rdb-demo/tryGetFirstEager.js

ORM examples for npmjs.org/package/rdb

let rdb = require('rdb');
let resetDemo = require('./db/resetDemo');

let Customer = rdb.table('_customer');
let Order = rdb.table('_order');

Customer.primaryColumn('cId').guid().as('id');
Customer.column('cName').string().as('name');

Order.primaryColumn('oId').guid().as('id');
Order.column('oOrderNo').string().as('orderNo');
Order.column('oCustomerId').guid().as('customerId');

Order.join(Customer).by('oCustomerId').as('customer');

let db = rdb('postgres://rdb:rdb@localhost/rdbdemo');

module.exports = async function() {
    try {
        await resetDemo();
        await db.transaction(async () => {
            let filter = Order.customer.name.equal('John');
            let strategy = { customer: null };
            let order = await Order.tryGetFirst(filter, strategy);
            if (order)
                console.log(await order.toDto());
        });
    } catch (e) {
        console.log(e.stack);
    }
}();