What is the process of mapping an array of object IDs in order to retrieve the corresponding objects associated with each ID

I currently have a specific collection that stores IDs referencing objects in a separate schema.

If I'm working with an array containing these IDs, what is the best way to iterate through and retrieve the corresponding object?

Although I've made an attempt, my results are returning empty objects:

// This code fetches an array of itemIds previously bought by a particular buyer.
const prevPurchases = await Sales.find({ buyerId }).select(["itemId"]);

const item = prevPurchases.map(async (e) => {
   try {
      const item = await Item.findById(e.itemId).select(["image", "name"]);
      return item;
   } catch (e) {
      return null;
   }
});

await Promise.all(item);

return res.status(200).json({ item }); // Current output: "{}, {}, {}, etc" 

How can I resolve this issue and ensure that the objects fetched include both the image and name of the items as specified in the select? Your help is greatly appreciated!

Answer №1

If you gather item identifiers in an array, you can utilize the $in operator to retrieve all items with a single query.

try {

  const pastPurchases = await Sales.find({ buyerId }).select(["itemId"]);

  let items = [];
  if (pastPurchases.length) { 
    items = await Item.find({ 
      _id: { $in: pastPurchases.map((e) => e.itemId) } 
    }).select(["image", "name"]);
  }

  return res.status(200).json({ items });

} catch (error) {
  return null;
}

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