Question

模型中的多对多关系

  public function drycleanings()
    {
      return $this->belongsToMany('App\drycleaning')
      ->withPivot('$cart_id','drycleaning_id','q_drycleaning_id');
    }

和

  public function carts()
  {
    return $this->belongsToMany('App\cart')
    ->withPivot('$cart_id','drycleaning_id','q_drycleaning_id');
  }

在我正在使用的控制器中

$cart->drycleanings()->attach($request->drycleaning_id,[$request->q_drycleaning_id]);

如果给我一个错误

SQLSTATE [42S22]：未找到列：1054未知列＆＃39; 0＆＃39;在＆＃39;字段列表＆＃39;

dd的结果（$ request-＆gt; all（））;

"drycleaning_id" => array:2 [▼
    0 => "3"
    1 => "4"
  ]
  "q_drycleaning_id" => array:58 [▼
    0 => "2"
    1 => "2"
    2 => null
    3 => null
    4 => null
    5 => null
    6 => null
    7 => null
    8 => null
    9 => null
    10 => null
  ]

cart_drycleaning table的迁移

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateCartDrycleaningTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('cart_drycleaning', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('cart_id');
            $table->integer('drycleaning_id');
            $table->integer('q_drycleaning_id');
            $table->timestamps();
        });
    }

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

如果我只使用$cart->drycleanings()->attach($request->drycleaning_id); 然后将cart_id和drycleaning_id存储到关联/数据透视表中（表名：cart_drycleaning）

我正在尝试保存q_drycleaning_id（表示项目数量）作为用户的输入。

有什么办法我只能传递非空值吗？或任何其他解决方案，以保存到关联表？

很多很多。在将额外的列保存到数据库时获取错误

0 个答案: