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Modules/Admin/app/Models/PromotionDemotion.php

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+<?php
+
+namespace Modules\Admin\Models;
+
+use App\Observers\PromotionDemotionObserver;
+use Illuminate\Database\Eloquent\Attributes\ObservedBy;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Modules\Employee\Models\Employee;
+
+#[ObservedBy([PromotionDemotionObserver::class])]
+class PromotionDemotion extends Model
+{
+    use HasFactory;
+
+    protected $table = "tbl_promotion_demotions";
+    
+    /**
+     * The attributes that are mass assignable.
+     */
+    protected $fillable = [
+        'employee_id',
+        'title',
+        'type',
+        'old_designation_id',
+        'new_designation_id',
+        'status',
+        'description',
+        'remarks',
+    ];
+
+    public function employee()
+    {
+        return $this->belongsTo(Employee::class, 'employee_id');
+    }
+
+    public function oldDesignation()
+    {
+        return $this->belongsTo(Designation::class, 'old_designation_id')->withDefault(['name' => '-']);
+    }
+
+    public function newDesignation()
+    {
+        return $this->belongsTo(Designation::class, 'new_designation_id')->withDefault(['name' => '-']);
+    }
+}