I'm currently delving into the world of Express in conjunction with Mongoose. I encountered an issue while working on a page that involves running a forEach loop on a list of "campgrounds" fetched from a MongoDB. From what I understand, when using the .find function, it's not mandatory to include the err argument and then check it within an if statement. However, when I removed the err argument along with the corresponding if statement, I faced a "cannot run forEach on null" error. Strangely, by simply adding back the err argument (without making any other changes), my code started functioning seamlessly. While this workaround works fine, I'm eager to grasp the underlying mechanisms at play here. Thank you in advance for any insights!
Snippet from App.js
// Establish the campgrounds route
app.get("/campgrounds", function(req, res) {
// Retrieve Campgrounds from the DB
Campground.find({}, function(err, dbCampgrounds) {
// Check for potential errors
if (err) {
console.log(err);
// Render the campgrounds page, passing in the campground data from the database
} else {
res.render("campgrounds", {
renderCampGround: dbCampgrounds
});
}
});
});
Part of the EJS file
<div class="row">
<% renderCampGround.forEach(function(x){ %>
<div class="col-med-3 col-sm-6">
<div class="thumbnail">
<img src="<%= x.image %>">
</div>
<div class="caption">
<h4 <%= x.name %>>
</div>
</div>
</div>
<% }); %>
</div>