迁移返回错误中的laravel外键

Question

迁移运行时出现严重错误

(errno: 150 "外键约束格式不正确")

主键和外键的所有字段都具有相同的数据主键

它们都是无符号大整数

Schema::create('users', function (Blueprint $table) {
              $table->bigIncrements('id');
            $table->string('name');
            $table->string('email',100)->unique();
            $table->timestamp('email_verified_at')->nullable();
            $table->string('password');
            $table->integer('rank');
            $table->rememberToken();
            $table->timestamps();
        });



 Schema::create('products', function (Blueprint $table) {
          $table->bigIncrements('id');
          $table->unsignedBigInteger('user_id');

          $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');

    });

Answer 1

你可以这样做

$table->foreignId('user_id')
      ->constrained()
      ->onDelete('cascade');