create data to three tables at once with Sequelizer - mysql

Question

I want to get data from form and based on that, add data to three tables in mySQL, I use Sequelize to do so, However I don't how to do so, my current idea gives error:
Unhandled rejection Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers
after they are sent to the client
My code is like this:
app.post("/device/add", (req, res) => {
db.Devices.create({
device_id: req.body.device_id,
server: req.body.server,
type: req.body.type
})
.then(result => {
res.json(result);
})
.catch(err => {
throw err;
});
db.Modules.create({
device_id: req.body.device_id,
device_options: req.body.device_options,,
sleep_options: req.body.sleep_options
})
.then(result => {
res.json(result);
})
.catch(err => {
throw err;
});
db.Tests.create({
device_id: req.body.device_id,
gsm_tests: req.body.gsm_tests,
led_tests: req.body.led_tests,
})
.then(result => {
res.json(result);
})
.catch(err => {
throw err;
});
});
can I somehow create it in one response? Or how to make it work

Answer 1

The problem is that you are trying to send again a response after you have sent one.
For more clarification, refer here
You can use Promise.all() to accumulate the results and then send it in one res.json() call.
const createDevice = db.Devices.create({
device_id: req.body.device_id,
server: req.body.server,
type: req.body.type
})
const createModules = db.Modules.create({
device_id: req.body.device_id,
device_options: req.body.device_options,
sleep_options: req.body.sleep_options
})
const createTests = db.Tests.create({
device_id: req.body.device_id,
gsm_tests: req.body.gsm_tests,
led_tests: req.body.led_tests,
})
Promise
.all([createDevice , createModules , createTests ])
.then(result=> {
res.json({
devices: result[0],
modules: result[1],
test : result[2]
});
})
.catch(err => {
throw(err);
});