Question

尝试插入belongsToMany关系：

$currentPerson->fbevents()->attach($currentEvent);

$ currentPerson是：

{
    "name": "xxxx",
    "userId": "yyyyyyy",
    "pictureUrl": "zzzzz"
}

显示$ currentPerson没有ID，即使它已被$currentPerson->save();

插入数据库

所以，我想问题是如何在数据透视表中获得正确的条目？模型是这样的：

user.php的：

public function fbevents()
{
    return $this->belongsToMany('Fbevent', 'fbevent_user');
}

Fbevent.php：

public function users()
{
    return $this->belongsToMany('User', 'fbevent_user');
}

$ currentPerson的类型为User，$ currentEvent的类型为Fbevent。

目前我收到以下错误：

SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (`dmf`.`fbevent_user`, CONSTRAINT `fbevent_user_fbevent_id_foreign` FOREIGN KEY (`fbevent_id`) REFERENCES `fbevents` (`id`) ON DELETE CASCADE) (SQL: insert into `fbevent_user` () values ())

迁移架构：

Schema::create('users', function(Blueprint $table) {
    $table->increments('id');
    $table->string('userId');
    $table->string('name');
    $table->string('pictureUrl');
    $table->timestamps();
});

Schema::create('fbevents', function(Blueprint $table) {
    $table->increments('id');
    $table->string('eventId');
    $table->string('pageId');
    $table->string('title');
    $table->string('description', 500);
    $table->datetime('start');
    $table->datetime('end');
    $table->string('picture');
    $table->timestamps();
});

fbevent_user：

Schema::create('fbevent_user', function(Blueprint $table) {
    $table->increments('id');
    $table->integer('fbevent_id')->unsigned()->index();
    $table->foreign('fbevent_id')->references('id')->on('fbevents')->onDelete('cascade');
    $table->integer('user_id')->unsigned()->index();
    $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
    $table->timestamps();
});

Answer 1

只需将attach()替换为save()

$currentPerson->save();
$currentPerson->fbevents()->save($currentEvent);

试图插入belongsToMany关系

1 个答案: