Mongoose deep populate multiple. Although this work but we really should .
Mongoose deep populate multiple Learn more about mongoose-deep-populate: package health score, popularity, security, maintenance, versions and more. find (). Populate with TypeScript Mongoose's TypeScript bindings add a generic parameter Paths to the populate(): import { Schema, model, Document, Types } from 'mongoose'; // `Parent` represents the object as it is stored in MongoDB interface Parent { child?: Types. Jul 5, 2023 · Learn more about mongoose-deep-populate: package health score, popularity, security, maintenance, versions and more. Apr 19, 2020 · 🚀 *Mastering MongooseJS: Episode #3 - Unlocking the Power of Population* Embark on a journey of MongoDB excellence with us in this illuminating video where we demystify the concept of . This process substitutes document paths within a document by actual documents from other collections. At least that's true for a single level, so it surely should be the same for anything else. populate('author'), blog posts with the same author will share 1 copy of an author doc. Dec 30, 2023 · This guide will tackle the Mongoose populate method, specifically focusing on how to populate a subdocument after it has already been created, which is a common scenario in building robust MongoDB applications with Node. Enable this option to make Mongoose clone populated docs before assigning them. Populating multiple existing documents If you set perDocumentLimit, Mongoose will ensure correct limit per document by executing a separate query for each document to populate(). 5 support this Project. mongoose populate an array in a model Return certain fields with populate from mongoose condition inner populate mongoose aggregate and populate mongoose mongoose nested populate populate example in mongoose mongoose multiple populate mongoose (populate) mongoose + populate Mongoose populate example mongoose create populate response mongoose Feb 25, 2025 · The populate method in Mongoose is a powerful tool that allows you to dynamically replace references in your documents with the actual referenced documents. js with Mongoose: A Beginner-Friendly Guide When working with MongoDB in a Node. Jan 12, 2014 · In Mongoose, I can use a query populate to populate additional fields after a query. data'). How to populate virtuals to a mongoose model using Node. Aug 28, 2021 · I need a help on mongoose deep population. One of the most powerful features is the populate () method — it helps retrieve referenced documents just like JOINs in SQL. js. In this tutorial, we’ve explored a variety of methods to achieve this, such as using query conditionals, logical operators, custom query helpers, population, and aggregation. Population allows you to include other objects in a specified object. How can I deep populate multiple paths in mongoosejs? Asked 9 years, 3 months ago Modified 9 years, 3 months ago Viewed 829 times I am trying to use Mongoose like a relational db. 128 With the latest version of mongoose (mongoose >= 3. Sep 14, 2019 · I am new to mongoose and I was strugling whole day trying to understand populate. Mongoose plugin to enable deep population of nested models Returns QueryOptions: object contains the following properties: filter which contains the query criteria populate which contains the query population. This article take a deeper dive into Mongoose populate, to help avoid some pitfalls that you may encounter setting this up. js features like async/await and arrow functions. Jun 2, 2021 · Sometimes you want to populate more than one level deep a schema using mongoose. In this blog, we will explore different scenarios of population in NestJS with examples. I want to go through all of them and with my code I've been only able to access only the first 2 layers. Jan 31, 2024 · Mongoose Populate allows a deep search of the referenced document, Let’s take a look at how to populate the name, gender, and email of the staff inside the HR sections property of the jobs schema and leaving others behind as shown below; Feb 12, 2025 · Explore the Mongoose populate method in depth, enhancing your MongoDB queries with effective strategies and essential tips for seamless data retrieval. Jan 24, 2016 · Understanding Mongoose Deep Population 24 January 2016 — Josh Beam — mongodb All Posts While MongoDB doesn’t natively support joins, the Mongoose framework now supports “deep population” (Mongoose has supported single-level populations for a while), which is akin to passing Mongoose a “graph” of what data should be populated in the results of your query. Dec 22, 2022 · Product Model: { department: { type: mongoose. Virtual fields, unlike regular fields, do not get stored in the database. What