验证值，其中记录的另一列的值位于值数组中

Question

要验证的输入是一棵树，其中子类别有效，仅当其父类别也已选择时也是如此。

输入值如下：

$categories = [1,2,3];

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

验证方式

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

是否有内置的laravel规则，或者我需要自己编写规则？

Answer 1

使用Rule类

Validation

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