Question

我的laravel 5.6项目中存在多对多关系的问题。我已经有了一些不同的多对多关系，但我无法找到这个问题。我已经尝试过google和stackoverflow，但无法找到答案。

所以，我有3张桌子;球员，球队和球员_in_teams 我想展示一名球员和他所参加的所有球队。

这是我的（简单）表格布局：

小组 - ID - teamName

球员 - ID - 名字 - lastName

PlayersInTeams - ID - FKplayerID - FKteamID

我的代码：

Player.php：

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Player extends Model
{
protected $fillable = [
    'firstName', 'lastName'
];

public function teams() {
    return $this->belongsToMany('App\PlayersInTeam', 'players_in_teams', 'FKteamID', 'FKplayerID');
}
}

Team.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Team extends Model
{
protected $fillable = ['FKuserID', 'teamName', 'teamDescription', 'FKmediaID'];

public function players(){
    return $this->belongsToMany('App\PlayersInTeam', 'players_in_teams', 'FKteamID', 'FKplayerID');
}
}

PlayersInTeam.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class PlayersInTeam extends Model
{
protected $fillable = ['FKteamID', 'FKplayerID'];
}

PlayerController.php

public function index()
{
    $players = Player::all();
    return view('players.index', compact('players', $players));
}

showplayer.blade.php

<li>{{ $player->firstName.' '.$player->lastName }}</li>
<li>{{ $player->id }}</li>
@if($player->teams)
  <li>{{ $player->teams->id }}</li>
@endif

我收到的完整错误：

SQLSTATE [42000]：语法错误或访问冲突：1066不唯一的表/别名：＆＃39; players_in_teams＆＃39; （SQL：选择players_in_teams。*，players_in_teams。FKteamID为pivot_FKteamID，players_in_teams。FKplayerID为pivot_FKplayerID来自{{ 1}}内部联接players_in_teams位于players_in_teams。players_in_teams = id。players_in_teams其中FKplayerID。players_in_teams = 1）（查看：../ resources / views / players / showplayer.blade.php）

如果希望有人看到我失踪的东西，

提前致谢！

Answer 1

功能的参数设置为数据透视表。您应该将它们设置为最终模型。试试这个：

public function teams() {
    return $this->belongsToMany('App\Team', 'players_in_teams', 'FKplayerID', 'FKteamID');
}

public function players(){
    return $this->belongsToMany('App\Player', 'players_in_teams', 'FKteamID', 'FKplayerID');
}

Answer 2

我会确保您的迁移中加入表上的外键已正确设置。像这样：

$table->foreign('FKplayerID')->references('id')->on('players')->onDelete('cascade')->onUpdate('cascade');
$table->foreign('FKteamID')->references('id')->on('teams')->onDelete('cascade')->onUpdate('cascade');

Laravel 5.6 - 雄辩许多错误1066

2 个答案: