Unique validation with category for insert and update in Laravel

I have list of items with related categories (table name is : items)

--- id ------ category_id ----- name
--- 1 ------- 1 ---------------- aa  --> Valid
--- 2 ------- 1 ---------------- bb  --> Valid
--- 3 ------- 2 ---------------- aa  --> Valid
--- 4 ------- 2 ---------------- bb  --> Valid
--- 5 ------- 1 ---------------- aa  --> InValid because same name exist in same category
--- 6 ------- 2 ---------------- bb  --> InValid because same name exist in same category

---

As In Laravel documention

Unique rule will not work here as for category wise, It validates name for all records.

public function validateItems($requestAll){
    $id = isset($requestAll['id']) ? ','.$requestAll['id'].',id':'';
    $rules = [
        'name' => 'required|unique:items,name'.$id,
        'category' => 'required'
    ];
    return Validator::make($requestAll, $rules);
}

How to validate items with related categories for insert and update in Laravel.

via Chebli Mohamed