. It provides a flexible and powerful way to fetch data from your MongoDB database. For example, a User collection separate from an Orders collection. To use a single collection, you need to use Mongoose Discriminators. 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