Mongoose where() , equals(), gt, lt, gte, lte, in, all, nin Operators #projection select() #Difficulty Hard #Challange

1) This is a Mongoose code where you can use where() with find(), equals(), gt(), lt(), gte(), lte() and for arrays in([]), all([]), nin([]) all the operators.

2)with the help of where() clause you can write a nested and complex query as per your need.

3) Follow my github account to get to learn about mongoose with various other concepts and also javascript, express.js ....

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const mongoose = require('mongoose');

main().catch(err => console.log(err));

async function main() {
  await mongoose.connect('mongodb://127.0.0.1:27017/StudentData');

  const studentSchema = new mongoose.Schema({
    name: {
        first : String,
        last : String,
    },
    email : String,
    address : {
        state : String,
        district : String,
        city : String,
    },
    science : {
        physics : Number,
        chemistry : Number,
        mathematics : Number,
    },
    hobbies : [String],
  });

  const Student = mongoose.model('Student', studentSchema);

   await Student.insertMany([
    { 
        name : {
            first : "Mayuk",
            last : "Mukherjee",
        },
        email : "[e-mail]",
        address : {
            state : "California",
            district : "Atlanta",
            city : "Georgia",
        },
        science : {
            physics : 99,
            chemistry : 88,
            mathematics : 97,
        },
        hobbies : ["sports", "singing", "dancing", "painting"],
    },
    { 
        name : {
            first : "Suryendu",
            last : "Sarkar",
        },
        email : "[e-mail]",
        address : {
            state : "Texas",
            district : "Atlanta",
            city : "Denver",
        },
        science : {
            physics : 74,
            chemistry : 82,
            mathematics : 86,
        },
        hobbies : ["reading", "singing", "blogging", "sculpting"],
    },
    { 
        name : {
            first : "Aninda",
            last : "Mukherjee",
        },
        email : "[e-mail]",
        address : {
            state : "Massachuttes",
            district : "Atlanta",
            city : "Georgia",
        },
        science : {
            physics : 82,
            chemistry : 94,
            mathematics : 75,
        },
        hobbies : ["painting", "travelling", "sports", "judo"],
    },
    { 
        name : {
            first : "Sanlap",
            last : "Gadai",
        },
        email : "[e-mail]",
        address : {
            state : "Alabama",
            district : "Oklohama",
            city : "Atlanta",
        },
        science : {
            physics : 85,
            chemistry : 66,
            mathematics : 79,
        },
        hobbies : ["coocking", "drawing", "sports", "gymming"],
    },
   ]);

   const allStudent = await Student.find({});
   console.log(allStudent);

    const result1 = await Student.find({ 'name.first' : "Mayuk", 'name.last' : "Mukherjee", 'address.state' : "California" }).
    where('address.district').equals('Atlanta').where('address.city').equals('Georgia').where('science.physics').gt(90).lte(100).
    select({ name: 1, "address.state" : 1, "address.district" : 1, "address.city" : 1, science : 1, hobbies : 1 });

    console.log(result1);

    const result2 = await Student.find({ 'address.state' : /Texas/i, 'address.district' : /Atlanta/i, 'science.chemistry' : {$gt : 75, $lte : 85},
    hobbies : {$in : ["travelling", "judo", "blogging", "reading"]}}).where('address.city').equals('Denver').
    where('name.last').equals('Sarkar').where('science.mathematics').gt(85).lte(90).
    select({ 'name.first' : 1, 'name.last' : 1, address : 1, 'science.physics' : 1, 'science.chemistry' : 1, 'science.mathematics' : 1, hobbies : 1})

    console.log(result2);

   const result3 = await Student.find({ "name.first" : /Aninda/i , "name.last" : /Mukherjee/i, email : '[e-mail]'}).
                   where('address.state').equals('Massachuttes').
                   where('address.district').equals('Atlanta').
                   where('address.city').equals('Georgia').
                   where('science.physics').gte(80).lt(85).
                   where('science.chemistry').gt(85).lte(95).
                   where('science.mathematics').gte(70).lte(75).
                   where('hobbies').all([ 'painting', 'travelling', 'sports', 'judo' ]).
                   select({ name : 1, 'address.state' : 1, 'address.district' : 1, 'science.physics' : 1, 'science.mathematics' : 1, hobbies : 1})
    console.log(result3);

    const result4 = await Student.find({ 'address.state' : 'Alabama', 'address.district' : 'Oklohama', 'address.city' : 'Atlanta'}).
                    where('name.first').equals('Sanlap').
                    where('address.district').equals('Oklohama').
                    where('address.city').equals('Atlanta').
                    where('science.physics').gte(80).lt(90).
                    where('science.mathematics').gt(75).lte(80).
                    where('hobbies').nin(['painting','travelling','blogging','dancing']).
                    select({ 'name.first' : 1, address : 1, 'science.physics' : 1, 'science.chemistry' : 1, hobbies : 1})

     console.log(result4); 

    const result5 = await Student.find({ }).where('hobbies').in(['sculpting','gymming']).
                    select({ name : 1, 'address.state' : 1, 'address.city' : 1, 'science.chemistry' : 1, hobbies : 1 })

     console.log(result5);

    const result6 = await Student.find({ }).where('hobbies').all(['travelling','sports','judo']).
                    select({ 'name.last' : 1 , 'address.district' : 1, science : 1, hobbies : 1 });
     console.log(result6);

    const result7 = await Student.find({ }).where('hobbies').nin(['painting','travelling','reading','blogging']).
    select({ name : 1 , 'address.district' : 1, 'science.physics' : 1, 'science.mathematics' : 1, hobbies : 1 })

    console.log(result7);
}

Check the output here :

