How To Delete a Document using indexWriter in LuceneNet

Question

I have this method that I invoke in my controller that have to delete a specific Document. I read in some articles that the best way to delete a Document is using a IndexWriter. But I can't make it work. This is my code

My Index:

    var article1 = new Document();
               article1.Add(new Field("Id", "1", Field.Store.YES, Field.Index.ANALYZED));
               article1.Add(new Field("Author", "Author", Field.Store.YES, Field.Index.ANALYZED));
               article1.Add(new Field("Title", "Title", Field.Store.YES, Field.Index.ANALYZED));

  var directory = FSDirectory.Open(new DirectoryInfo(IndexRoute));
           var analyzar = new StandardAnalyzer(Version.LUCENE_29);

           var writer = new IndexWriter(directory, analyzar, true,  IndexWriter.MaxFieldLength.LIMITED);

           writer.AddDocument(article1);
           writer.Optimize();
           writer.Commit();
           writer.Close();

The method delete:

public void Delete(string id)
{
    var directory = FSDirectory.Open(new DirectoryInfo(IndexRoute));
    var analyzar = new StandardAnalyzer(Version.LUCENE_29);
    var writer = new IndexWriter(directory, analyzar, true, IndexWriter.MaxFieldLength.LIMITED);
    var term = new Term("Id", id);
    writer.DeleteDocuments(term);
    writer.Optimize();
    writer.Commit();
    writer.Close();
}

The method in the controller that invoke the "delete" void:

  public ActionResult Delete()
    {
        _carService.Delete("1");
        return RedirectToAction("Index", "Home");
    }

So I can't find my error,a little help please...

Jf Beaulac · Accepted Answer · 2012-05-04 18:09:57Z

12

When you build your IndexWriter for the delete method like that:

new IndexWriter(directory, analyzar, true, IndexWriter.MaxFieldLength.LIMITED);

You are specifying true for the create parameter, which overwrites the existing index with an empty one, deleting all your documents.

answered May 4, 2012 at 18:09

Jf Beaulac

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1 Comment

John Prado Over a year ago

Sometimes we forgot some details and got stuck with it. I was about to rip off my hair then arrived here. When I looked into my index constructor the "create" param was fixed in true. Thanks for the remind.

buru · Accepted Answer · 2012-05-04 16:05:50Z

4

That's because you're storing you id field as Field.Index.ANALYZED, you should always store id fields as Field.Index.NOT_ANALYZED, so that such fields won't be tokenized and will be stored in the index as is. Same for other fields that you don't want to be changed on indexing.

edited May 4, 2012 at 16:05

answered May 4, 2012 at 5:58

buru

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1 Comment

sisve Over a year ago

+1 for mentioning that keys should not be analyzed. However, the StandardAnalyzer wont mess up basic integer keys, which is used in the question.

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