is Population in Mongoose? Use the populate option to supply paths with corresponding Mongoose populate options. Jul 7, 2025 · In this deep dive, we’ll explore how population works, the various methods and options available, hooks, and how to debug and profile population queries. Dec 11, 2021 · #3 Or to use deep-populate if you're populating across multiple levels as documented here: Nov 27, 2014 · Mongoose: How to populate 2 level deep population without populating fields of first level? in mongodb Asked 10 years, 5 months ago Modified 6 years, 4 months ago Viewed 9k times 128 With the latest version of mongoose (mongoose >= 3. It is especially useful when you're populating multiple documents. Who is this post for Mongoose 4. Populate in MongoDB simplifies data access and manipulation by automatically resolving references and populating the specified fields with the relevant documents. In this article, we will explore Mongoose Populate Virtuals, a powerful feature that allows us to populate virtual Nov 18, 2024 · Motivation reference population is a commonplace in web development traditional MongoDB ODMs use a “query each one of the references then build the final object using JS” approach it is possible to deep populate references sending a single aggregation pipeline payload to the MongoDB server Methods Github CI runner was used for each test Used MongoDB version was 8. Please see Mongoose Deep Populate for more details select which contains the query projection lean which contains the definition of the query Sep 14, 2019 · Hello @heyomi ! According to this Populating across multiple levels documentation from Mongoose. Being 'cars houses' as the space delimited list of paths in the current level. ObjectId, ref: To populate multiple levels of related documents in Mongoose, you can chain multiple calls to the populate () method in a query chain. Please see Mongoose Deep Populate for more details select which contains the query projection lean which contains the definition of the query records format sort, skip, limit, which contains the cursor modifiers for paging purpose filter which contains the query criteria populate which contains the query population. This article guides you through the concept of population in Mongoose, providing clear examples to illustrate this powerful feature effectively. The populate () method allows you to replace a field or object of one collection with any other document or document’s field from another collection based on the reference field. Refer to changelogfor breaking changes. It makes the process a lot easier and more automatic. Please see Mongoose Deep Populate for more details select which contains the query projection lean which contains the definition of the query If you set perDocumentLimit, Mongoose will ensure correct limit per document by executing a separate query for each document to populate(). 6), you can but it requires a second query, and using populate differently. ObjectId, ref:'Order' }] The orders schema has an array of products: contents:[{ By default, passing multiple paths to populate() in the middleware will trigger an infinite recursion, which means that it will basically trigger the same middleware for all of the paths provided to the populate() method - For example, this. js application using Mongoose, data is often spread across multiple collections. Learn how to perform double population with `Mongoose` on nested levels effectively in your MongoDB queries. find() . populate({ path: 'pages', populate: { path: 'components', model: 'Component' } }) . Setting Up NestJS with MongoDB Before diving into population, let’s set up a NestJS project Feb 22, 2016 · Deep (multiple level) populate returns null if reference schema is not one of the parent schemas. Jun 27, 2020 · I have an users collection which has an orders key: orders:[{ type:mongoose. clone=false] «boolean» When you do BlogPost. How Mongoose populate () Works References: Replaces ObjectId fields with actual documents from the Mongoose deep populate Quick and dirty replacement for mongoose-deep-populate plugin that is not maintained anymore. Jul 13, 2024 · Multiple Documents: When dealing with arrays of references, Mongoose can populate each reference in the array, thus handling complex data structures efficiently. populate({ path: 'test', perDocumentLimit: 2 }) will execute 2 additional queries if . By using nested population, you can simplify your database queries and reduce the number of round trips to the database. Setting Up Mongoose and Using Populate Before you can use populate, you need to define relationships between If you specify a transform function, Mongoose will call this function on every populated document in the result with two arguments: