Laravel MariaDB errno:150 "Foreign key constraint is incorrectly formed"

Question

我的帖子迁移是：

        Schema::create('posts', function (Blueprint $table) {
        $table->increments('id');
        $table->string('channel_id');
        $table->foreign('channel_id')->references('id')->on('channels');
        $table->string('title');
        $table->text('content');
        $table->string('status')->default('published');
        $table->string('type');
        $table->string('published_at');
        $table->timestamps();
    });

和频道：

        Schema::create('channels', function (Blueprint $table) {
        $table->increments('id');
        $table->string('name');
        $table->string('description');
        $table->string('channel_id');
        $table->timestamps();
    });

现在，当我执行 php artisan migrate 时出现以下错误消息：

  [Illuminate\Database\QueryException]
  SQLSTATE[HY000]: General error: 1005 Can't create table `TBL_NAME`.`#sql-
  2221_1f76c` (errno: 150 "Foreign key constraint is incorrectly formed") (SQ
  L: alter table `posts` add constraint `posts_channel_id_foreign` foreign ke
  y (`channel_id`) references `channels` (`id`))


  [PDOException]
  SQLSTATE[HY000]: General error: 1005 Can't create table `TBL_NAME`.`#sql-
  2221_1f76c` (errno: 150 "Foreign key constraint is incorrectly formed")

我正在使用 Laravel 5.3，并且迁移在我使用 MySQL 的本地计算机上完美运行。但是当我在服务器上上传我的 Laravel 项目并在服务器上使用 MariaDB 时。我看到了那个错误信息。

Answer 1

在 posts table 迁移中更改此：

$table->string('channel_id');

为此：

$table->integer('channel_id')->unsigned();

此外，请确保在 posts table 迁移之前运行 channels table 迁移。

Laravel MariaDB errno:150 "Foreign key constraint is incorrectly formed"

Laravel MariaDB errno:150 "Foreign key constraint is incorrectly formed"

mysql

mariadb

laravel

laravel-5.3