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Mastering Development

I get an error when trying to establish a $ lookup relationship in Mongodb and nodejs

I’m at the learning stage yet. I am having trouble establishing a relationship in Mongodb. error not found 404 I made all the operations in the collections with the data in both tables, and in the training I received. But somehow I couldn’t run it successfully. Models Books const Book = require(‘../Models/Book’); router.post(‘/new’, function(req, res, […]

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Ask Engineering

Is there any standard way of defining respective data structures to read the sensor data into?

So I have been wondering about the standard way of structuring your files/code when it comes to reading data from the driver file. So what I now have is a buffer that’s supposed to store the data that we, as user, requested from the driver file. Since we can’t pass arrays to the function (decays […]

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Mastering Development

mongodb aggregate apply a function to a field

As part of an aggregate I need to run this transformation: let inheritances = await db.collection(‘inheritance’).aggregate([ { $match: { status: 1 }}, // inheritance active { $project: { “_id”:1, “name”: 1, “time_trigger”: 1, “signers”: 1, “tree”: 1, “creatorId”: 1, “redeem”: 1, “p2sh”: 1 } }, { $lookup: { from: “user”, let: { creatorId: { $concat: […]

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Development

How to do a Mongo aggregation query in Spring Data?

It’s the first time I am using Mongo in Java and I am having some problems with this aggregation query. I can do some simple queries in Mongo for Spring with @Query annotation in my Repository interface which extends the MongoRepository<T, ID>. It would be helpful to know which approach to take when you do […]

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Development

How to implement aggregation query in Spring Data MongoDB?

I am new with Spring Data MongoDB and I am trying to implement an aggregation query in Java with Spring Data MongoDB. I have tried searching from this problem and approached it using MongoTemplate, but still to no result. The format of my data: [{ “_id” : ObjectId(“5e1aea6c275360baf96bac29”), “title” : “postim”, “upvotesBy” : [ “5e18b4c12753608718dfa007”, […]

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Development Domain

Node Error – Using a domain property in MakeCallback is deprecated

I`m getting this error while doing an request. (node:3993) [DEP0097] DeprecationWarning: Using a domain property in MakeCallback is deprecated. Use the async_context variant of MakeCallback or the AsyncResource class instead. That`s the code of my controller: AppointmentController The code of the queue: Queue Nodemailer: Mail async delete(req, res) { const { appointment_id } = req.params; […]