驗證值，其中記錄的另一列的值位於值數組中

Question

要驗證的輸入是一棵樹，其中子類別有效，僅當其父類別也已選擇時也是如此。

輸入值如下：

$categories = [1,2,3];

//in database, each subcategory has column "category_id"
$sub_categories = [4,5,6]

驗證方式

$this->validate([
 "sub_categories.*" => [
  "exists:sub_categories,id",
  //Rule for checking that the category_id for this subcategory
  //exists in the categories array.
 ]
])

是否有內置的laravel規則，或者我需要自己編寫規則？

Answer 1

使用Rule類

Validation

$this->validate([
    "sub_categories.*" => [
        "exists:sub_categories,id", 
        \Illuminate\Validation\Rule::in($categories),
    ],
])