Finding path(Directory) of Script from class

Hi! This is an old thread, but for anyone who gets on this page, here is a solution.

Since you need an instance of a ScriptableObject, you can create an empty one through code without saving any asset, gets its source script path, and then destroy it.

To test that, create a script TestScriptableObject.cs anywhere in your project, and copy the following code:

 using UnityEngine;
 #if UNITY_EDITOR
 using UnityEditor;
 #endif
 
 [CreateAssetMenu]
 public class TestScriptableObject : ScriptableObject
 {
     #if UNITY_EDITOR
     [MenuItem("Tests/Log TestScriptableObject script path")]
     public static void LogTestScriptableObjectPath()
     {
         // Create the asset instance
         TestScriptableObject tmpInstance = ScriptableObject.CreateInstance<TestScriptableObject>();
         // Get the script asset used by the object
         MonoScript sourceScriptAsset = MonoScript.FromScriptableObject(tmpInstance);
         // Log the script path, using AssetDatabase.GetAssetPath() as you said
         Debug.Log("Path to TestScriptableObject script: " + AssetDatabase.GetAssetPath(sourceScriptAsset));
         // Use DestroyImmediate() to destroy the created asset in edit mode
         DestroyImmediate(tmpInstance);
     }
     #endif
 }

If you click on the new menu Tests > Log TestScriptableObject script path, you will see the path to the source script path in the console window.

I hope I helped :)