CreateAssetMenuAttribute menuName and order constructors

Question

Today I found that you can use the CreateAssetMenu attribute to mark a ScriptableObject as something that should appear in the Create/Asset menu, just like the CreateScriptableObjectAsset from the Unify Wiki. It's great that we have this functionality built in now, but there are some problems:

The attribute places the button at the top of the Create/Asset menu, where Create/Asset/Folder should go, instead of placing at the bottom of the menu.

alt text

The constructor for the attribute does not provide ways to set the menuName, fileName, or order variables, so you cannot change the name of the entry on the Create/Asset menu or the order (which is why it appears on top). Because of this you also cannot nest things in submenus.

The CreateAssetMenuAttribute is also sealed, so it cannot be inherited from to add this functionality.

 public class CreateMenuAttribute : CreateAssetMenuAttribute
 {
     public CreateMenuAttribute(string menuName) : base()
     {
         this.menuName = menuName;
     }
 
     public CreateMenuAttribute(string menuName, int order) : base()
     {
         this.menuName = menuName;
         this.order = order;
     }
 }

 Assets/Scripts/Utility/CreateMenuAttribute.cs(4,14): error CS0509: `CreateMenuAttribute': cannot derive from sealed type `UnityEngine.CreateAssetMenuAttribute'

Is there a way to add this functionality? Can you create a C# attribute that adds and manages another attribute? Doing it with the attribute is much better than having to make a CreateMenu method for every class.

Answer 1

Best Answer

Answer by numberkruncher · Feb 25, 2016 at 04:48 PM

Whilst there is no constructor; attributes with public properties that have a getter and setter can be specified using the named parameter.aspx) syntax that C# offers: Code (csharp):

 [CreateAssetMenu(menuName = "My Name")]
 public class ItemReference : ScriptableObject
 {
     [SerializeField, Multiline]
     private string description;
     [SerializeField, Range(0, 64)]
     private int stackSize;
 }

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Harinezumi · Mar 08, 2018 at 10:46 PM 0

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I would have never figured this out without this answer. Why isn't this documented?

VagabondOfHell Harinezumi · Nov 15, 2018 at 01:40 AM 0

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it is documented. It's part of the .Net language.

https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/named-and-optional-arguments

Harinezumi VagabondOfHell · Nov 15, 2018 at 11:12 AM 0

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OK, you are right, but I meant they should give code example of this on the Unity page. I know, I'm expecting too much...

CreateAssetMenuAttribute menuName and order constructors

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