How to push data in MongoDB's array with mongoose

Question

I have an empty array in MongoDB

And I want to push the Id in it.

router.put(
  "/like/:id",
  (req, res) => {
    User.findOne({ _id: req.user._id }).then(data => {
      if (data) {
        Post.update(
          { _id: ObjectId(req.params.id) },
          { $push: { likes: req.user._id } }
        );
      }
    });
  }
);

This code is not working on how I achieve this.

findOne() in Mongoose returns a Query, not a Promise. You need to chain the exec method for you to get a promise i.e. User.findOne({ _id: req.user._id }).exec().then(...) or User.findById(req.user._id).exec().then(...) — chridam
– chridam, Commented Feb 20, 2020 at 11:23

Debasis Das · Accepted Answer · 2020-02-20 15:02:22Z

1

router.put (
  "/addlike/:id",
  passport.authenticate("jwt", {
    session: false
  }),
  (req, res) => {

   // use try-catch 
   try { 
    User.findOne({ _id: req.user._id }).then(data => {
      if (data) {
        Post.findOneAndUpdate(
          { _id: ObjectId(req.params.id) },
          { $push: { likes: req.user._id },
          { "new": true, "upsert": true} }
        );
      }
    });
   } catch(err){
    // handle error
    console.log('Error => ', err);
   }
  }
);

I have tested this in my local system ... working fine

answered Feb 20, 2020 at 15:02

Debasis Das

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4 Comments

Rohit Nishad Over a year ago

When i am use this code my VS code give me some syntax error.

Debasis Das Over a year ago

@RohitNishad Do not copy paste whole code. follow logic. Use findOneAndUpdate Post.findOneAndUpdate( { _id: ObjectId(req.params.id) }, { $push: { likes: req.user._id }, { "new": true, "upsert": true} } );

Debasis Das Over a year ago

@RohitNishad You have solved this problem by using my logic. Am i right ???

Rohit Nishad Over a year ago

No, i just change few things. like use $addtoset in place of $push and remove User.findOne etc.

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