Question

我正在尝试使用Laravel 5.3和mysql跟踪半私人网球课程记录。我试图按照Laravel 5多对多教程中的示例设置。我有一个玩家模型，我试图通过Player_Sharedlessonhours数据透视表与Sharedlessonhours表同步。在代码中，我的sharedlessonhours表获取插入的记录，但数据透视表没有。很抱歉这么详细，但我想清楚发生了什么。

首先是表格结构。

     public function up()
{
    Schema::create('sharedlessonhours', function (Blueprint $table) {
        $table->increments('id');
        $table->date('signup_date');
        $table->integer('packages_id')->unsigned();
        $table->timestamps();


    });

     Schema::table('sharedlessonhours', function (Blueprint $table) {
         $table->foreign('packages_id')->references('id')->on('packages');
     });


    Schema::create('player_sharedlessonhour', function (Blueprint $table) 
    {
        $table->integer('sharedlessonhours_id')->unsigned();
        $table->integer('players_id')->unsigned();
        $table->timestamps();


    });

    Schema::table('player_sharedlessonhour', function (Blueprint $table) {
        $table->foreign('sharedlessonhours_id')->references('id')->on('sharedlessonhours')->onDelete('cascade');
          $table->foreign('players_id')->references('id')->on('players')->onDelete('cascade');

     });
}

创建和存储方法：

    public function createSharedLessonhours()
{
    $players = Players::orderBy('lname')->pluck('fname', 'id');
    $packages = Packages::orderBy('name')->pluck('name','id');
    return view('admin.lessonhours.sharedlessonhours', compact('players', 'packages'));
}

public function storeSharedLessonhours(Request $request)
{
   $sharedlessonhours = SharedLessonhours::create($request->all());

   $sharedlessonhours->players()->attach($request->input('players'));
}

表格：

        <div class="col-md-4 col-sm-5">
    {!! Form::open(['url' => 'sharedlessonhours']) !!}
    <div class="form-group">
        {!! Form::label('players', 'Player(s):') !!}
        {!! Form::select('players[]', $players, null, ['class' => 'form-control', 'multiple']) !!}
    </div>
    <div class="form-group">
        {!! Form::label('signup_date', 'Signup Date:') !!}
        {!! Form::text('signup_date', null, ['class' => 'form-control']) !!}
    </div>
    <div class="form-group">
        {!! Form::label('packages_id', 'Lesson Package:') !!}
        {!! Form::select('packages_id', $packages, null, ['class' => 'form-control', 'placeholder' => 'Choose Package']) !!}
    </div>

    <div class="form-group">
        {!! Form::submit('Signup', ['class' => 'btn btn-default form-control']) !!}
    </div>

{!! Form::close() !!}
</div>

播放器ID的选择框的屏幕截图：

错误的屏幕截图：

我想知道数组是否只是错误的顺序？ dd（$ request）显示所有内容都是从表单中收集的，但是查看错误页面似乎是在尝试将数据插入到错误的字段中。如果对mysql有意义，那么具有（3,4）的行将不是正确的顺序。我尝试在mysql中翻转列，但它没有帮助。我现在很困惑。

更新：首先，我将分享所请求的代码，然后分享我已经采取的调试步骤。

玩家型号代码：

namespace App;

use Illuminate\Database\Eloquent\Model;
use Collective\Html\Eloquent\FormAccessible;
use Carbon\Carbon;


class Players extends Model
{
    public $table = "players";

    protected $fillable = array('fname', 'lname', 'gender', 'birthdate');


    public function users()
    {
        return $this->belongsTo('App\User', 'users_id');
    }

    public function lessonHours()
    {
        return $this->hasMany('App\Lessonhours', 'players_id');
    }

    public function sharedlessonhours()
    {
             return $this->belongsToMany('App\SharedLessonhours',            "player_sharedlessonhour","players_id", "sharedlessonhours_id" );
    }

    public function getFullName($id)
    {
        return ucfirst($this->fname ) . ' ' . ucfirst($this->lname);
    }

    protected $dates = ['birthdate'];

    public function setBirthdateAttribute($value)
    {
        $this->attributes['birthdate'] = Carbon::createFromFormat('m/d/Y',     $value);
    }
}

SharedLessonhours：

    <?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use Collective\Html\Eloquent\FormAccessible;
use Carbon\Carbon;

class SharedLessonhours extends Model
{
    use FormAccessible;

    protected $fillable = array('signup_date', 'packages_id');

    public $table = "sharedlessonhours";

    public function players()
    {
        return $this->belongsToMany('App\Players',     "player_sharedlessonhour", "players_id", "sharedlessonhours_id");
    }

    public function sharedhoursused()
    {
        return $this->hasMany('App\SharedHoursused', 'id');
    }

    public function packages()
    {
        return $this->belongsTo('App\Packages');
    }

    public function setSignUpDateAttribute($value)
    {
        $this->attributes['signup_date'] = Carbon::createFromFormat('m/d/Y',     $value);
    }
}

我尝试在更改mysql中的列后添加不同的记录并再次获取错误。在重新启动修补程序之后，我将列重新切换回来并继续错误。

Answer 1

除了自定义连接表的名称之外，您还可以通过将其他参数传递给belongsToMany方法来自定义表上键的列名。第三个参数是您定义关系的模型的外键名称，而第四个参数是您要加入的模型的外键名称

来自多对多关系的laravel文档。

因此，players模型中SharedLessonhour关系的定义应为

public function players()
{
    return $this->belongsToMany('App\Players',  "player_sharedlessonhour", "sharedlessonhours_id",  "players_id");
}

尝试更改定义并查看。我没有测试，但这似乎是违反约束的原因。

如何插入数据透视表

1 个答案: