Unity Broken text PPtr when saving asset-CodePudding

I recently upgraded my version of Unity 2021.1 and now when I call AssetDatabase.SaveAssets(), I get the error

[Worker0] Broken text PPtr in file(Assets/Game/Dialogue/Dialogue.asset). Local file identifier (1528208011795455128) doesn't exist!

I never had this error in the previous version of Unity. Everything still works but this error does popup in the console on the AseetDatabase.SaveAssets() call. It only occurs when I create a new node for my dialog system.

I added a button to my dialog editor than when clicked it calls AssetDatabase.SaveAssets() and this doesn't throw the error but I don't want this. I want to save whenever I add a new node.

public DialogueNode CreateNode(DialogueNode parent, Vector2 position)
{
    var newNode = MakeNode(parent, position);
    
    Undo.RegisterCreatedObjectUndo(newNode, "Create Dialogue Node");
    Undo.RecordObject(this, "Add Dialogue Node");
    
    AddNode(newNode);
    
    return newNode;
}

private DialogueNode MakeNode(DialogueNode parent, Vector2 position)
{
    DialogueNode newNode = CreateInstance<DialogueNode>();
    newNode.name = Guid.NewGuid().ToString();
    newNode.SetSize(140, 40);
    if (parent != null)
    {
        parent.AddChild(newNode.name);
        newNode.Parent = parent;
        newNode.IsPlayerSpeaking = !parent.IsPlayerSpeaking;
    
        newNode.SetPosition(parent.Rect.position   newNodeOffset, Grid.GridSnapSize);
    
        if (parent.Children.Count > 1)
            parent.SetSize(new Rect(parent.Rect.x, parent.Rect.y, 150, 40));
    }
    else
    {
        newNode.SetPosition(position, Grid.GridSnapSize);
    }
    
    return newNode;
}

private void AddNode(DialogueNode newNode)
{
    newNode.Text = "";
    nodes.Add(newNode);
    OnValidate();
    Save();
}

private void Save() => AssetDatabase.SaveAssets();

public void CreateNew()
{
    if (nameForNew == "")
        return;

    var newItem = ScriptableObject.CreateInstance<T>();
    newItem.name = "New "   typeof(T); //May not need

    if (path == "")
     path = "Assets/";

     AssetDatabase.CreateAsset(newItem, path   "\\"   nameForNew   ".asset");
     AssetDatabase.SaveAssets();

     nameForNew = "";
}

CodePudding user response：

I think you should try to rather explicitly use AssetDatabase.CreateAsset for your new created asset.

Makes more sense than saving all assets across the entire project
your new asset doesn't have any save path yet so where would you expect unity to save it persistently?

You basically are creating and storing only a "virtual" instance of a ScriptableObjec without the according persistent asset ...

So I think what the error means is you are trying to save (= serialize) your base/parent node including the according child node references.

However, since you never create the actual assets these references can not be serialized and are valid only temporary.

CodePudding user response：

After many trial and error attempts and hours of debugging I was able to solve it.

EditorApplication.delayCall  = AssetDatabase.SaveAssets;

Now whenever I call AssetDatabase.SaveAssets() from the Save() function, I no longer get these errors. It appears I have to wait for the inspector to be updated. With this method, the call to AssetDatabase.SaveAssets() will be delayed until the inspector has been refreshed.