Why spread() method doesn't work in Sequelize?

Question

I'm using a Sequelize for my node.js app. I use findOrCreate() method to create a new user if not exist. Accordingly to docs findOrCreate returns an array containing the object that was found or created and a boolean that will be true if a new object was created and false if not.

The sequelize recommend to use spread() method which divides the array into its 2 parts and passes them as arguments to the callback function. First part is a user object and second is boolean if new row was added.

I work in async/await style. My code is:

app.post('/signup', async (req, res) => {
        try {
            let insertedUser = await User.findOrCreate({
                where: { email: req.body.userEmail },
                defaults: {
                    pass: req.body.userPass
                }
            })
            insertedUser.spread((user, created) => {
                if(created) {
                    res.json(user.email)
                }
            })
        } catch (err) {
            console.log(`ERROR! => ${err.name}: ${err.message}`)
            res.status(500).send(err.message)
        }
    }
})

After post request I get an error:

ERROR! => TypeError: insertedUser.spread is not a function

Why is that, the doc says it must be a function?

Answer 1

spread method does not exist on resolved value from findOrCreate. You have to either chain spread with then of promise returned by findOrCreate. Or you need to chain with findOrCreate directly and use await.

Here is the updated code with await:

app.post('/signup', async (req, res) => {
        try {
            let created = await User.findOrCreate({
                where: { email: req.body.userEmail },
                defaults: {
                    pass: req.body.userPass
                }
            }).spread((user, created) => {
                return created;
            })
            if(created) {
                res.json(user.email)
            }
        } catch (err) {
            console.log(`ERROR! => ${err.name}: ${err.message}`)
            res.status(500).send(err.message)
        }
    }
})