Get asset path of open prefab

When you edit a prefab in editor mode without opening it (just selecting the prefab in the project), scripts on the prefab can get the prefab path with AssetDatabase.GetAssetPath(gameObject). However, when you open the prefab (by clicking the "Open Prefab" button) AssetDatabase.GetAssetPath returns an empty string.

I tried all the methods in PrefabUtility but not a single one works:

var a = AssetDatabase.GetAssetPath(gameObject); // ""

var b = PrefabUtility.GetPrefabAssetType(gameObject); // NotAPrefab

var c = PrefabUtility.GetPrefabInstanceStatus(gameObject); // NotAPrefab

var d = PrefabUtility.GetCorrespondingObjectFromOriginalSource(gameObject);   // null

var e = PrefabUtility.GetPrefabAssetPathOfNearestInstanceRoot(gameObject); // ""

var f = PrefabUtility.GetNearestPrefabInstanceRoot(gameObject);   // null

var g = PrefabUtility.GetOutermostPrefabInstanceRoot(gameObject); // null

var h = PrefabUtility.GetCorrespondingObjectFromSource(gameObject);   // null

var i = PrefabUtility.GetOutermostPrefabInstanceRoot(gameObject);  // null

var j = PrefabUtility.GetPrefabInstanceHandle(gameObject); // null

var k = PrefabUtility.IsDisconnectedFromPrefabAsset(gameObject); // false

var l = PrefabUtility.IsPartOfAnyPrefab(gameObject); // false

var m = PrefabUtility.IsPartOfImmutablePrefab(gameObject); // false

var n = PrefabUtility.IsOutermostPrefabInstanceRoot(gameObject); // false

var o = PrefabUtility.IsPartOfNonAssetPrefabInstance(gameObject); // false

var p = PrefabUtility.IsPartOfPrefabAsset(gameObject); // false

var q = PrefabUtility.IsPartOfVariantPrefab(gameObject); // false

var r = PrefabUtility.IsPartOfRegularPrefab(gameObject); // false

var s = PrefabUtility.IsPrefabAssetMissing(gameObject); // false

How do you get the asset path of an open prefab?

PS: I'm on Unity 2019.4.2f1

 

Fortunately, a colleague was able to help. You have to call
UnityEditor.Experimental.SceneManagement.PrefabStageUtility.GetCurrentPrefabStage ()?.prefabAssetPath;

 

Save my day

 

What a little legend you are!