SQLSTATE[HY000]: General error: 1005 Can't create table `Data`.`company_eligibilities` (errno: 150 "Foreign key constraint is incorrectly formed")

Question

 public function up()
    {
        Schema::create('company_eligibilities', function (Blueprint $table) {
            $table->id();
            $table->string('marks');
            $table->integer('company_id')->unsigned();
            $table->timestamps();

            $table->foreign('company_id')
                ->references('id')->on('companies')
                ->onDelete('cascade')
                ->onUpdate('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('company_eligibilities');
    }

执行上述迁移之前公司迁移已经完成

当我尝试创建 table 和外键时出现上述错误。我是不是做错了什么？？

Answer 1

确保在迁移 companies 之前迁移 companies，将外键 ID 更改为 unsigned big integer, Laravel 5.8 将默认外键设置为unsigned big integer, 6.x and ]7.x :

$table->bigInteger('company_id')->unsigned();

或者，

$table->unsignedBigInteger('company_id');

SQLSTATE[HY000]: General error: 1005 Can't create table `Data`.`company_eligibilities` (errno: 150 "Foreign key constraint is incorrectly formed")

SQLSTATE[HY000]: General error: 1005 Can't create table `Data`.`company_eligibilities` (errno: 150 "Foreign key constraint is incorrectly formed")

laravel

laravel-migrations

laravel-7