Updating Embeded Documents

Add new element to array using $push operator

shop> db.comments.updateOne({_id:5}, {$push: {comments: {user: "Eva", text: "Subscribe"}}})
{
  acknowledged: true,
  insertedId: null,
  matchedCount: 1,
  modifiedCount: 1,
  upsertedCount: 0
}

Remove last element from the array using $pop operator

shop> db.comments.updateOne({_id: 5}, {$pop: {'comments': 1}})
{
  acknowledged: true,
  insertedId: null,
  matchedCount: 1,
  modifiedCount: 1,
  upsertedCount: 0
}
shop>

Update the emdedded documents usinh $ or positional operator

shop> db.comments.updateOne({_id: 7, 'comments.user': 'Alice'}, {$set: {'comments.$.text': "Awesome Prabin"}})
{
  acknowledged: true,
  insertedId: null,
  matchedCount: 1,
  modifiedCount: 1,
  upsertedCount: 0
}
shop> db.comments.find({_id: 7})
[
  {
    _id: 7,
    title: 'Introduction to MongoDB',
    content: 'MongoDB is a popular NoSQL database...',
    author: 'Vinod Thapa',
    comments: [
      { user: 'Alice', text: 'Awesome Prabin' },
      { user: 'Vinod', text: 'Thanks for sharing.' }
    ],
    metadata: { views: 1000, likes: 70 },
    status: false
  }
]