Loop through array and add data

Question

I have an array called "content". In this array is the "asin-id" (It's a kind of product ID). I'm trying to loop through the content array and get from the asin-id the specific product so I can add the product to the array and save the new content-array in the db.

Something is wrong. I don't know how to do it.

Expected result:

content: [{ asin: "asin-ID", product: product }, ...]

What I tried:

exports.createBlogPost = async (req, res) => {
    try {
        const content = req.body.content

        content.map(async (element) => {
            const asin = element.asin
            const product = await Product.findOne({ asin: asin })
            element.product = product
            return element
        })

        console.log(content)
    

        const post = new BlogPost({
            postTitle: req.body.postTitle,
            postQuery: req.body.postQuery,
            content: content,
            mainImage: req.file
        })
        console.log("Saved: " + post)
        await post.save()

        if(post) {
            return res.status(200).json({
                success: true,
                message: 'Saved blog post successfully',
                post: post
            })
        }
    } catch(err) {
        console.log(err)
    }
}

"Something is wrong" isn't sufficient for explaining your error... You should be as specific as possible, especially pertaining to the actual error occurring, so that we can help. — silencedogood
– silencedogood, Commented Oct 5, 2021 at 14:10
The problem is I don‘t get the product in the content array. — Philippe
– Philippe, Commented Oct 5, 2021 at 14:16
I see. You're not actually getting an error... The values just aren't being populated as expected. I think I see the issue. I posted an answer that should help. — silencedogood
– silencedogood, Commented Oct 5, 2021 at 15:16

silencedogood · Accepted Answer · 2021-10-05 14:29:42Z

1

I think the problem may be simply that you're using map without assigning the result to a variable. Try replacing your code with something similar to the following:

let updatedContent = content.map(async (element) => {
        const asin = element.asin
        const product = await Product.findOne({ asin: asin })
        element.product = product
        return element
 })

 console.log(updatedContent)

answered Oct 5, 2021 at 14:29

silencedogood

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