Hey Tony,

I am sure you have solved this by now, but came across this post while I was working on a similar problem, thought I would share my findings.

You can access the a Lucene document in the OnDocumentWriting overload when you create a custom indexer from BaseUmbracoIndexer

protected override void OnDocumentWriting(DocumentWritingEventArgs docArgs)
{
    var currentNode = _nodeFactoryFacade.GetNode(docArgs.NodeId);

    var categories = currentNode.GetProperty("categories").Value;
    if (!string.IsNullOrEmpty(categories))
    {
        var categoryNodeIdsXml = XElement.Parse(categories);
        var categoryNodeIds = categoryNodeIdsXml.Descendants("nodeId");
        foreach (var categoryNodeId in categoryNodeIds)
        {
            docArgs.Document.Add(new Field("categories", categoryNodeId.Value, Field.Store.YES, Field.Index.ANALYZED));
        }
    }


    base.OnDocumentWriting(docArgs);
}

However the issue is now with searching. When you search you get the same duplicate key exception. I worked around this by concatenating my values, separating them by a pipe (|).

Blogged about my findings if you want any more detail.

http://blog.gravypower.net/examine-indexing-and-searching-with-multypart-properties/

Hope that helps

Guys,

You can inject in into categories space separated list and that can then searched. I do something similar when i want todo path based queries eg all nodes that have parent 1234. Path is stored as csv and not tokenised so i create new field using gatheringnode data then inject in space separated path all works nicely. BTW I did a whole series of blog posts here on examiness over 10 posts covering different hints and tips.

Regards

Ismail

Ismail - I'm using your GatheringNodeData technique to inject the data into the index replacing "," with ", ", however my issue is with the incorrect results being returned.

Given this data:
Blog Entry 1 has categories (array of tags) set to "symptom, something else" 
Blog Entry 2 has categories set to "another symptom, something else"
Blog Entry 3 has categories set to "symptom, something else" 

When searching for:
something else - get 3 results back - Correct 
another symptom - get 1 result back - Correct
symptom - get 3 results back - InCorrect should be only 2 results

I know what is happening and kind of why it is happening but dont know how to fix it - any ideas?  Can I separate with pipes and then include those in the search when I pass in the categories?

Regards,
Matt

Hey Matt,

I would say the issue is that Lucene is doing a text search and is picking up the word "symptom" out of "another symptom" category. I have been adding the id of the node the represents a category this way the name does not affect the search.

There could be an issue when a node ID contains the ID of another category, I would have to have a bit more of a look, but that would solve your issue. Have a look at my blog post above to see what I ended up doing when dealing with categories.

Hope that helps.

Aaron

Thanks Aaron - I we you a beer if you're ever in Seattle :-)

Nice simple solution and also solved my other issues of categories having stop words in them.

Regards,
Matt 

No worries Matt, glad I can help. I find that when I put things into writing I understand them more.

Aaron

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