Sequelize: TypeError: Converting circular structure to JSON-CodePudding

I have Orders and Display models. The association works like this

Display.associate = models => Display.hasOne(models.Orders);

The orders table has displayId reference and there is nothing circular in my design. However I get this error below.

TypeError: Converting circular structure to JSON
    --> starting at object with constructor 'Socket'
    |     property '_writableState' -> object with constructor 'WritableState'
    |     property 'afterWriteTickInfo' -> object with constructor 'Object'
    --- property 'stream' closes the circle
    at JSON.stringify (<anonymous>)

the error dissapears if I do not include dbDisplay shown below.

export const getAllOrders = async (req, res) => {
    console.log("GET ALL ORDERS")
    let orders = await dbOrders.findAll({
        include: [{
            model: dbDisplay,
        }]
    }).catch(error => res.status(400).send(error));
    try {
        res.status(200).send(orders) // error here

    } catch (err) {
        console.log(err)
    }
}

CodePudding user response：

Don't try to send model instances themselves. Use their get({ plain: true }) method to get plain object(s):

export const getAllOrders = async (req, res) => {
    console.log("GET ALL ORDERS")
    try {
        const orders = await dbOrders.findAll({
        include: [{
            model: dbDisplay,
        }]
        })
        res.status(200).send(orders.map(x => x.get({ plain: true })))
    } catch (err) {
        console.log(err)
        res.status(400).send(err) 
    }
}