MongoDB_Data_Population_Reference.txt

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

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

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

 const Person = mongoose.model('Person', personSchema);
 const Story = mongoose.model('Story', storySchema);
 module.exports = {Person, Story}


 const author = new Person({
     _id: new mongoose.Types.ObjectId(),
     name: 'Darpan Chachpara',
     age: 24,
     gender: "Male",
     contact: 75868,
     email: "darpan@gmail.com",
     stories: "Robbery"
   });
   author.save(function (err) {
     if (err) return handleError(err);


     const story1 = new Story({
       title: 'Money Heist',
       author: author._id,    // assign the _id from the person
       fans: "Dc_126_111"
     });
     story1.save(function (err) {
       if (err) return handleError(err);
       // that's it!
     });
   });


   Story.
   findOne({ title: 'Money Heist' }).
   populate('author').
   exec(function (err, story) {
     if (err) return handleError(err);
     console.log('The author is %s', story.author.name);
     // prints "The author is Darpan Chachpara"
   });