How to validate array values?

Question

Laravel

In my Request class, the rules look like this in short:

public function rules()
     {
           $rules = [
               'detail_id' => 'required|array',
           ];

           $detailId = $this->input('detail_id');
           foreach ($detailId as $index => $value){
               $rules["detail_id[".$index."]"] = 'json';
           }

           return $rules;
     }

The rules dump looks like this

array:21 [▼
  "detail_id" => "required|array"
  "detail_id[0]" => "json"
  "detail_id[1]" => "json"
  "detail_id[2]" => "json"
  "detail_id[3]" => "json"
  "detail_id[4]" => "json"
  "detail_id[5]" => "json"
]

Checking if detail_id is an array is done, but no value check is done. How to check?
Below is my research, which did not lead me to the goal, but maybe it will help you to help me.
In the search, I determined that rules () is called from the FormRequest class by the getValidatorInstance method.
Such a dump

dd($factory->make(
            $this->all(), $this->container->call([$this, 'rules']), $this->messages(), $this->attributes()
        ));

looks

Validator {#266 ▼
  #translator: Translator {#100 ▶}
  #presenceVerifier: DatabasePresenceVerifier {#101 ▶}
  #container: Application {#3 ▶}
  #failedRules: []
  #messages: null
  #data: array:5 [▼
    "_method" => "PATCH"
    "_token" => "yKG4oqNtBJmHIDGAYEwepoQZ13NVXsRPEWGV4oPJ"
    "detail_id" => array:6 [▼
      0 => "{"id":6,"base_detail_name":"\u30d7\u30ed\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\uff08\u8ffd\u52a0\u5206\uff09","base_image1":"images\\base_detail\\no-image.jpg","base_image2":"images\\base_detail\\no-image.jpg","base_price":54665,"base_unit":"\u540d","deleted_at":null}"
      1 =>  "{id":...."deleted_at":null}"
      2 =>  "{id":...."deleted_at":null}"
      3 =>  "{id":...."deleted_at":null}"
      4 =>  "{id":...."deleted_at":null}"
      5 =>  "{id":...."deleted_at":null}"
    ]
  ]
  #files: []
  #rules: array:21 [▼
    "detail_id" => array:2 [▼
      0 => "required"
      1 => "array"
    ]
    "detail_id[0]" => array:1 [▼
      0 => "json"
    ]
    "detail_id[1]" => array:1 [▶]
    "detail_id[2]" => array:1 [▶]
    "detail_id[3]" => array:1 [▶]
    "detail_id[4]" => array:1 [▶]
    "detail_id[5]" => array:1 [▶]
  ]
  #after: []
  #customMessages: []
  #fallbackMessages: []
  #customAttributes: []
  #customValues: []
  #extensions: array:6 [▶]
  #replacers: []
  #sizeRules: array:4 [▶]
  #numericRules: array:2 [▶]
  #implicitRules: array:8 [▶]
}

If you need any more data, I'm all ears.
The dimensions of the arrays can sometimes not match, because in the rules () 3 arrays are checked, and I cleaned everything related to them.

Answer 1

$rules = [
    'detail_id' => 'required|array',
    'detail_id.*' => 'json',
];