How do I update a specific document from a form through mongoose? - node.js

Question

Struggling with this problem because I'm missing some fundamentals I think, but after hours looking through the docs I think I need some help :)
I have a (simplified) collection as so:
const ExampleSchema= new Schema ({
Word: String,
Difficulty: String,
)};
Which I am succesfully displaying on a page as so:
<% ExampleSchemas.forEach(exampleschema=> { %>
<p><%= exampleschema.word %></p>
<p style="display: none" name="ExampleSchemaID" value="<%= ExampleSchema._id %>"</p>
<% }) %>
For each word I have a form below, I would like the user to be able to select easy, ok or hard and for this to set the value in the DB.
<form method="PUT">
<button formaction="/review/feedback/easy">Easy</button>
<button formaction="/review/feedback/ok">Ok</button>
<button formaction="/review/feedback/hard">Hard</button>
/form>
I have played around with a route like this to no avail
router.put("/review/feedback/easy", function (req,res){
var ID = req.body.ExampleSchemaID;
ExampleSchema.findByIdAndUpdate(
req.params.ExampleSchema._id,
req.Difficulty= easy);
The further issue is that I would like to display x number of these documents to the user, therefore I need a route that gets only that specific word.

Answer 1

router.put("/review/feedback/easy", function (req,res){
var ID = req.body.ExampleSchemaID;
ExampleSchema.findByIdAndUpdate({"_id": req.params.ExampleSchema._id},{"Difficulty": "3"});
but please not your difficulty is a number, so why not use a number instead:
const ExampleSchema= new Schema ({
Word: String,
Difficulty: Number,
)};
router.put("/review/feedback/easy", function (req,res){
var ID = req.body.ExampleSchemaID;
ExampleSchema.findByIdAndUpdate({"_id": req.params.ExampleSchema._id},{"Difficulty": 3});