Add endpoint and backend for managing postcode

app/Poskod.php

@@ -3,10 +3,12 @@
 namespace App;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
 class Poskod extends Model
 {
     protected $table = 'poskod';
+    protected $primaryKey = 'recno';
     public $timestamps = false;
 
     /**
@@ -26,4 +28,13 @@ class Poskod extends Model
      * @var array
      */
     // protected $hidden = [];
+
+    public function negeri(): BelongsTo {
+        return $this->belongsTo(Negeri::class, 'kodnegeri', 'kodnegeri');
+    }
+
+
+    public function daerah(): BelongsTo {
+        return $this->belongsTo(Daerah::class, 'koddaerah', 'koddaerah');
+    }
 }