How does Query.prototype.all() work in Mongoose ?

Last Updated : 12 Mar, 2021

The Query.prototype.all() specifies an $all query condition. User can specify all values that has to be matched in an array passed as parameter.
Syntax:

Query.prototype.all()

Parameters: This function has two parameter, path and array of values.
Return Value: This function returns Query Object.

Installing mongoose :

npm install mongoose

After installing the mongoose module, you can check your mongoose version in command prompt using the command.

npm mongoose --version

After that, you can just create a folder and add a file for example, index.js as shown below.

Database: The sample database used here is shown below:

Example 1:

index.js

const mongoose = require('mongoose'); 
  
// Database connection 
mongoose.connect('mongodb://127.0.0.1:27017/geeksforgeeks', { 
    useNewUrlParser: true, 
    useCreateIndex: true, 
    useUnifiedTopology: true
}); 
  
// User model 
const User = mongoose.model('User', {  
    name: { type: String }, 
    age: { type: Number } 
}); 
  
User.find().all('name',['Gourav']) 
.exec(function(error, result) { 
    if (error) { 
        console.log(error) 
    } else { 
        console.log(result) 
    } 
}); 

The project structure will look like this:

Run index.js file using below command:

node index.js

Output:

[ { _id: 5ebb9129a99bde77b2efb809, name: ‘Gourav’, age: 10, __v: 0 } ]

Example 2:

index.js

const express = require('express'); 
const mongoose = require('mongoose'); 
const app = express() 
  
// Database connection 
mongoose.connect('mongodb://127.0.0.1:27017/geeksforgeeks', { 
    useNewUrlParser: true, 
    useCreateIndex: true, 
    useUnifiedTopology: true
}); 
  
// User model 
const User = mongoose.model('User', {  
    name: { type: String }, 
    age: { type: Number } 
}); 
  
User.find().all('age', [25]) 
.exec(function(error, result) { 
    if (error) { 
        console.log(error) 
    } else { 
        console.log(result) 
    } 
}); 
  
app.listen(3000, function(error ){ 
    if(error) console.log(error) 
    console.log("Server listening on PORT 3000") 
}) 