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app/Models/TravelRequest.php

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+<?php
+
+namespace App\Models;
+
+use App\Enums\EventType;
+use App\Enums\GeneralType;
+use App\Enums\TravelStatus;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class TravelRequest extends Model
+{
+    /** @use HasFactory<\Database\Factories\TravelRequestFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'user_id',
+        'workflow_id',
+        'status',
+        'reason_summary',
+        'event_type',
+        'general_type',
+        'needs_accommodation',
+        'needs_car_hire',
+        'vehicle_policy_acknowledged',
+        'business_days',
+        'private_days',
+        'additional_notes',
+        'submitted_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'status' => TravelStatus::class,
+            'event_type' => EventType::class,
+            'general_type' => GeneralType::class,
+            'needs_accommodation' => 'boolean',
+            'needs_car_hire' => 'boolean',
+            'vehicle_policy_acknowledged' => 'boolean',
+            'submitted_at' => 'datetime',
+        ];
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function workflow(): BelongsTo
+    {
+        return $this->belongsTo(ApprovalWorkflow::class, 'workflow_id');
+    }
+
+    public function journeys(): HasMany
+    {
+        return $this->hasMany(TravelJourney::class);
+    }
+
+    public function costCodes(): HasMany
+    {
+        return $this->hasMany(TravelCostCode::class);
+    }
+
+    public function approvals(): HasMany
+    {
+        return $this->hasMany(TravelRequestApproval::class);
+    }
+}