Utilizing mongoose's findOneAndUpdate method allows for fetching and returning only the modified element within an array

I've encountered the following issue:

  let post = await User.findOneAndUpdate(
    { _id: USER_ID },
    {
      $push: {
        posts: {
          title,
          content,
          userId: USER_ID,
          titleUrl,
          thumbnail: {
            webp: WEBP_PATH,
            jpeg: JPEG_PATH,
            placeholder: PLACEHOLDER
          }
        }
      }
    },
    { new: true }
  );

This query is mostly functional. However, my problem arises when pushing an item to the array as I want only the updated element returned. Instead, I'm receiving the entire document with all posts in the array. While I could use something like posts.slice(-1), it seems quite inefficient to load everything when I only require one element, doesn't it?

Does anyone know of a way to retrieve just the newly added object?

Answer №1

Regrettably, there is currently no method available using findOneAndUpdate

While you can apply projection to the original document, it cannot be directly applied to the updated document with findOneAndUpdate

At present, there seems to be no simple or efficient solution for this issue.

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