Qt C++ QNetworkRequest not making any requests - c++

Question

I'm trying to fetch some data from an API using QNetworkRequest following this video (https://youtu.be/G06jT3X3H9E)
I have a RoR server running on localhost:3000 and I'm trying to fetch something from it.
.h file:
#ifndef WORKER_H
#define WORKER_H
#include <QObject>
#include <QDebug>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <QAuthenticator>
#include <QNetworkProxy>
class Worker : public QObject
{
Q_OBJECT
public:
explicit Worker(QObject *parent = nullptr);
signals:
public slots:
void get(QString code);
private slots:
void readyRead();
void authenticationRequired(QNetworkReply *reply, QAuthenticator *authenticator);
void encrypted(QNetworkReply *reply);
void finished(QNetworkReply *reply);
void networkAccessibleChanged(QNetworkAccessManager::NetworkAccessibility accessible);
void preSharedKeyAuthenticationRequired(QNetworkReply *reply, QSslPreSharedKeyAuthenticator *authenticator);
void proxyAuthenticationRequired(const QNetworkProxy &proxy, QAuthenticator *authenticator);
void sslErrors(QNetworkReply *reply, const QList<QSslError> &errors);
private:
QNetworkAccessManager manager;
};
#endif // WORKER_H
.cpp file:
void Worker::get(QString code)
{
qInfo() << "Getting something from the server...";
QNetworkReply* reply = manager.get(QNetworkRequest(QUrl(QString("http://localhost:3000/api/v1/circle_gift_cards/scan?codes=" + code))));
connect(reply, &QNetworkReply::readyRead, this, &Worker::readyRead);
}
void Worker::readyRead()
{
qInfo() << "ReadReady";
QNetworkReply* reply = qobject_cast<QNetworkReply*>(sender());
if(reply) qInfo() << reply->readAll();
}
The result from:
Worker worker;
worker.get("abc");
is: "Getting something from the server..."
it should print "ReadReady" when the request is ready, but I don't think the request is being made, there's nothing in the console either.
[Edit 1]
What is calling the worker is this
void MainWindow::on_lineEditScanCard_textChanged(QString code) {
Worker worker(this->site);
worker.get(code);
}
It's an Edit field(where the user is supposed to type a code
[Edit 2]
I removed all app code and did this:
#include <QApplication>
#include "Forms/mainwindow.h"
#include "Requests/worker.h"
int main(int argc, char *argv[]) {
QApplication a(argc, argv);
Worker worker;
worker.get("abc");
return a.exec();
}
And it worked... Why it does not work when called when the Edit text is changed?

Answer 1

Remember the concepts of scope, life cycle, and local variables? In your case worker is a local variable that will be destroyed instantly so the slot is not invoked, use
Worker * worker = new Worker;
worker->get("abc"); //remember to delete the memory when you no longer use it