request.php

<?php

// passing array.
public function store(Request $request)
{
	$data = $request->all();
	//array_set, array_add and others way.
	array_set($data, 'status', 'draft');

	// accept array.
	$this->postSevice->create($data);
}

// passing Request.
public function store(Request $request)
{
  	$request->request->set('status', 'draft');
  	
  	// Instance of Request
	$this->postSevice->create($request);
}

// set request layer, weird

class PostRequest extends FormRequest
{
	public function rules()
	{
		$request->request->set('status', 'draft');

		return [
		    //
		];
	}
}