I'm trying to respond in case a fetch for an item doesn't return something from another method that doesn't have the express response. I call this method from another that if it has the express response:
const updateItem = async (req, res = response ) => {
const id = req.params.id;
const idItem = req.params.idItem;
await itemExists( id, idItem);
...
And in the itemExists() function I search for the item in mongo and if it doesn't exist I want to send it as a response but I don't know how to do it without using Express response:
const itemExists = async ( id, idItem ) => {
const item = await PettyCashItems.findOne({ _id: id, "items._id": idItem });
if (!item) {
return ......
}
}
Thanks.
As already mentioned by one of the comments, there's no way to use response object without having access to it.
However, what you want can be achieved in two ways:
1- Easy way - return a value from itemExists function and send the response according to returned value from itemExists
const updateItem = async (req, res = response ) => {
const id = req.params.id;
const idItem = req.params.idItem;
const exists = await itemExists( id, idItem);
if (exists) {
res.send('YES')
return;
}
res.send('NO');
}
2- Better way - Setup error handling for your express application so all thrown error are caught and response is sent based on the thrown error, then you can simply
class BaseHTTPException extends Error {
constructor(statusCode) {
super();
this.statusCode = statusCode;
}
}
class ItemDoesNotExistException extends BaseHTTPException {
constructor() {
super(400)
}
}
throw new ItemDoesNotExistException()
in your itemExists function.
Further reading: https://expressjs.com/en/guide/error-handling.html