How do you replace the entire items of a mongodb collection and with a Javascript array? - mongodb

Question

I have an original mongodb collection that looks like this that populates in my app:
{"_id": "57d5af7de3a3885aa7381380", "name": ["Barry Allen", "Bruce Banner",
"Clint Barton",
"Arthur Curry",
null]}
How can I replace my mongodb collection with a javascript array that looks like this:
var newRoster =
["Peter Parker", "Susan Storm", "Victor Stone",
null, "Jennifer Walters];
I tried doing this in my js file.
$.ajax({
method: 'POST',
url: '/students',
data: {
updatedRoster: newRoster,
},
success: function(response){
console.log(response);
if (response == 'success'){
alert('Successfully updated');
} else {
alert('Error');
}
}
});
I tried going this in my node file.
app.post('/students', function(req, res){
db.students.update({"name": req.body.updatedRoster},
function(err, docs){
if (err) throw err
res.send('success');
});
});

Answer 1

The first object in the update function is a selector. It tells mongoDB which document you want to update. The second object is used to tell mongoDB how you want the found document(s) to be changed.
So, try this:
// client
$.ajax({
method: 'POST',
url: '/students',
data: {
_id: id,
updatedRoster: newRoster
},
success: function(response){
console.log(response);
if (response == 'success'){
alert('Successfully updated');
} else {
alert('Error');
}
}
});
// server
app.post('/students', function(req, res){
db.students.update(
{ "_id": req.body._id },
{ $set: { "name": req.body.updatedRoster } },
function(err, docs) {
if (err) throw err
res.send('success');
}
);
});