Custom Inspector for Singleton not working as expected

Unity Engine
1

I’m having some confusion about tying a custom inspector to a singleton-ish script. When I attach the script below to a GameObject, in the inspector I can see and manipulate the prefabList variable. I figure since I can edit prefabList in the default inspector, a PoolManagerEditor’s target will expose the prefabList variable properly, right? Nope!

Sadly, I’m quite stumped. I can’t readily identify what the PoolManagerEditor’s target actually is, likely owing to my confusion about how this singleton-like pattern behaves internally. Can anyone clue me in on how I may access this prefabList var from a custom inspector? A teeny explanation of why it doesn’t “just work” might go a long way, too!

Thanks,

public class PoolManager : MonoBehaviour {
    private static PoolManager s_Instance = null;
    public static PoolManager instance {
        get {
            // if null, find script on object in scene,
            // if still null, create object with script and set to s_Instance
            return s_Instance;
        }
    }       
 
    public List<GameObject> prefabList;    
}
2

Well, I’m guessing the comments in your code are normally replaced with code, right? Otherwise your static variable which is supposed to hold the singleton object is always null.

3

Indeed, that’s all coded. This sample was condensed to the bits essential to illustrating the problem. In the future I’ll clarify any time I do such a thing, as it’s a fair point.

Edit:
I discovered the reason it wasn’t working as expected: A typo in the Editor extension class. Find And Replace In Files is dangerous business. Case closed, many pardons. As a peace offering for anyone who finds this later, I’ll post the bones of this singleton editor.

Singleton class:

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class PoolManager : MonoBehaviour {
    private static PoolManager s_Instance = null;
     public static PoolManager instance {
        get {
            if (s_Instance == null) {
                s_Instance =  FindObjectOfType(typeof (PoolManager)) as PoolManager;
            }           
            if (s_Instance == null) {
                GameObject obj = new GameObject("_PoolManager");
                s_Instance = obj.AddComponent(typeof (PoolManager)) as PoolManager;
            }           
            return s_Instance;
        }
    }  
       
    public List<GameObject> prefabList;    
}

Custom inspector:

using UnityEngine;
using UnityEditor;

[CustomEditor(typeof(PoolManager))]
public class PoolManagerEditor : Editor {
    public override void OnInspectorGUI() {
        PoolManager pm = target as PoolManager;
        EditorGUILayout.HelpBox(pm.prefabList.Count.ToString(), MessageType.Info);
    }
}