Php Laravel：如何在表4中显示属于1模型的不同命名列

我在add_members表中有4列：activitive_id_1、activitive_id_2、activitive_id_3和activitive_id_4。它们都属于活动家模式：

public function members()
    {
        return $this->hasMany('App\AddMember', 'activist_id_1', 'activist_id_2', 'activist_id_3', 'activist_id_4');
    }

添加成员模型：

public function activist()
    {
        return $this->belongsTo('App\Activist', 'activist_id_1', 'activist_id_2', 'activist_id_3', 'activist_id_4');
    }

如果我尝试这样显示表：

<td>{{$add_member->activist_id_1 ? $add_member->activist_id_1->name : ''}}</td>
<td>{{$add_member->activist_id_2 ? $add_member->activist_id_2->name : ''}}</td>
<td>{{$add_member->activist_id_3 ? $add_member->activist_id_3->name : ''}}</td>
<td>{{$add_member->activist_id_4 ? $add_member->activist_id_4->name : ''}}</td>

<td>{{$add_member->activist1->name or ''}}</td>
<td>{{$add_member->activist2->name or ''}}</td>

方法为的地方有很多，但总是出错

---

如何解决此问题？

您应该为每个活动id创建一个函数。例如：

public function activist1()
{
    return $this->belongsTo('App\Activist', 'activist_id_1');
}

public function activist2()
{
    return $this->belongsTo('App\Activist', 'activist_id_2');
}

然后这样称呼他们：

<td>{{$add_member->activist_id_1 ? $add_member->activist_id_1->name : ''}}</td>
<td>{{$add_member->activist_id_2 ? $add_member->activist_id_2->name : ''}}</td>
<td>{{$add_member->activist_id_3 ? $add_member->activist_id_3->name : ''}}</td>
<td>{{$add_member->activist_id_4 ? $add_member->activist_id_4->name : ''}}</td>

<td>{{$add_member->activist1->name or ''}}</td>
<td>{{$add_member->activist2->name or ''}}</td>

{{$add_member->activist1->name或''>}
{{$add_member->activist2->name或''}}

---

此外，在Blade中，您可以使用括号内的

或
来避免空关系。
每个活动者都与一个函数相关，
您有
AddMember
型号：

public function activist1()
{
    return $this->belongsTo('App\Activist', 'activist_id_1');
}

public function activist2()
{
    return $this->belongsTo('App\Activist', 'activist_id_2');
}
public function activist3()
{
    return $this->belongsTo('App\Activist', 'activist_id_3');
}

public function activist4()
{
    return $this->belongsTo('App\Activist', 'activist_id_4');
}

显示表：

<td>{{$add_member->activist1->name or ''}}</td>
<td>{{$add_member->activist2->name or ''}}</td>
<td>{{$add_member->activist3->name or ''}}</td>
<td>{{$add_member->activist4->name or ''}}</td>

{{$add_member->activist1->name或''>}
{{$add_member->activist2->name或''}}
{{$add_member->activist3->name或''}}
{{$add_member->activist4->name或''}}

我不知道为什么我认为它可以用一种方法完成所有事情，而不必更多：）是的，这很有效，谢谢@Laerte；）