Selecting specific documents with Mongoose

My question is: How can I get all documents where category === 'something'?

model.js (model):

var Schema = new mongoose.Schema({
  category: String,
  title: String
});

Mongoose:

var express = require('express');
var router = express.Router();
var mongoose = require('mongoose');
var Model = require('../models/model.js');

router.get('/:category', function(req, res, next) {
  Model.find({ category: req.params.category}, function(err, post){
    if (err) return next(err);
    res.json(post);
  });
});

JS in my controller:

Model.get({category: 'something'}, function() {
  //callback
});

Goal: Once I am able to get these documents, I want to batch update the category property, but I can't get the query to work. I could get the ids and update individually, but that's bad, mmkay.

I want to thank you in advance for your responses. I sincerely appreciate it.