错误号：150“；外键约束的格式不正确Laravel

物品迁移

Schema::create('articles', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('people_id');
            $table->string('title');
            $table->timestamps();
            $table->foreign('author_id')->references('id')->on('people');
        });

人口迁移

Schema::create('people', function (Blueprint $table) {
            $table->increments('id');
            $table->string('first_name');
            $table->string('last_name');
            $table->string('twitter');
            $table->timestamps();
        });

错误

---

我不知道我做错了什么，这两个实体对我来说都是一致的，我不知道我为什么会收到错误150-

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

换行-

$table->foreign('author_id')->references('id')->on('people');

对此-

$table->foreign('people_id')->references('id')->on('people');

---

检查

迁移的顺序。首先运行
people
表迁移，然后运行
articles
表迁移。
这是因为您尚未定义author\u id字段

Schema::create('articles', function (Blueprint $table) {
        $table->increments('id');
        $table->unsignedInteger('author_id');
        $table->string('title');
        $table->timestamps();
        $table->foreign('author_id')->references('id')->on('people');
    });

检查您的人员迁移表是否先运行，然后运行文章迁移（很高兴它有帮助：）
Schema::create('articles', function (Blueprint $table) {
        $table->increments('id');
        $table->unsignedInteger('author_id');
        $table->string('title');
        $table->timestamps();
        $table->foreign('author_id')->references('id')->on('people');
    });