the populated document, and the original id used to populate the document. const ItemSchema Jan 18, 2016 · buunguyen commented on Jan 18, 2016 You can use the match option of Mongoose populate (see this. Just as the name suggests, data will often mimic real-world documents. Support Mongoose 3. populate ('doctorids') should populate the array of Doctors and the array of Doctors in turn should populate the Users each Doctor points to. Mongoose plugin to enable population of nested models at any level of depth. Sep 1, 2017 · Surely that's just Users. Jul 15, 2017 · If you already push the new chairs and targets into the Transport model, you can populate it better with the mongoose-deep-populate module, here is a simple example of how config to set it up. Populating multiple existing documents [options. Use the populate option to supply paths with corresponding Mongoose populate options. You can send this Object to Deep Populate your data. Populate options can be specified via the plugin options. After your aggregation, do this: A free, fast, and reliable CDN for hata-mongoose-deep-populate. Mongoose plugin to enable deep population of nested models A modification of mongoose-deep-populate plugin for working with multiple databases. xand later. MongoDb isn't mongoose-Deep-Populate POC for a util function to be used on Mongoose Schemas that allow for deep level population - on unknown amount of levels of subdocument referencing. const childSchema = new mongoose. 5. First Sep 16, 2021 · I am working with documents whose schemas contain multiple fields with a certain name (let’s call it “fieldOfInterest”), and I would like to make a list of the values of all “fieldOfInterest” fields within a given document (and eventually, query the collection of documents itself to get the list of all “fieldOfInterest” values for that collection). can nest populate to get the child association object of the associated object Oct 28, 2016 · Mongoose now supports deep population which should solve your problem. Apr 21, 2018 · Using the populate output, you can then simply manipulate the data in result just like any other data structure, as long as you apply . subject. ObjectId, r Nov 13, 2024 · What is Nested Population? Nested population in Mongoose allows you to populate nested documents within a document. Nov 27, 2018 · Mongoose native populate function is great, but sometimes we want every field to be auto-populated… and it’s not cool to call the populate method a lot of times with different arguments. In your example. mongoose populate deep Jun 16, 2021 · So, I had a mongoose schema that referenced multiple collections. Jun 2, 2015 · The mongoose-deep-populate plugin will work for this, but you need to use the right path to the deepest field you want populated. 8. Apr 21, 2024 · Populate in Mongoose is helpful when selecting related data from multiple collections and combining it into a single document. find({}) . Jun 5, 2025 · Populate () in Node. It makes working with related data easier by fetching linked documents in a single query, eliminating the need to manually query multiple collections. This method is invaluable when you want to retrieve related data from different collections in a single query. How do I deep populate multiple Client 's fields in the single . Mongoose plugin to enable deep population of nested models. Start using @geekbears/gb-mongoose-query-parser in your project by running `npm i @geekbears/gb-mongoose-query-parser`. 0, last published: 3 years ago. find(query) . Before 3. find() returns 2 documents. populate ( { path : 'users', populate: [ { path: 'cars' }, { path : 'houses', populate: { path : 'rooms', populate: 'windows' } } ] }); Popularity 8/10 Helpfulness 6/10 Language javascript Source: stackoverflow. However, these fields are Feb 2, 2024 · Need of Populate in MongoDB The populate in MongoDB, particularly in the Mongoose library, serves a crucial role in resolving relationships and enhancing data retrieval efficiency. I managed to do simple examples but now I created two schemas: First which is UserSchema with some user details: Contribute to harshad1011/hata-mongoose-deep-populate development by creating an account on GitHub. Use this online mongoose-deep-populate playground to view and fork mongoose-deep-populate example apps and templates on CodeSandbox. exec(function(err, docs) {}); And you can join more than one deep level. Visit Snyk Advisor to see a full health score report for hata-mongoose-deep-populate, including popularity, security, maintenance & community analysis. 6 supports the document#populate () method. This plugin makes it very simple to populate nested models at any level of depth. js ? The 4. Dec 31, 2023 · Before diving into nested arrays, it’s essential to grasp the population concept in Mongoose. 