validate exits in laravel rule code example

Example 1: laravel exists validation

'state_id' => 'exists:states,id'

Example 2: validation rule if row exist laravel

//update request 
return [
	'username' => 'unique:users,username,' . $this->route('internalUser')->id . ',id',
];

//create request
return [
	'username' => 'unique:users'
];