Cant Map() Through An Array Of Objects - node.js

Question

Been trying to solve this one for quite a while now.
I am saving an array which contains objects to my data base,
When I try to map() through it to retrieve the object's properties its just rendering nothing.
This is the app.js code :
app.get("/:plasticcategory/product/:plasticproduct", (req, res) => {
const plasticCategory = _.startCase(_.toLower(req.params.plasticcategory));
const plasticProduct = req.params.plasticproduct;
Product.find({category: plasticCategory, title: plasticProduct},'alt', (err, foundItem) => {
if(err){
console.log(err)
}else {
console.log(foundItem);
res.render('alternatives', {altProduct: foundItem});
}
});
});
When I console.log(foundItem) the result is [ { _id: 5f5f9b2a9f999b1e9009072b, alt: [ [Object] ] } ]
This is my ejs code(trying to render the alt's array objects properties:
<% altProduct.map(alt => {%>
<div class="col-lg-3">
<h1><%=alt.altTitle %></h1>
<img src="<%=alt.altImage%>" alt="alt-image">
Get it now!
</div>
<% }) %>
I have added images to make it more clear, Thank You <3
enter image description here

Answer 1

When you render the template, I see you call it like this:
res.render('alternatives', {altProduct: foundItem});
Where foundItem is the array [{ id: 'something', alt: [{ someObject }] }].
This is an array of results. Each of those results has a key called 'alt' with items in it. If you want to render all of those items together, you will need to compile them all into a single array. (This is called 'flat-mapping'.)
Starting inside the else block of the callback of Product.find:
const itemArrays = foundItem.map(item => item.alt); // Get the inner array from each result
const allAlternativeProducts = [].concat(...itemArrays); // Collect all these products into a single array
res.render('alternatives', {altProduct: allAlternativeProducts});