How do I toggle boolean values in JSON object using express? - node.js

Question

I am a beginner and have just finished my first MERN CRUD app. I've thought about a few ways to improve the app. The app is a todo list and has a complete button. The complete button will score a line through an item in the todo list. The complete button triggers a function which will make a post request (shown below) to the nodejs/express backend server. When the "isCompleted" field in the Mongo model is set to "true" (by default it's false), the item will be scored out. I tried to find a way to toggle the boolean values in the "isCompleted" field, whenever the complete button is clicked. This way you can unscore an item. But I just couldn't figure out how to implement this. Any ideas?
exports.updateEntry = async (req, res, next) => {
try {
const entry = await Entry.findByIdAndUpdate({_id:req.params.id}, {isCompleted: true});
return res.status(200).json({
success: true,
data: entry
});
} catch (err) {
return res.status(500).json({
success: false,
error: 'Server Error'
});
}

Answer 1

before the
const entry = await Entry.findByIdAndUpdate({_id:req.params.id}, {isCompleted: true});
you need to fetch the current value of the variable, should be something like this (been a long time since i worked with mongo):
const isCompleted = await Entry.findById({_id:req.params.id}).select('isCompleted')
then use !isCompleted to get the toggled value, like this:
const entry = await Entry.findByIdAndUpdate({_id:req.params.id}, {isCompleted: !isCompleted});

Answer 2

You can use body-parser middleware at top of your function (maybe you need it at a general level, so you can use it at index.js of your express project).
Then you can do this:
exports.updateEntry = async (req, res, next) => {
try {
const entry = await Entry.findByIdAndUpdate({_id:req.params.id}, {isCompleted: req.body.isCompleted});
return res.status(200).json({
success: true,
data: entry
});
} catch (err) {
return res.status(500).json({
success: false,
error: 'Server Error'
});}