I have a form to create a new category :

{{ Form::open(['route' => ['category.store'], 'method' => 'POST']) }}
	...
	
	{{ Form::label('is_parent') }}
	{{ Form::checkbox('is_parent') }}
	
	{{ Form::label('parent_id') }}
	{{ Form::select('parent_id', $categories) }}
	
	{{ Form::submit('Create') }}

{{ Form::close() }}

The $categories array contains ['' => 'Not Selected] as first record followed by main categories.

My validation rules :

...
'parent_id' =>  'required_without:is_parent|exists:categories,id,parent_id,null'

Now, when I hit a request with the is_parent selected, it should not check for exists rule. But I still get an error saying : The selected parent id is invalid. Also, the same is the case with unchecked.

Any idea what am I missing ?