codigo actual del servidor, con avances de joan

app/Models/Conversation.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Conversation extends Model
+{
+    public function messages(){
+        return $this->hasMany(Message::class);
+    }
+
+    public function sender(){
+        return $this->belongsTo(User::class, 'sender_id');
+    }
+
+    public function receiver(){
+        return $this->belongsTo(User::class, 'receiver_id');
+    }
+}