From b6cfd020ba2f03ba32905b704cb5f80201c4d455 Mon Sep 17 00:00:00 2001
From: Pasha <PashaBBibko@gmail.com>
Date: Sat, 24 Jan 2026 18:41:41 +0000
Subject: [PATCH] Added CreateInstanceOnStart attribute

---
 Assets/Pacore/Runtime/ClassAttributeCache.cs  |  4 +--
 .../Runtime/CreateInstanceOnStartLoader.cs    | 33 +++++++++++++++++++
 .../CreateInstanceOnStartLoader.cs.meta       |  3 ++
 .../Attributes/CreateInstanceOnStart.cs       |  8 +++++
 .../Attributes/CreateInstanceOnStart.cs.meta  |  3 ++
 Assets/TestMonoBehaviour.cs                   |  2 +-
 6 files changed, 50 insertions(+), 3 deletions(-)
 create mode 100644 Assets/Pacore/Runtime/CreateInstanceOnStartLoader.cs
 create mode 100644 Assets/Pacore/Runtime/CreateInstanceOnStartLoader.cs.meta
 create mode 100644 Assets/Pacore/Shared/Attributes/CreateInstanceOnStart.cs
 create mode 100644 Assets/Pacore/Shared/Attributes/CreateInstanceOnStart.cs.meta

diff --git a/Assets/Pacore/Runtime/ClassAttributeCache.cs b/Assets/Pacore/Runtime/ClassAttributeCache.cs
index f6fc0df..a444ddc 100644
--- a/Assets/Pacore/Runtime/ClassAttributeCache.cs
+++ b/Assets/Pacore/Runtime/ClassAttributeCache.cs
@@ -13,8 +13,8 @@ namespace PashaBibko.Pacore.Runtime
 
         public static ReadOnlyCollection<Type> GetAttributesOf<T>()
         {
-            return AttributeCache.TryGetValue(typeof(T), out List<Type> attributes) ?
-                attributes.AsReadOnly() :
+            return AttributeCache.TryGetValue(typeof(T), out List<Type> classes) ?
+                classes.AsReadOnly() :
                 throw new ArgumentException($"Attribute [{nameof(T)}] is not used by any classes");
         }
 
diff --git a/Assets/Pacore/Runtime/CreateInstanceOnStartLoader.cs b/Assets/Pacore/Runtime/CreateInstanceOnStartLoader.cs
new file mode 100644
index 0000000..64ecf10
--- /dev/null
+++ b/Assets/Pacore/Runtime/CreateInstanceOnStartLoader.cs
@@ -0,0 +1,33 @@
+using PashaBibko.Pacore.Shared.Attributes;
+using System.Collections.ObjectModel;
+using UnityEngine;
+using System;
+
+using Object = UnityEngine.Object;
+
+namespace PashaBibko.Pacore.Runtime
+{
+    public static class CreateInstanceOnStartLoader
+    {
+        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
+        private static void CreateAllInstances()
+        {
+            /* Fetches all the types with the CreateInstanceOnStart attribute */
+            ReadOnlyCollection<Type> types =
+                ClassAttributeCache.GetAttributesOf<CreateInstanceOnStartAttribute>();
+
+            /* Creates a holder for all the other game objects to not clutter inspector */
+            GameObject holder = new("ScriptSpawnedInstances");
+            Object.DontDestroyOnLoad(holder); // Stops all the game objects from being destroyed
+            
+            Transform parent = holder.transform;
+            
+            /* Creates all the game objects for the selected types */ 
+            foreach (Type type in types)
+            {
+                GameObject go = new(type.Name, type);
+                go.transform.SetParent(parent);
+            }
+        }
+    }
+}
diff --git a/Assets/Pacore/Runtime/CreateInstanceOnStartLoader.cs.meta b/Assets/Pacore/Runtime/CreateInstanceOnStartLoader.cs.meta
new file mode 100644
index 0000000..222bd83
--- /dev/null
+++ b/Assets/Pacore/Runtime/CreateInstanceOnStartLoader.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: cc80f2f5d2d545e2a5776a2c7d86a813
+timeCreated: 1769274499
\ No newline at end of file
diff --git a/Assets/Pacore/Shared/Attributes/CreateInstanceOnStart.cs b/Assets/Pacore/Shared/Attributes/CreateInstanceOnStart.cs
new file mode 100644
index 0000000..4f176c7
--- /dev/null
+++ b/Assets/Pacore/Shared/Attributes/CreateInstanceOnStart.cs
@@ -0,0 +1,8 @@
+using UnityEngine.Scripting;
+using System;
+
+namespace PashaBibko.Pacore.Shared.Attributes
+{
+    [Preserve, AttributeUsage(AttributeTargets.Class)]
+    public class CreateInstanceOnStartAttribute : Attribute { }
+}
diff --git a/Assets/Pacore/Shared/Attributes/CreateInstanceOnStart.cs.meta b/Assets/Pacore/Shared/Attributes/CreateInstanceOnStart.cs.meta
new file mode 100644
index 0000000..77206c8
--- /dev/null
+++ b/Assets/Pacore/Shared/Attributes/CreateInstanceOnStart.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 76e2a7cd34f24a17be15685d89706cd3
+timeCreated: 1769274185
\ No newline at end of file
diff --git a/Assets/TestMonoBehaviour.cs b/Assets/TestMonoBehaviour.cs
index 896eeda..6a51798 100644
--- a/Assets/TestMonoBehaviour.cs
+++ b/Assets/TestMonoBehaviour.cs
@@ -1,7 +1,7 @@
 using PashaBibko.Pacore.Shared.Attributes;
 using UnityEngine;
 
-public class TestMonoBehaviour : MonoBehaviour
+[CreateInstanceOnStart] public class TestMonoBehaviour : MonoBehaviour
 {
     [InspectorReadOnly, SerializeField] private GameObject go;