 PS C:\Users\USER\Downloads\mongoExpress\Queries_find_where> node src/find_where_1.js
[
  {
    name: { first: 'Mayuk', last: 'Mukherjee' },
    address: { state: 'California', district: 'Atlanta', city: 'Georgia' },
    science: { physics: 99, chemistry: 88, mathematics: 97 },
    _id: new ObjectId('65c51a8df91b7f43aee89902'),
    email: '[e-mail]',
    hobbies: [ 'sports', 'singing', 'dancing', 'painting' ],
    __v: 0
  },
  {
    name: { first: 'Suryendu', last: 'Sarkar' },
    address: { state: 'Texas', district: 'Atlanta', city: 'Denver' },
    science: { physics: 74, chemistry: 82, mathematics: 86 },
    _id: new ObjectId('65c51a8df91b7f43aee89903'),
    email: '[e-mail]',
    hobbies: [ 'reading', 'singing', 'blogging', 'sculpting' ],
    __v: 0
  },
  {
    name: { first: 'Aninda', last: 'Mukherjee' },
    address: { state: 'Massachuttes', district: 'Atlanta', city: 'Georgia' },
    science: { physics: 82, chemistry: 94, mathematics: 75 },
    _id: new ObjectId('65c51a8df91b7f43aee89904'),
    email: '[e-mail]',
    hobbies: [ 'painting', 'travelling', 'sports', 'judo' ],
    __v: 0
  },
  {
    name: { first: 'Sanlap', last: 'Gadai' },
    address: { state: 'Alabama', district: 'Oklohama', city: 'Atlanta' },
    science: { physics: 85, chemistry: 66, mathematics: 79 },
    _id: new ObjectId('65c51a8df91b7f43aee89905'),
    email: '[e-mail]',
    hobbies: [ 'coocking', 'drawing', 'sports', 'gymming' ],
    __v: 0
  }
]
[
  {
    name: { first: 'Mayuk', last: 'Mukherjee' },
    address: { state: 'California', district: 'Atlanta', city: 'Georgia' },
    science: { physics: 99, chemistry: 88, mathematics: 97 },
    _id: new ObjectId('65c51a8df91b7f43aee89902'),
    hobbies: [ 'sports', 'singing', 'dancing', 'painting' ]
  }
]
[
  {
    name: { first: 'Suryendu', last: 'Sarkar' },
    address: { state: 'Texas', district: 'Atlanta', city: 'Denver' },
    science: { physics: 74, chemistry: 82, mathematics: 86 },
    _id: new ObjectId('65c51a8df91b7f43aee89903'),
    hobbies: [ 'reading', 'singing', 'blogging', 'sculpting' ]
  }
]
[
  {
    name: { first: 'Aninda', last: 'Mukherjee' },
    address: { state: 'Massachuttes', district: 'Atlanta' },
    science: { physics: 82, mathematics: 75 },
    _id: new ObjectId('65c51a8df91b7f43aee89904'),
    hobbies: [ 'painting', 'travelling', 'sports', 'judo' ]
  }
]
[
  {
    name: { first: 'Sanlap' },
    address: { state: 'Alabama', district: 'Oklohama', city: 'Atlanta' },
    science: { physics: 85, chemistry: 66 },
    _id: new ObjectId('65c51a8df91b7f43aee89905'),
    hobbies: [ 'coocking', 'drawing', 'sports', 'gymming' ]
  }
]
[
  {
    name: { first: 'Suryendu', last: 'Sarkar' },
    address: { state: 'Texas', city: 'Denver' },
    science: { chemistry: 82 },
    _id: new ObjectId('65c51a8df91b7f43aee89903'),
    hobbies: [ 'reading', 'singing', 'blogging', 'sculpting' ]
  },
  {
    name: { first: 'Sanlap', last: 'Gadai' },
    address: { state: 'Alabama', city: 'Atlanta' },
    science: { chemistry: 66 },
    _id: new ObjectId('65c51a8df91b7f43aee89905'),
    hobbies: [ 'coocking', 'drawing', 'sports', 'gymming' ]
  }
]
[
  {
    name: { last: 'Mukherjee' },
    address: { district: 'Atlanta' },
    science: { physics: 82, chemistry: 94, mathematics: 75 },
    _id: new ObjectId('65c51a8df91b7f43aee89904'),
    hobbies: [ 'painting', 'travelling', 'sports', 'judo' ]
  }
]
[
  {
    name: { first: 'Sanlap', last: 'Gadai' },
    address: { district: 'Oklohama' },
    science: { physics: 85, mathematics: 79 },
    _id: new ObjectId('65c51a8df91b7f43aee89905'),
    hobbies: [ 'coocking', 'drawing', 'sports', 'gymming' ]
  }
]

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[swapnanilWebDeveloper]

If any new bees find it difficult please don't hesitate to contact me. To reach out for simple explanation and better understanding please comment on this post or message me . It will be great to help you guys to become a pro dev.