lots of improvements

app/Models/ForumPost.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class ForumPost extends Model
+{
+    protected $fillable = [
+        'topic_id',
+        'user_id',
+        'content',
+        'is_solution',
+        'edited_at',
+    ];
+
+    protected $casts = [
+        'is_solution' => 'boolean',
+        'edited_at' => 'datetime',
+    ];
+
+    /**
+     * Get the topic that owns the post.
+     */
+    public function topic()
+    {
+        return $this->belongsTo(ForumTopic::class, 'topic_id');
+    }
+
+    /**
+     * Get the user that owns the post.
+     */
+    public function user()
+    {
+        return $this->belongsTo(User::class);
+    }
+}