ProjectDDD/Assets/_DDD/_Scripts/GameState/InventoryItemData.cs

using System;
using UnityEngine;

namespace DDD
{
    [Serializable]
    public class InventoryItemData : IId
    {
        [field: SerializeField]
        public string Id { get; set; }
        
        [field: SerializeField]
        public int Quantity { get; set; }

        public InventoryItemData(string id, int quantity)
        {
            Id = id;
            Quantity = quantity;
        }
        
        public ItemData ItemData => InventoryManager.Instance.GetItemDataByIdOrNull(Id);
    }
}