how to use mongoose populate

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Clean Cowfish answered on March 1, 2021 Popularity 10/10 Helpfulness 1/10

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how to use mongoose populate

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{  _id: 59ab1c92ea84486fb4ba9f28,  username: JD,  posts: [    "59ab1b43ea84486fb4ba9ef0",    "59ab1b43ea84486fb4ba9ef1"  ]}

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Contributed on Mar 01 2021

Clean Cowfish

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populate example in mongoose

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const Live = new Schema(
  {
    user_id:{ 		// this one populate
            type: Schema.Types.ObjectId,      
            ref: 'User',    //  User Schema
            required: true                 
        },
        title: {
            type: String,
        },
        category:{        // this one populate
            type: Schema.Types.ObjectId,
            ref: 'Category'  // Category Schema
        },
  }
)
let vid = await Live.find({})
            .populate({path:'user_id',select:'name image -_id'})
            .populate({path:'category',select:'category -_id',model:Category})

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Tags: javascript j

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Contributed on Jan 11 2022

Angry Albatross

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mongoose (populate)

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// The 2nd `populate()` call below overwrites the first because they
// both populate 'fans'.
Story.
  find().
  populate({ path: 'fans', select: 'name' }).
  populate({ path: 'fans', select: 'email' });
// The above is equivalent to:
Story.find().populate({ path: 'fans', select: 'email' });

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Source: mongoosejs.com

Tags: javascript j

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Contributed on Nov 16 2021

Angry Albatross

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Mongoose populate example

Comment

const members = await subtable.find({ party: req.body.party }).populate({
    path: "user_id", //subtable field which refers to your main table
    select: "fname lname",
  });

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Source: Grepper

Tags: javascript j

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Contributed on Jul 15 2022

Dhaval Italiya

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mongoose + populate

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app.get('/movies', passport.authenticate('jwt', { session: false }), (req, res) => {
	Movies.find()
		.populate('Genre')
		.populate('Actor')
		.populate('Director')
		.then((movies) => {
			res.status(201).json(movies);
		})
		.catch((err) => {
			console.error(err);
			res.status(500).send(`Error: ${err}`);
		});
});

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Source: stackoverflow.com

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Contributed on May 12 2022

Quaint Quelea

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mongoose populate()

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// populates a single object
User.findById(id, function (err, user) {
  const opts = [
    { path: 'company', match: { x: 1 }, select: 'name' },
    { path: 'notes', options: { limit: 10 }, model: 'override' }
  ];

  User.populate(user, opts, function (err, user) {
    console.log(user);
  });
});

// populates an array of objects
User.find(match, function (err, users) {
  const opts = [{ path: 'company', match: { x: 1 }, select: 'name' }];

  const promise = User.populate(users, opts);
  promise.then(console.log).end();
})

// imagine a Weapon model exists with two saved documents:
//   { _id: 389, name: 'whip' }
//   { _id: 8921, name: 'boomerang' }
// and this schema:
// new Schema({
//   name: String,
//   weapon: { type: ObjectId, ref: 'Weapon' }
// });

const user = { name: 'Indiana Jones', weapon: 389 };
Weapon.populate(user, { path: 'weapon', model: 'Weapon' }, function (err, user) {
  console.log(user.weapon.name); // whip
})

// populate many plain objects
const users = [{ name: 'Indiana Jones', weapon: 389 }]
users.push({ name: 'Batman', weapon: 8921 })
Weapon.populate(users, { path: 'weapon' }, function (err, users) {
  users.forEach(function (user) {
    console.log('%s uses a %s', users.name, user.weapon.name)
    // Indiana Jones uses a whip
    // Batman uses a boomerang
  });
});
// Note that we didn't need to specify the Weapon model because
// it is in the schema's ref

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Source: mongoosejs.com

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Contributed on Apr 22 2021

Blue Beaver

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what does populate in mongoose mean?

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"Mongoose populate() lets you reference documents in other collections.
Population is the process of automatically replacing the specified 
paths in the document with document(s) from other collection(s)."

Source: https://mongoosejs.com/docs/populate.html

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Source: mongoosejs.com

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Contributed on Sep 01 2022

KostasX

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populate in mongoose

Comment

const mongoose = require('mongoose');
const { Schema } = mongoose;

const personSchema = Schema({
  _id: Schema.Types.ObjectId,
  name: String,
  age: Number,
  stories: [{ type: Schema.Types.ObjectId, ref: 'Story' }]
});

const storySchema = Schema({
  author: { type: Schema.Types.ObjectId, ref: 'Person' },
  title: String,
  fans: [{ type: Schema.Types.ObjectId, ref: 'Person' }]
});

const Story = mongoose.model('Story', storySchema);
const Person = mongoose.model('Person', personSchema);

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Source: mongoosejs.com

Tags: javascript j

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Contributed on Jun 13 2022

Sonia Sonia

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is populate a mongoose method or mongo mongodb method

Comment

Populate. MongoDB has the join-like $lookup aggregation operator 
in versions >= 3.2. Mongoose has a more powerful alternative 
called populate() , which lets you reference documents in other 
collections.

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Source: Grepper

Tags: mongodb mongoose populate whatever

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Contributed on Sep 04 2022

Omar Bahutair

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how to use mongoose populate

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populate example in mongoose

mongoose (populate)

Mongoose populate example

mongoose + populate

mongoose populate()

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populate in mongoose

is populate a mongoose method or mongo mongodb method

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