Answers for "upgrade to laravel 6"

update php version in laravel

"config": {
    "platform": {
        "php": "7.0.7"
    },
    "preferred-install": "dist",
    "optimize-autoloader": true
}

run composer install

laravel update

$flight = App\Models\Flight::find(1);

$flight->name = 'New Flight Name';

$flight->save();

laravel 7 upgrade

$>which composer
/usr/local/bin/composer

$>php -d memory_limit=512M /usr/local/bin/composer update
...