Array not passing in express to mongo - node.js

Question

I'm trying to pass an array to MongoDB using express post request.
app.post('/createGroup', (req, res) => {
const { title, description, tenants } = req.body;
const group = {
title: title,
description: description,
tenants: tenants,
};
console.log(tenants);
const newGroup = new Group(group);
newGroup.save();
res.redirect('/'); });
Everything works just fine till here. if I log console.log(tenants) returns and array of ids
[ 'd8ef412c-7947-4500-8e7f-73157e30961e', 'a515dfa8-a272-4d95-87d2-a1a4f22175b5' ]
But the tenants are not passed to MongoDB.
Instead, I get
_id: 623639bde8f1bdfc6eab462e
title: "Nitro"
description: "Its a Group"
tenants: Array
created_at: 2022-03-19T20:14:53.268+00:00
__v: 0
Here is my Schema,
const GroupSchema = new mongoose.Schema({
title: String,
description: String,
tenants: [{type: String}],
created_at: {
type: Date,
default: Date.now
}
});
The HTML form is here.
<form class="create-group" action="/createGroup" method="POST">
<div class="form-group">
<label for="title">Group Title</label>
<input type="text" class="form-control" id="title" name="title" placeholder="Group Title / Name">
</div>
<div class="form-group">
<label for="description">Group Description</label>
<textarea class="form-control" id="description" name="description" rows="3"
placeholder="Group Description"></textarea>
</div>
<div>
<fieldset>
<legend>
Tenants
</legend>
<% tenants.forEach(function(tenant) { %>
<div class="form-check">
<input class="form-check-input" type="checkbox" value="<%= tenant.tenantId %>" name="tenants[]">
<label class="form-check-label" for="<%= tenant.tenantId %>">
<%= tenant.tenantName %>
</label>
</div>
<% }) %>
</fieldset>
</div>
<div class="form-group">
<button type="submit" class="btn btn-primary">Create Group</button>
</div>
</form>

Answer 1

I believe the issue is in your schema, you should be defining tenants array property like this
tenants: [String]
or you can do
tenants: { type: [String] }