Question

我对一个非常小的迁移有一个奇怪的问题。

基本信息：我目前有3个项目实例：“Dev PC”（离线），“Dev Laptop”（离线）和“QS”（在线）

所以最近两天我写了三次不同的迁移。一个人使用有关模型的6.000个实例的信息导入JSON文件，并将这些模型写入DB。

第二个（现在是失败的）应该向这些模型写一些新数据，第三个将重写一些数据。

如果这是完美的，不应该在这里讨论。那不介意！

所以继续问题：第二次迁移在QS阶段失败，但在两个Dev阶段都有效。

这是第一个错误

-sh-4.2$ /opt/plesk/php/5.6/bin/php artisan migrate
**************************************
*     Application In Production!     *
**************************************

 Do you really wish to run this command? (yes/no) [no]:
 > yes



  [ErrorException]
  Creating default object from empty value

然后我试了一下

-sh-4.2$ /opt/plesk/php/5.6/bin/php artisan migrate --force --pretend -vvv
6219

  [ErrorException]
  Creating default object from empty value


Exception trace:
 () at /var/www/vhosts/database/migrations/2016_08_25_080129_import_old_adresses.php:28
 Illuminate\Foundation\Bootstrap\HandleExceptions->handleError() at n/a:n/a
 call_user_func() at /var/www/vhosts/vendor/sentry/sentry/lib/Raven/Breadcrumbs/ErrorHandler.php:36
 Raven_Breadcrumbs_ErrorHandler->handleError() at /var/www/vhosts/database/migrations/2016_08_25_080129_import_old_adresses.php:28
 ImportOldAdresses->up() at /var/www/vhosts/vendor/laravel/framework/src/Illuminate/Database/Migrations/Migrator.php:319
 Illuminate\Database\Migrations\Migrator->Illuminate\Database\Migrations\{closure}() at /var/www/vhosts/vendor/laravel/framework/src/Illuminate/Database/Connection.php:656
 Illuminate\Database\Connection->pretend() at /var/www/vhosts/vendor/laravel/framework/src/Illuminate/Database/Migrations/Migrator.php:320
 Illuminate\Database\Migrations\Migrator->getQueries() at /var/www/vhosts/vendor/laravel/framework/src/Illuminate/Database/Migrations/Migrator.php:295
 Illuminate\Database\Migrations\Migrator->pretendToRun() at /var/www/vhosts/vendor/laravel/framework/src/Illuminate/Database/Migrations/Migrator.php:144
 Illuminate\Database\Migrations\Migrator->runUp() at /var/www/vhosts/vendor/laravel/framework/src/Illuminate/Database/Migrations/Migrator.php:117
 Illuminate\Database\Migrations\Migrator->runMigrationList() at /var/www/vhosts/vendor/laravel/framework/src/Illuminate/Database/Migrations/Migrator.php:86
 Illuminate\Database\Migrations\Migrator->run() at /var/www/vhosts/vendor/laravel/framework/src/Illuminate/Database/Console/Migrations/MigrateCommand.php:77
 Illuminate\Database\Console\Migrations\MigrateCommand->fire() at n/a:n/a
 call_user_func_array() at /var/www/vhosts/bootstrap/cache/compiled.php:1257
 Illuminate\Container\Container->call() at /var/www/vhosts/vendor/laravel/framework/src/Illuminate/Console/Command.php:169
 Illuminate\Console\Command->execute() at /var/www/vhosts/vendor/symfony/console/Command/Command.php:256
 Symfony\Component\Console\Command\Command->run() at /var/www/vhosts/vendor/laravel/framework/src/Illuminate/Console/Command.php:155
 Illuminate\Console\Command->run() at /var/www/vhosts/vendor/symfony/console/Application.php:794
 Symfony\Component\Console\Application->doRunCommand() at /var/www/vhosts/vendor/symfony/console/Application.php:186
 Symfony\Component\Console\Application->doRun() at /var/www/vhosts/vendor/symfony/console/Application.php:117
 Symfony\Component\Console\Application->run() at /var/www/vhosts/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php:107
 Illuminate\Foundation\Console\Kernel->handle() at /var/www/vhosts/artisan:36

现在我想看看解雇的SQL：

-sh-4.2$ /opt/plesk/php/5.6/bin/php artisan migrate --force --pretend -vvv
array:2 [
  0 => array:3 [
    "query" => "alter table `orders` add `oldName` varchar(255) not null, add `oldAdress` varchar(255) not null"
    "bindings" => []
    "time" => 0.0
  ]
  1 => array:3 [
    "query" => "select * from `orders` where `orders`.`id` = ? limit 1"
    "bindings" => array:1 [
      0 => 6219
    ]
    "time" => 0.0
  ]
]

现在这很令人困惑，因为在数据库上运行查询select * from订单where订单. id = 6219 limit 1会直接导致1 Entry, Query took 0.0005 seconds.

那么我该怎么做才能调试为什么laravel找不到我的数据库条目？以下是迁移：

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class ImportOldAdresses extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up() {

        Schema::table('orders', function (Blueprint $table) {
            $table->string('oldName');
            $table->string('oldAdress');
        });

        // Load data to be imported.
        $oldOrders = json_decode(File::get('storage/olddata.json'), TRUE);

        // Update.
        foreach ($oldOrders as $rawOrder) {
            $order = \App\Order::find(intval($rawOrder['id'])); // Here's the crash right with the first iteration.

            $order->oldName   = $rawOrder['oldName'];
            $order->oldAdress = $rawOrder['oldAdress'];

            $order->save();
        }
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down() {
        Schema::table('orders', function (Blueprint $table) {
            $table->dropColumn('oldName');
            $table->dropColumn('oldAdress');
        });
    }
}

Answer 1

好的，我实际上不知道在我进行迁移时第一次发生了什么，但进一步的分析回答了他们的问题。从--pretend开始只是模拟查询，Order::find($id)不会返回任何内容。所以发生了错误。

我一遍又一遍地思考并最终再次运行与第一次相同的命令（/opt/plesk/php/5.6/bin/php artisan migrate）并且它有效。

Laravel Migration - Model :: find（$ id）返回NULL但数据库中存在$ id

1 个答案: