eCert-MBIP/app/Models/CertificateTemplate.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class CertificateTemplate extends Model
{
    protected $fillable = [
        'program_id', 'original_filename', 'image_path', 'config_json', 'is_active', 'uploaded_by',
    ];

    protected function casts(): array
    {
        return [
            'config_json' => 'array',
            'is_active'   => 'boolean',
        ];
    }

    public function program()
    {
        return $this->belongsTo(Program::class);
    }

    public function uploader()
    {
        return $this->belongsTo(User::class, 'uploaded_by');
    }

    public function certificates()
    {
        return $this->hasMany(Certificate::class);
    }

    public function getFieldConfig(string $field): ?array
    {
        return $this->config_json['fields'][$field] ?? null;
    }
}