Matching array to a string in Javascript (NodeJS + EJS)

Question

edited

Function in the controller:

async postShow(req, res, next) {
        let post = await Post.findById(req.params.id).populate({
            path: 'reviews',
            options: { sort: { '_id': -1 } },
            populate: {
                path: 'author',
                model: 'User'
            }
        });
        let users = await User.find().exec();

        res.render('posts/show', { post, users });

going into the show.ejs page:

 <% users.forEach(function(user) { %>
                        <% console.log(user) %>
                    <% }) %>

this will return the following (from mongoDB) :

  { image: { secure_url: '/images/default-profile.jpg' },
    _id: 5d68ea449ee71014067986e2,
    username: 'john',
    email: '[email protected]',
    __v: 0 },
  { image: { secure_url: '/images/default-profile.jpg' },
    _id: 5d68ef0e3e133417dcc60c64,
    username: 'Tom',
    email: '[email protected]',
    __v: 0 } ]

Now <% post.author %> will return the post author's id like 5d68ef0e3e133417dcc60c64

Thing is, In the ejs template i want to match post.author to user._id and if they match i want it to return user.username of the specific user that was matched. I hope it's a bit more clear now. Thanks again

1. No, the log is not an array. Each iteration of the loop simply prints a string. 2. Please post your data (original array of posts and users) so we can help you with some code. — sandrooco
– sandrooco, Commented Aug 30, 2019 at 11:25

Brett Gregson · Accepted Answer · 2019-08-30 11:24:45Z

1

You can use find(): The find() method returns the value of the first element in the array that satisfies the provided testing function. Otherwise undefined is returned.

var found = users.find(function(user) {
  return user._id == post.author;
});

This will return the user who's _id property matches the post.author value

Working fiddle here

answered Aug 30, 2019 at 11:24

Brett Gregson

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6 Comments

noname Over a year ago

I think it should be return user._id == post.author._id assuming that author is the name. Or return user == post.author but this I am not sure if it works in JS

Brett Gregson Over a year ago

@noname the question says: console.log(post.author) will return a string if it's not in the forEach loop "bye1" so it seems the author property is that string

Or05230 Over a year ago

Sorry it won't help since i'm trying to access it on the front end via EJS template, and users.find afaik won't work . p.s i have edited the post with more details

Brett Gregson Over a year ago

Can't you just do it before your render and pass it through to the front end?

noname Over a year ago

@BrettGregson yeah right, but in my understanding author mean 'a string' not string which is 'id' and also because he mentioned he using mongodb so I can assume author want to compare user._id with post.author._id

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