我正在努力在拉腊维尔保存许多人。我已经试了将近7个小时了。但是仍然不能解决这个问题。
下面是自定义迁移表：

public function up()
    {
        Schema::create('customer', function (Blueprint $table) {
            $table->id();
            $table->timestamps();
            $table->string("customer_phone", 255);
        });
    }

下面是我的send_messages迁移表：

public function up()
    {
        Schema::create('send_messages', function (Blueprint $table) {
            $table->id();
            $table->timestamps();
            $table->unsignedBigInteger("template_id");
            $table->unsignedBigInteger("sender_number_id");
            // $table->unsignedBigInteger("cutomer_id");
            $table->foreign("template_id")->references("id")->on("messagecontent")->onDelete("cascade");
            $table->foreign("sender_number_id")->references("id")->on("sendernumber")->onDelete("cascade");
           // $table->foreign("customer_id")->references("id")->on("customer")->onDelete("cascade");

        });
    }

下面是我的数据透视表：

Schema::create('customer_send_message', function (Blueprint $table) {
    $table->id();
    $table->timestamps();
    $table->foreignId("send_messages_id")->constrained("send_messages");
    $table->foreignId("customer_id")->constrained("customer");
});

这里是客户模型

class Customer extends Model
{
    use HasFactory;

    protected $table = "customer";

    protected $fillable = [ "customer_phone" ];

    public function sendmessage () {
        return $this->belongsToMany(SendMessage::class, "customer_send_message");
    }

}

这是我的发送消息模型

class SendMessage extends Model
{
    use HasFactory;

    protected $table = "send_messages";

    protected $fillable = [
        "customer_id",
        "template_id",
        "sender_number_id"
    ];

    public function messageContent() {
        return $this->belongsTo(MessageContentModel::class);
    }

    public function senderNumber() {
        return $this->belongsTo(SendNumberModel::class);
    }

    public function customer() {
        return $this->belongsToMany(Customer::class, "customer_send_message");
    }

}

下面是我尝试保存的控制器：

public function send(Request $request) {
        $sendmessage = new SendMessage();

        $sendmessage->template_id = $request->get("template_id");
        $sendmessage->sender_number_id = $request->get("sender_number_id");

        $customers = Customer::find(1);
        $sendmessage->customer()->attach($customers);
        $sendmessage->save();
//        $send->save();
        return redirect("")->with("message", "Sms sent!");
    }

我想得到多个数据，然后我想保存它就像django manytomanyfield.实际上我是一个django开发者，我最近切换到laravel.我不知道这么多的事情.所以有什么解决这个问题的方法吗？我只想保存.
保存时出现错误：
状态[42 S22]：未找到列：1054“字段清单”中有不明的数据行“send_message_id”
我不知道为什么我得到这个错误！！