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app/Models/MessageModel.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class MessageModel extends Model
+{
+    //
+    protected $table = 'nl_messages';
+    protected $primaryKey = 'id';
+    public $timestamps = false;
+    protected $guarded = [];
+
+    public function user()
+    {
+        return $this->hasOne(UserModel::class, 'id', 'user_id');
+    }
+    public function toUser()
+    {
+        return $this->hasOne(UserModel::class, 'id', 'to_user_id');
+    }
+}