laravel validation unique email

'email' => 'unique:users,email_address,'.$user->id

'email' => 'required|email|unique:users,email',
//@sujay

/**
 * Store a new blog post.
 *
 * @param  Request  $request
 * @return Response
 */

public function store(Request $request)
{
    $validatedData = $request->validate([
        'title' => 'required|unique:posts|max:255',
        'body' => 'required',
    ]);

    // The blog post is valid...
}

'user.email' => 'required|email|unique:users,email,'.$user->id,
//@sujay