Retrieve category hierarchy on keyword save - event system

Question

For one of the requirement, on each keyword save, we need to retrieve the category and the hierarchy of the keywords with corresponding metadata under that category.

The category Id will be used for publishing and hierarchy with metadata will be used for maintaining the details of what data were published as categories and keyword do not have history.

Using webdav url of the keyword, I was able to retrieve category:

Category category = (Category)keyword.Session.GetObject(
    keyword.WebDavUrl.Substring(0,
    keyword.WebDavUrl.LastIndexOf("/"))
);

Is there any other approach available to retrieve the category?

What method can I use to retrieve the hierarchy details?

Answer 1

The two properties you will need to access to retrieve the owning category and parent keywords are OrganizationalItem and ParentKeywords

To get the Category and the recursive list of parent keywords (to any depth) you could use something like the code below

private static void OnKeywordSavePre(Keyword keyword, SaveEventArgs args, EventPhases phase)
{
   //Category object
   var owningCategory = keyword.OrganizationalItem;       
   //IList<Keyword> of parent Keywords, recursively
   var parentKeywords = GetAnchestorKeywords(keyword);
}

private static IList<Keyword> GetAnchestorKeywords(Keyword keyword, IList<Keyword> keywordTrail = null)
{
   if(keyword.ParentKeywords.Any())
   {
      if(keywordTrail==null)
         keywordTrail = new List<Keyword>();


      foreach (var word in keyword.ParentKeywords)
      {
         keywordTrail.Add(word);
         keywordTrail = GetAnchestorKeywords(word, keywordTrail);
      }
   }
   return keywordTrail;
}

*code is example only, and is not production ready