Determine a prefab's "type"?

Question

I am trying to create an Editor utility that will let me replace all the prefabs of a certain type in a parent object with a different prefab. The big problem I am running into is that I can't seem to find a way of determining what "type" a prefab is. Here is what I have so far. The problem part is the loop in ReplacePrefabs():

 public class ReplacePrefabEditor : EditorWindow
 {
     Object removalObject;
     Object replacementObject;
 
     void OnGUI()
     {
         EditorGUILayout.BeginVertical();
         removalObject = EditorGUILayout.ObjectField("Removal Object", removalObject, typeof(Object), true, null);
         replacementObject = EditorGUILayout.ObjectField("Replacement Object", replacementObject, typeof(Object), true, null);
         EditorGUILayout.EndVertical();
 
         if (GUILayout.Button("Replace"))
         {
             if (!removalObject || !replacementObject)
             {
                 Debug.LogError("Need to assign objects!");
                 return;
             }
             ReplacePrefabs();
         }
     }
 
     [MenuItem("Prefab Helpers/Replace Prefabs")]
     static void Init()
     {
         ReplacePrefabEditor window = (ReplacePrefabEditor)EditorWindow.GetWindow(typeof(ReplacePrefabEditor));
     }
 
     [MenuItem("Prefab Helpers/Replace Prefabs", true)]
     static bool ValidateSelection()
     {
         return Selection.activeTransform != null;
     }
 
     void ReplacePrefabs()
     {
         Transform root = Selection.activeTransform;
         int childCount = root.childCount;
         for (int i = 0; i < childCount; ++i)
         {
             // determine if the current child is the same prefab type as removalObject
         }
     }
 }

Answer 1

Answer by MarkFinn · Oct 04, 2012 at 06:17 AM

There's probably a better way, but as I need version control on my assets (Check version against server list of current versions) I use a very simple script for this. Just create a version of the script below and apply it to the assets.

 using UnityEngine;
 
 public class Version : MonoBehaviour {
     public string type;
     public int version;
     public string Artist;
     public string Source;
 }

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Answer 2

Answer by JanWosnitza · Oct 04, 2012 at 03:38 PM

This should do it:

 void ReplacePrefabs()
 {
     var root = Selection.activeTransform;
     var childrenToReplace = new List<Transform>();

     // first collect children to replace
     // (don't change a collection while enumerating over it!)
     foreach ( Transform child in root )
     {
         if ( child.gameObject == removalObject )
             childrenToReplace.Add( child );
     }

     // replace children
     foreach ( var childToReplace in childrenToReplace )
     {
         var instance = Object.Instantiate( replacementObject );
         instance.name = childToReplace.name;
 
         Object.DestroyImmediate( childToReplace );
     }
 }

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Determine a prefab's "type"?

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