How to get the instance of a ScriptableObject

Question

I'm trying to make an Inventory system similar to the one from Skyrim and I have just finished item equipping. I have tried to make it so that if the player tries to equip an item that is already equip it de-euips. I have made that functionality by detecting if the item that is equip is the same as the item you are trying to equip (Using ==) it will de-equip that item. I am using ScriptableObjects with [CreateAssetMenu()] as the base class of my items. This way I have a template for my items and they are all .asset. The downside to this is that all of the items are considered the same, so if I try and equip a different copy of the same equipment .asset it de-equips the item. Is there a way I can save a unique instance id in my item class so I differentiate copies of the same template?

EDIT: Sorry, maybe I was misleading. I mean If I instantiate multiple instances of the same .asset, I need some way to differentiate between those objects, not just between different .assets from the same script.

Answer 1

Best Answer

Answer by Joxev · Mar 05, 2020 at 10:47 PM

Hey, I found this thread

It solved my problem. After I did the solution I could just compare the two objects with an == operator.

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Answer 2

Answer by dannyalgorithmic · Mar 05, 2020 at 10:00 AM

Perhaps you can fetch a get only integer ID using the GetHashCode function using the hash of the asset and class name in the OnValidate magic method as such ...

 public int UniqueID { get; private set; }
 private override void OnValidate()
 {
     int assetNameHash = name.GetHashCode();
     int typeHash = typeof(type).GetHashCode();
     int uniqueID = assetNameHash ^ typeHash;
     if(Mathf.Approximate(this.UniqueID, uniqueID) == false) return;
     UniqueID = uniqueID;
 }

That being said, it won't immediately update when you alter the name of the asset, so you may have to the data to force a validation in order to correct the ID.

Might not be the best solution, but it's a solution.

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Joxev · Mar 05, 2020 at 01:15 PM 1

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I'm not sure that you understand, maybe my title was misleading. If I instantiate multiple instances of the same .asset, I need some way to differentiate between those objects, not just between different .assets from the same script.

Answer 3

You can find instance of ScriptableObject this way:


#if UNITY_EDITOR
        public static ExampleData Load() {
            string[] guids = UnityEditor.AssetDatabase.FindAssets("t:ExampleData");
            if (guids.Length == 0)
            {
                return ScriptableObject.CreateInstance!!
            }
            else
            {
                string path = UnityEditor.AssetDatabase.GUIDToAssetPath(guids[0]);
                return UnityEditor.AssetDatabase.LoadAssetAtPath
  
   (path);
            }
        }
#endif

Editing: "return ScriptableObject.CreateInstance()" is not this before '()' ExampleData in <> same thing LoadAssetAtPath!!(path); But this code works only in Editor because this code is Editor code so it is inside in the '#if UNITY_EDITOR'.

I think you shouldn't use ScriptableObject for this because you can't save the information inside ScriptableObject in the Build. You need to use a save system for this. You can use like this:

public class TPP_DB { static string dataPath;

     public static void Save(System.Object _saveObject)
     {
         if(_saveObject == null) return;

         BinaryFormatter bf = new BinaryFormatter();
         if(dataPath == null)
         {
             GetDirectory();
         }
         FileStream file = null;
         if(!File.Exists(dataPath + "/Save/db.sav"))
         {
             file = File.Create(dataPath + "/Save/db.sav");
         }
         else
         {
             file = File.Open(dataPath + "/Save/db.sav", FileMode.Open);
         }
         if(file != null)
         {
             bf.Serialize(file, _saveObject);
             file.Close();
         }
     }
     public static TPP_Data Load()
     {
         if(dataPath == null)
         {
             GetDirectory();
         }
         if(dataPath != null)
         {
             if(File.Exists(dataPath + "/Save/db.sav"))
             {
                 BinaryFormatter bf = new BinaryFormatter();
                 FileStream file = File.Open(dataPath + "/Save/db.sav", FileMode.Open);
                 TPP_Data loadedData = (TPP_Data)bf.Deserialize(file);
                 file.Close();
                 return loadedData;
             }
             else
             {
                 return null;
             }
         }
         else
         {
             return null;
         }
     }
     static void GetDirectory()
     {
         string[] paths = Directory.GetDirectories(Application.dataPath, "TerrainPathPainter", System.IO.SearchOption.TopDirectoryOnly);
         if(paths.Length > 0)
         {
             dataPath = paths[0];
             dataPath = dataPath.Replace('\\', '/');
             dataPath = dataPath.Substring(dataPath.IndexOf("Assets"));
         }
     }
 }

How to get the instance of a ScriptableObject

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