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【Laravel】条件付きで必須チェックの組み合わせを実現する。

「hoge 且つ fuga()」 が真の時に、hogeの必須チェックを有効にする

    /**
     * 条件付き必須チェックの組み合わせを実現。
     * @param Validator $validator
     */
    public function withValidator(Validator $validator)
    {
        // 「hoge 且つ fuga」の時には必須チェックを有効にする
        $validator->sometimes('hoge', ['nullable', $this->fuga()], function ($o) {
            return $o->hoge == true;
        });
    }
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