Added quiz features

app/Models/Quiz.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Quiz extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'category_id',
+        'title',
+        'slug',
+        'year',
+        'type',
+        'duration_minutes',
+        'has_negative_score',
+        'is_free',
+        'is_published',
+        'description',
+    ];
+
+    protected $casts = [
+        'year' => 'integer',
+        'duration_minutes' => 'integer',
+        'has_negative_score' => 'boolean',
+        'is_free' => 'boolean',
+        'is_published' => 'boolean',
+    ];
+
+    public function category()
+    {
+        return $this->belongsTo(QuizCategory::class, 'category_id');
+    }
+
+    public function questions()
+    {
+        return $this->hasMany(Question::class, 'quiz_id')->orderBy('order');
+    }
+
+    public function attempts()
+    {
+        return $this->hasMany(UserQuizAttempt::class, 'quiz_id');
+    }
+}