PHP Laravel PDOException 外键约束中引用列和被引用列的一般错误不兼容

Question

我目前正在通过终端在 Laravel 中进行迁移，并且在尝试使用 php artisan migrate 时出现这两个错误；我将在下面打印错误:

Exception trace:

  1   PDOException::("SQLSTATE[HY000]: General error: 3780 Referencing column 'room_id' and referenced column 'id' in foreign key constraint 'contacts_room_id_foreign' are incompatible.")
      /Users/shaquilenoor/Desktop/chatapi/vendor/laravel/framework/src/Illuminate/Database/Connection.php:458

  2   PDOStatement::execute()
      /Users/shaquilenoor/Desktop/chatapi/vendor/laravel/framework/src/Illuminate/Database/Connection.php:458

根据异常跟踪中包含的代码，问题似乎出在以下代码中:

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

class CreateContactsTable extends Migration
{
    public function up()
    {
        Schema::create('contacts', function (Blueprint $table) {
            $table->increments('id');
            $table->unsignedInteger('user1_id');
            $table->unsignedInteger('user2_id');
            $table->integer('room_id')->unique();
            $table->timestamps();
            $table->foreign('room_id')->references('id')->on('rooms');
            $table->foreign('user1_id')->references('id')->on('users');
            $table->foreign('user2_id')->references('id')->on('users');
        });
    }

    public function down()
    {
        Schema::dropIfExists('contacts');
    }
}

关于我如何解决的任何想法？

Answer 1

这是因为在创建 rooms 表之前设置了外键。您可以通过执行以下操作来解决此问题。

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

class CreateContactsTable extends Migration
{
    public function up()
    {
        Schema::disableForeignKeyConstraints();
        Schema::create('contacts', function (Blueprint $table) {
            $table->increments('id');
            $table->unsignedInteger('user1_id');
            $table->unsignedInteger('user2_id');
            $table->integer('room_id')->unique();
            $table->timestamps();
            $table->integer('room_id')->unsigned();
            $table->integer('user1_id')->unsigned();
            $table->integer('user2_id')->unsigned();
            $table->foreign('room_id')->references('id')->on('rooms');
            $table->foreign('user1_id')->references('id')->on('users');
            $table->foreign('user2_id')->references('id')->on('users');
        });
        Schema::enableForeignKeyConstraints();
    }

    public function down()
    {
        Schema::disableForeignKeyConstraints();
        Schema::dropIfExists('contacts');
        Schema::enableForeignKeyConstraints();
    }
}