3 (latest) Documents Please see Mongoose Deep Populate for more details select which contains the query projection lean which contains the definition of the query records format sort, skip, limit, which contains the cursor modifiers for paging purpose filter which contains the query criteria populate which contains the query population. Sep 18, 2013 · Firstly, update mongoose 3 to 4 & then use the simplest way for deep population in mongoose as shown below: Suppose you have Blog schema having userId as ref Id & then in User you have some review as ref Id for schema Review. Car . Mar 28, 2025 · Mongoose Populate Virtuals refers to the ability to use the populate() method to populate virtual fields in your Mongoose models. 1, last published: 2 months ago. find Sep 4, 2023 · How to use Populate in Mongoose & Node. ObjectId, ref If we have an existing mongoose document and want to populate some of its paths, mongoose >= 3. Instead, they are computed on the fly based on other document data. Please see Mongoose Populate for more details deepPopulate which contains the query population Oobject. You need to specify the populate paths once as an array. A modification of mongoose-deep-populate plugin for working with multiple databases. g. MongoDB uses references (ObjectIds) to link documents, and Mongoose provides population to resolve these references. Basically, I have an ItemGroupSchema having a _id referenced to ItemSchema and items being an array of references to ItemSchema as well. This gives you more control over the result of the populate() execution. ObjectId, ref: "Department", required: true, }, category: { type: mongoose. Document Design Document databases provide a lot of flexibility in how data is modeled. mongoose deep populate Comment 1 Manager. Sends multiple insertOne, updateOne, updateMany, replaceOne, deleteOne, and/or deleteMany operations to the MongoDB server in one command. 2 package - Last release 3. populate('followers following') will trigger the same middleware for both followers and following fields Feb 27, 2019 · I have the following structure and I need to populate the reference in multiple level in mongoose. Check out either Mongoose Deep Populate plugin or you can take a look at how Mongoose populates across multiple levels. Usage setup Extend Mongoose 4+ population with virtual attributes that can be populated in either direction. 5 support something like below. Mongoose will perform casting on all operations you Jun 14, 2023 · When to use find () vs aggregate $lookup vs populate () in Mongoose and MongoDB find (), $lookup, and populate () were benchmarked to test their performance Here is the schema I used in the … [options. You should be able to pass something like this to your populate (hard to say exactly without seeing the models): Mar 26, 2019 · I've got blog model which has multiple comments which have multiple replies. While Mongoose 4. Returns QueryOptions: object contains the following properties: filter which contains the query criteria populate which contains the query population. 2. Mar 12, 2016 · 23 I dont know why it even accepted multiple populate keys in the object, it is already duplicated, what you specified to populate is: populate: { path: 'b', model: B }, populate: { path: 'c', model: C }, here the property populate gets duplicated, and only the last one defined is considered. Dec 30, 2023 · With the reference in place, you can now use Mongoose’s populate() method to fill in the details of the linked user when querying posts: async function getPostWithAuthor (postId) { How to populate nested objects asynchronously in mongoose? mongoose mongoose-populate Apr 23, 2016 at 18:56 Aug 31, 2022 · I'm trying to populate across multiple levels using the following fields firstly from an Article model: comments: [ { type: Schema. It provides a straightforward, schema-based solution to model … Check @epicfaace/mongoose-deep-populate 3. In this case, the query should look like this: Parent. populate({ path: 'partIds', model: 'Part', populate: { // First Populate path: 'otherIds', model: 'Other' } populate: { // Second Populate path: 'ModelIds', model: 'Model' } }) So, basically, I want to do double populate in one nested level. Please see Mongoose Populate for more detailsdeepPopulate which contains the query population Oobject. Although this work but we really should And Car and House as well (their structure is not important for the matter. We may populate a single document, multiple documents, a plain object, multiple plain objects, or all objects returned from a query. I have found many examples for populating one schema with another, bu We may populate a single document, multiple documents, a plain object, multiple plain objects, or all objects returned from a query. js While working on a MERN stack project, I came across a situation where I wanted to populate a field but also populate a field inside that populated field (I … Sep 7, 2020 · You can chain populate method for populating multiple fields. populate () call? What have I tried: I have schema for product categories with subcategories, I need to populate on multi-level on subcategories. 