Question 116358 in Mongodb Question posted in
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Mongodb – how to Push item into array via mongoose?

I’m looking to push this ObjectId from the Notes Schema: 635b70c1121186eefbbc5718

into the ‘notesId’ of this other Category Schema:

{
  _id: new ObjectId("635b70c0121186eefbbc5714"),
  name: 'frenchLessons',
  creator: new ObjectId("635aa97815faaa052ae9cfce"),
  notesId: [],
  __v: 0
}

What I did was that I found the Category which holds both the name of the category in question and the Id of the current signed in user and tried push method but its not working:

.then(() => {
              return Category.find({ name: categoryName, creator: creator });
            })
            .then((category) => {
              category.notesId.push(note._id); //returns TypeError: Cannot read properties of undefined (reading 'push')
              return category.save();
            });

console.log(category) returns me the correct document

Tags:

2

Answers


  1. 0

    Set a default notesId in case it was not defined.
    Also, you should use findOne if you want to retrieve a single object:

    Category.findOne(
    { name: categoryName, creator: creator },
    async (err, category) => {
      if (category.notesId === undefined) category.notesId = [];
      category.notesId.push(note._id);
      await category.save();
    }
  );

    Alternatively, you could add default: [] to the notesId field in the schema declaration.

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  2. 0

    This will help you to push _id directly to the array.

      let data=await Category.findOneAndUpdate({ name: categoryName, creator: creator }, {
    $push: { notesId : note._id},
  });
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