atk4\data\tests\ReferenceTest::testBasicReferences PHP Method

    public function testBasicReferences()
    {
        $user = new Model(['table' => 'user']);
        $user->addField('name');
        $user->id = 1;
        $order = new Model();
        $order->addField('amount', ['default' => 20]);
        $order->addField('user_id');
        $user->hasMany('Orders', $order);
        $o = $user->ref('Orders');
        $this->assertEquals(20, $o['amount']);
        $this->assertEquals(1, $o['user_id']);
        $user->hasMany('BigOrders', function () {
            $m = new Model();
            $m->addField('amount', ['default' => 100]);
            $m->addField('user_id');
            return $m;
        });
        $this->assertEquals(100, $user->ref('BigOrders')['amount']);
    }