lots of improvements

app/Models/ForumThread.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class ForumThread extends Model
+{
+    protected $fillable = [
+        'category_id',
+        'user_id',
+        'title',
+        'slug',
+        'is_sticky',
+        'is_locked',
+        'views',
+        'last_activity_at',
+    ];
+
+    protected $casts = [
+        'is_sticky' => 'boolean',
+        'is_locked' => 'boolean',
+        'last_activity_at' => 'datetime',
+    ];
+
+    /**
+     * Get the category that owns the thread.
+     */
+    public function category()
+    {
+        return $this->belongsTo(ForumCategory::class, 'category_id');
+    }
+
+    /**
+     * Get the user that owns the thread.
+     */
+    public function user()
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    /**
+     * Get the topics for the thread.
+     */
+    public function topics()
+    {
+        return $this->hasMany(ForumTopic::class, 'thread_id');
+    }
+
+    /**
+     * Get the route key for the model.
+     *
+     * @return string
+     */
+    public function getRouteKeyName()
+    {
+        return 'slug';
+    }
+}