push object into nested array with mongoose

Question

im new to mongodb and im having a problems. I have a document like this

[
    {
    _id: "post1",
    content: "post1 content",
    comments: [
    {
      id: "comment 1",
      user:"user comment",
      replies:[]
    },
    {
      id: "comment 2",
      user:"user comment",
      replies:[]
    }
        ]
    },
{
    _id: "post2",
    content: "post2 content",
    comments: [
    {
      id: "comment 1",
      user:"user comment",
      replies:[]
    },
    {
      id: "comment 2",
      user:"user comment",
      replies:[]
    }
        ]
    }
]

How can i put new object into replies? I got the postid and commentid i need

Charchit Kapoor · Accepted Answer · 2022-06-12 14:06:27Z

1

Use $elemMatch operator to match your specific comment in a post, and then push the reply into the replies array using $push. Like this:

db.collection.update({
  _id: "post1",
  comments: {
    $elemMatch: {
      id: "comment 1"
    }
  }
},
{
  "$push": {
    "comments.$.replies": {
      "$each": [
        "value1",
        "value2"
      ]
    }
  }
})

Here is the playgrounf link.

In mongoose it can be achieved like this:

await CollectionName.updateOne({
      _id: "post1",
      comments: {
        $elemMatch: {
          id: "comment 1"
        }
      }
    }, {
      "$push": {
        "comments.$.replies": {
          "$each": [
            "value1",
            "value2"
          ]
        }
      }
    });

answered Jun 12, 2022 at 14:06

Charchit Kapoor

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12 Comments

nevicoder Over a year ago

Why code runs on the playground but not in my project? Do you know any reason? There is no error message, just run but no changes in my document

Charchit Kapoor Over a year ago

What version of mongoose are you using? And what is the exact mongoose query? Please share it, here

nevicoder Over a year ago

im using mongoose 6.3.4 here is my code

await Post.updateOne(       {         postId: postId,         comments: {           $elemMatch: {             id: commentId,           },         },       },       {         $push: {           "comments.$.replies": {             $each: [               {                 id: new mongoose.Types.ObjectId(),                 user: req.user,                 content: req.body.reply__content,               },             ],           },         },       }     )

Charchit Kapoor Over a year ago

Try this query and check whether it returns anything or not. await Post.findOne({ postId: postId, comments: {$elemMatch: { id: commentId}}})

nevicoder Over a year ago

Thank you so much for supporting me That query just return null for some reason

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