Determine a prefab's "type"?

Questions & Answers
1

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
        }
    }
}
2

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;
}
3

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 );
    }
}