6 you must execute the populate() method multiple times. For example, . lean() to the query to convert or otherwise extract the plain object data from the mongoose documents returned. Latest version: 3. Please see Mongoose Deep Populate for more detailsselect which contains the query projectionlean which contains the definition of the query records formatsort, skip, limit, which contains the cursor modifiers for paging purpose Please see Mongoose Deep Populate for more details select which contains the query projection lean which contains the definition of the query records format sort, skip, limit, which contains the cursor modifiers for paging purpose filter which contains the query criteria populate which contains the query population. There are 61 other projects in the npm registry using mongoose-deep-populate. Oct 10, 2025 · The populate () method in Mongoose automatically replaces a referenced field (ObjectId) with the actual document from another collection. Uses the multiple level population introduced in Mongoose > 4 (?). Dec 21, 2016 · It should have worked for both, i dont know about multiple populate inside a populate though, That may have caused the issue, Otherwise it should have worked. Jun 18, 2013 · Mongoose is an object modeler for MongoDb. Quick and dirty replacement for mongoose-deep-populate plugin that is not maintained anymore. I can also populate multiple paths, such as Person. [options. Population is the process of automatically replacing the specified paths in the document with document (s) from other collection (s). Start using mongoose-deep-populate in your project by running `npm i mongoose-deep-populate`. Sep 24, 2021 · What I'm actually wondering is how does Mongoose execute the population behind the scenes for multiple paths? When I chain them in plain JavaScript, does it use a single query to the database or does it query the database separately for each path? Jul 23, 2025 · Mongoose is a powerful Object Data Modeling (ODM) library for MongoDB and Node. We need an example to work with !! We are going to create 3 collections with 3 schemas: User Blog Comment By default, Mongoose only supports populating nested models at one level of depth. The Solution The key to successfully populating fields in Mongoose is to use nested populate methods, especially when you want to populate data from multiple related collections in one query. First things first. find () . Latest version: 1. If you're working with MongoDB and I think code example will much better than English explanation of problem. Schema. 3. In mongoose >= 3. I have a task schema that needs to reference client, user and note schemas. Schema({ name: String, age: { type: Number, default: 0 } }); const subdocumentSchema = new mongoose. Sep 11, 2019 · Mongoose population can be tricky to setup. 6, we can pass a space delimited string of path names to populate. exec(function(err, parents) {}); However, it's important to realize this uses multiple queries (at least one per population level) to perform the population. If you specify a transform function, Mongoose will call this function on every populated document in the result with two arguments: the populated document, and the original id used to populate the document. Let's look at some examples. One of its most useful features is the populate() method, which allows us to efficiently fetch related documents from other collections, providing a powerful way to link and display data in a more readable and structured form. Please see Mongoose Deep Populate for more details select which contains the query projection lean which contains the definition of the query Dec 30, 2023 · This tutorial provides an in-depth guide on how to use Mongoose queries after the populate() function, implementing basic to advanced examples utilizing the latest JavaScript and Node. If we have an existing mongoose document and want to populate some of its paths, mongoose >= 3. 1. For Example i have parent category "Mens Clothing" with subcategory "T-shirts" with sub "Graphic T-shirts" and so on. There are no other projects in the npm Mongoose plugin to enable deep population of nested models ⛺ - buunguyen/mongoose-deep-populate Mongoose plugin to enable deep population of nested models ⛺ - buunguyen/mongoose-deep-populate Dec 30, 2023 · The ability to filter documents by multiple fields in Mongoose is essential for building sophisticated data-driven applications. 