Essentially, there are 2 queries. The first one queries a collection_A and then return an array of _id. The second query will use this array in a $in operator to query collection_B. How can this be done in just 1…
I have installed cors via npm and used the app.use(cors());middleware, but it is not solving my issue. I am running my frontend React App on Port localhost:3000 Access to XMLHttpRequest at 'http://localhost:3087/authenticate-token' from origin 'http://localhost:3000' has been blocked by CORS…
I am trying to display a specific field of the first object that is inside a array of objects. index.js: router.get('/chatroom', ensureAuthenticated, (req, res) => { const user = req.user chatroom.find({chatroom_users: user.name}, function (error, data) { res.render("chatroom", { data, user:…
I'm setuping a C# Asp.Net Core Api that will grow quite a bit in the future. So I'm trying to respect the Clean Code architecture, with my domain in the center without any dependences and everything around: public abstract class…
I have a MongoDB document with the following attributes: { "label": [ "ibc", "ibd", "ibe" ], "location": "vochelle st" } and I have to return the document only if the documents label exactly matches the given array i.e., ["ibc","ibd"] and…
I'm trying to figure out a way which I can load data from the database only once to a certain component. useEffect(() => { axios.get("http://localhost:5000/members") .then(res => { setMembers(res.data) }) catch(error => console.error(error.message)) }) Every time this component is loaded…
I am started learn NodeJS + MongoDB. Before that, I studied React + Redux. As I understand MongoDB replaces Redux or is it not? If not, what data should be stored in Redux and what data in MongoDB?
I have a collection with products with structure like this: { _id: 01, user_id: 10, line_items: [ { _id: 2, quantity: 2, }, { _id: 3, quantity: 1, } ], purchase_date: 2021-02-05T21:00:00.000+00:00 } How can I find out how many…
I have a collection with docs like: {ID: xxx, firstCreateDate: xxx, isActive: false} I want to find all the docs where isActive = false, then update isActive to true, and also update firstCreateDate to current date if not set before.…
I have the following error : UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node…