ErrorException CodeIgniter 4 列表中未定义数组键

Question

由于在 Codeigniter 4 中接收到血型外键，我很难在患者表中显示血型描述。

错误发生在

<td><?php echo $p['bt']['description']; ?></td>

显示

ErrorException Undefined array key "bt"

• PacientModel.php

class PacientModel extends Model
{
    ...
    public function bt()
    {
        return $this->belongsTo(BloodTypeModel::class, 'blood_type_id');
    }
}
    

• BloodTypeModel.php

class BloodTypeModel extends Model
{
    ...
    public function blood_type()
    {
        return $this->hasMany(PacientModel::class, 'blood_type_id');
    }
} 

• PacientController.php

    public function index()
    {
        $model = new PacientModel();
        $blood_type = new BloodTypeModel();

        $blood_types = $blood_type->findAll();
        $blood_types = array_column($blood_types, null, 'id');

        $pacients = [
            'pacients' => $model->paginate(10),
            'pager' => $model->pager,
            'blood_types' => $blood_types, 
        ];
        return view('pacient/index', $pacients);
    }

• index.php

  <?php foreach($pacients as $p): ?>
   <tr> 
     <td><?php echo $p['bt']['description']; ?> </td>
   </tr>
  <?php endforeach; ?>

Answer 1

<?php foreach ($pacients['pacients'] as $p): ?>
<tr>
    <td><?php echo $p->bt->description; ?></td>
</tr>