2 with MIT licence at our NPM packages aggregator and search engine. Mar 2, 2016 · I've searched high and low but can't figure out how to form the following populate query, first here are my models: const CourseSchema = new Schema({ classes: [{ type: Schema. After your aggregation, do this: Nov 27, 2014 · Mongoose: How to populate 2 level deep population without populating fields of first level? in mongodb Asked 10 years, 5 months ago Modified 6 years, 4 months ago Viewed 9k times Returns QueryOptions: object contains the following properties: filter which contains the query criteria populate which contains the query population. i will share with you today how i use pure mongoose populate method to access more than one level deep data relation. mongoose populate aggregation population join mongoose-deep-populate mongoose-reverse-populate mongoose-power-populate Nested Mongoose Populate: How do I implement a nested mongoose populate on Appointments. It has a particularly great feature, called population. I am not sure if it is going to help you but worth trying. deepPopulate('childs. #3904 Closed JasonCust opened this issue on Feb 22, 2016 · 4 comments Convert url query string to MongooseJs friendly query object including advanced filtering, sorting, population, deep population, string template, type casting and many more. populate({ path: 'users', populate: { path: 'cars houses' } }). This is faster than sending multiple independent operations (e. 5 seems to allow populate on a populated document. populate Contribute to harshad1011/hata-mongoose-deep-populate development by creating an account on GitHub. Oct 7, 2025 · The populate () method in Mongoose is used to replace references stored as ObjectId in your MongoDB documents with the actual documents they reference from another collection. Schema({ child: { [options. Apr 4, 2025 · When working with MongoDB and NestJS, relationships between collections are often necessary. js and Mongoose. findOne(). 5 version of mongoose supports deep-populate, which is deep association acquisition. Oct 25, 2025 · Mongoose gives us tools to manage these relationships cleanly. Edit 03/17/2021: This is the library's implementation, what it do behind the scene is make another query to fetch thing for you and then join in memory. This means that you can fetch data from multiple collections that are related in a hierarchical structure. Dec 30, 2023 · Mongoose is a robust tool for managing data relations in MongoDB. I wanted a situation where I could populate the schema from these collections depending on the property value in the document. 0. You can even provide an array of multiple fields to populate on the populated document Mongoose has a more powerful alternative called populate () , which lets you reference documents in other collections. if you use create()) because with bulkWrite() there is only one round trip to MongoDB. ---This video is based on the question https://st Sep 20, 2016 · Yes you can. populate('books movie', 'title pages director') Jul 2, 2024 · Advanced Techniques for Filtering Data with Mongoose Mongoose is a powerful ODM (Object Data Modeling) library for MongoDB and Node. Mongoose applies defaults recursively, which means there's a nice workaround if you want to make sure Mongoose applies subdocument defaults: make the subdocument path default to an empty object. In this article, we will explain how the populate() method works, its syntax, and Oct 25, 2025 · Mongoose gives us tools to manage these relationships cleanly. find(). If two populate methods, populate same field, second populate overrides the first one. com Tags: javascript mongoose populate Share Link to this answer Share Copy Link Contributed on Aug 09 2022 Akmal Shareef 0 Answers Avg What happens when you execute the find query in mongodb terminal, do you receive the records? If yes then you can try converting the request to ObjectId in your find query. ObjectId, name?: string } const ParentModel = model<Parent>('Parent', new Schema({ Created on 8 Nov 2011 · 93Comments · Source: Automattic/mongoose Hey, I have the following schemas ( simplified for issue) User = new Schema login:String A = new Schema emb: [B] comments: [Comments] //and following embedded schemas B = new Schema comments: [Comments] Comments = new Schema creator: type: ObjectId ref: 'User' message: String Now while populate works on A eg A. For example, a [options. Types. This is in my Mongoose v5. find () in a way that Appointments. foxzueszzrngbahvlmdbmuwmafjcrnwihieprxgijtxgjapnseczbzmlkvurqxllfxqxaogftyytxxlj