Laravel8 不对迁移创建外键约束

Question

我正在与 Laravel8 合作。我有两个表 contact_lists 和 contacts

我contact_lists有很多contacts。

这是我在 contact_lists

上生成外键约束的迁移代码

public function up()
   {
      Schema::create('contacts', function (Blueprint $table) {
         $table->id();
         $table->unsignedBigInteger('user_id');
         $table->foreignId('contact_list_id')->nullable()->constrained()->onDelete('cascade');
         $table->string('first_name');
         $table->string('last_name');
         $table->string('phone');
         $table->longText('organization')->nullable();
         $table->longText('note')->nullable();
         $table->timestamps();
      });
   }

但是我不知道为什么没有生成外键。

Answer 1

Laravel 使用 MyISAM 作为默认的 mysql 存储引擎。所以请确保 config/database/

'engine' => 'InnoDB'

默认：

'mysql' => [
                'driver' => 'mysql',
                'url' => env('DATABASE_URL'),
                'host' => env('DB_HOST', '127.0.0.1'),
                'port' => env('DB_PORT', '3306'),
                'database' => env('DB_DATABASE', 'forge'),
                'username' => env('DB_USERNAME', 'forge'),
                'password' => env('DB_PASSWORD', ''),
                'unix_socket' => env('DB_SOCKET', ''),
                'charset' => 'utf8mb4',
                'collation' => 'utf8mb4_unicode_ci',
                'prefix' => '',
                'prefix_indexes' => true,
                'strict' => true,    
                'engine' => null,
                'options' => extension_loaded('pdo_mysql') ? array_filter([
                    PDO::MYSQL_ATTR_SSL_CA => env('MYSQL_ATTR_SSL_CA'),
                ]) : [],
            ],

更新：

'mysql' => [
            'driver' => 'mysql',
            'url' => env('DATABASE_URL'),
            'host' => env('DB_HOST', '127.0.0.1'),
            'port' => env('DB_PORT', '3306'),
            'database' => env('DB_DATABASE', 'forge'),
            'username' => env('DB_USERNAME', 'forge'),
            'password' => env('DB_PASSWORD', ''),
            'unix_socket' => env('DB_SOCKET', ''),
            'charset' => 'utf8mb4',
            'collation' => 'utf8mb4_unicode_ci',
            'prefix' => '',
            'prefix_indexes' => true,
            'strict' => true,    
            'engine' => 'InnoDB',
            'options' => extension_loaded('pdo_mysql') ? array_filter([
                PDO::MYSQL_ATTR_SSL_CA => env('MYSQL_ATTR_SSL_CA'),
            ]) : [],
        ],

Laravel8 不对迁移创建外键约束

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