initial

app/Models/TravelRequestApproval.php

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+<?php
+
+namespace App\Models;
+
+use App\Enums\ApprovalStatus;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class TravelRequestApproval extends Model
+{
+    /** @use HasFactory<\Database\Factories\TravelRequestApprovalFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'travel_request_id',
+        'approval_step_id',
+        'approver_id',
+        'status',
+        'comments',
+        'acted_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'status' => ApprovalStatus::class,
+            'acted_at' => 'datetime',
+        ];
+    }
+
+    public function travelRequest(): BelongsTo
+    {
+        return $this->belongsTo(TravelRequest::class);
+    }
+
+    public function step(): BelongsTo
+    {
+        return $this->belongsTo(ApprovalStep::class, 'approval_step_id');
+    }
+
+    public function approver(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'approver_id');
+    }
+}