Pushing a new object to a nested array in Mongoose in async functions

Question

Let's say I have a Schema that looks like this:

const Schema1 = new Schema({
  field1: String,
  field2: String,
  array1: [{
    objfield1: String
    objfield2: Date,
    objfield3: {
      type: Schema.Types.ObjectId,
      ref: 'OtherModel',
      required: true,
    },
  }],
}, options);

Here array1 is an array of objects. I want to be able to hit an endpoint with a PUT request and push a new object into the array1 array. I have tried using _.merge from lodash, I have tried using push to add the new object into the array, but to no avail.

exports.addObject = async (req, res, next) => {
  try {

    let schemaInstance = await db.Schema1.findById(req.params.id);
    schemaInstance['array1'].push(req.body)
    schemaInstance.markModified('array1');
    let updatedSchemaInstance = await schemaInstance.save();

    return res.status('200').json(updatedSchemaInstance);

  } catch (err) {
    console.log(err);
    return next({
      status: 400,
      message: 'No users in the database',
    });
  }
};

do you get any err from the try..catch?

Bob Kimani
– Bob Kimani

2020-03-02 20:52:34 +00:00
Commented Mar 2, 2020 at 20:52 — Bob Kimani
– Bob Kimani, Commented Mar 2, 2020 at 20:52

Elias Bracaval · Accepted Answer · 2020-03-03 11:20:34Z

2

if you want update your array with new element, use findOneAndUpdate() function and $push

like:

exports.addObject = async (req, res, next) => {
  try {

    let schemaInstance = await db.Schema1.findOneAndUpdate(
      {_id: req.params.id}, 
      {$push: {'array1': req.body});
    schemaInstance.markModified('array1');
    let updatedSchemaInstance = await schemaInstance.save();

    return res.status('200').json(updatedSchemaInstance);

  } catch (err) {
    console.log(err);
    return next({
      status: 400,
      message: 'No users in the database',
    });
  }
};

mongoose findOneAndUpdate() : https://mongoosejs.com/docs/api.html#model_Model.findOneAndUpdate mongo $push : https://docs.mongodb.com/manual/reference/operator/update/push/

edited Mar 3, 2020 at 11:20

answered Mar 2, 2020 at 21:37

Elias Bracaval

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1 Comment

ipenguin67 Over a year ago

Thanks! This worked, with the caveat that the option {new: true} is needed to return the updated record.

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