# Unity SerializeReferenceExtensions

**Inspired by [this post](https://qiita.com/tsukimi_neko/items/7922b2433ed4d8616cce).**

The `SerializeReference` attribute, added in Unity 2019.3, makes it possible to serialize references to interfaces and abstract classes.

The `SubclassSelector` attribute allows you to easily set subclasses of those abstract classes in the Editor that are serialized by `SerializeReference` attribute.

![SubclassSelector](https://user-images.githubusercontent.com/13536348/113597922-5d912500-9677-11eb-8faa-a33dabc60aa3.gif)

#### Features

- Easily set subclass by popup.
- **[New]** Type finding by fuzzy finder.
- **[New]** Override the type name and path by the `AddTypeMenu` attribute.

## 🔰 Usage

```cs
using System;
using UnityEngine;

public class Example : MonoBehaviour {

	// The type that implements ICommand will be displayed in the popup.
	[SerializeReference, SubclassSelector]
	ICommand m_Command;

	// Collection support
	[SerializeReference, SubclassSelector]
	ICommand[] m_Commands = Array.Empty<ICommand>();

	void Start () {
		m_Command?.Execute();

		foreach (ICommand command in m_Commands) {
			command?.Execute();
		}
	}

	// Nested type support
	[Serializable]
	public class NestedCommand : ICommand {
		public void Execute () {
			Debug.Log("Execute NestedCommand");
		}
	}

}

public interface ICommand {
	void Execute ();
}

[Serializable]
public class DebugCommand : ICommand {

	[SerializeField]
	string m_Message;

	public void Execute () {
		Debug.Log(m_Message);
	}
}

[Serializable]
public class InstantiateCommand : ICommand {

	[SerializeField]
	GameObject m_Prefab;

	public void Execute () {
		UnityEngine.Object.Instantiate(m_Prefab,Vector3.zero,Quaternion.identity);
	}
}

// Menu override support
[AddTypeMenu("Example/Add Type Menu Command")]
[Serializable]
public class AddTypeMenuCommand : ICommand {
	public void Execute () {
		Debug.Log("Execute AddTypeMenuCommand");
	}
}
```

#### Supported Types

The `SubclassSelector` attribute supports types that meet the following conditions.

- Class
- Public
- Not abstract
- Not generic
- Not unity object
- Serializable attribute is applied.