Hello,

In that case, you will need to manually define a new document alias through which the document should be accessible. If you want to create it automatically, you can take advantage of CustomDataHandler class which allows you to execute custom actions when any data item is created, updated or deleted. You will need to handle updates of cms.documentcategory class, which defines a relation between a document and a category, and create a document alias using the following API (How to create a new document alias using API)

So, please take a look at following code snippet which shows the OnBeforeInsert method of CustomDataHandler and how you to you can get the CategoryInfo object and TreeNode object from cms.documentcategory data class:

public override void OnBeforeInsert(object dataObj, object conn)
{
     // INSERT YOUR CUSTOM BEFORE-INSERT CODE
     SimpleDataClass dataItem = dataObj as SimpleDataClass;
     if (dataItem != null)
     {            
        if (dataItem.ClassName.ToLower() == "cms.documentcategory")
        {
              int documentId = CMS.GlobalHelper.ValidationHelper.GetInteger((dataObj as SimpleDataClass).GetValue("DocumentID"), 0);
              int categoryId = CMS.GlobalHelper.ValidationHelper.GetInteger((dataObj as SimpleDataClass).GetValue("CategoryID"), 0);

              CMS.SiteProvider.CategoryInfo category = CMS.SiteProvider.CategoryInfoProvider.GetCategoryInfo(categoryId);

              CMS.SiteProvider.UserInfo ui = CMS.SiteProvider.UserInfoProvider.GetUserInfo("administrator");
              CMS.TreeEngine.TreeProvider tree = new CMS.TreeEngine.TreeProvider(ui);
              CMS.TreeEngine.TreeNode node = tree.SelectSingleDocument(documentId);
              if (node != null && category != null)
              { 
                    // you can create a new document alias 
                    // the current category name can be accessed using category.CategoryName property
              }
        }
     }
}

For more information about CustomDataHandler, I would like to point you to following sections of Developer's guide: Event handling overview, Custom data handler


Best regards,
Michal Legen