Re: [lucy-user] Doc id from hits and remove redundant documents

[Nick Wellnhofer]

On 23/11/2016 15:33, Gupta, Rajiv wrote:
1.       Which field I use to get the document id from hits:
  my $hits = $searcher->hits(
      query      => $query_parsed,
      num_wanted => -1, # -1 equivlent to all results
);
while (my $hits $hits->next()){
                print "Docment id: " . $hit->{???};
}

$hits->next() returns an arrayref of Lucy::Document::HitDocs:

    http://lucy.apache.org/docs/perl/Lucy/Document/HitDoc.html

HitDoc inherits from Lucy::Document::Doc which has a get_doc_id method:

    http://lucy.apache.org/docs/perl/Lucy/Document/Doc.html#get_doc_id

So you can get the doc ID with:

    my $doc_id = $hit->get_doc_id();

2.       While inserting records how can avoid inserting duplicate records.

You have to delete the old documents, using one of the delete_* methods in 
Lucy::Index::Indexer:

    http://lucy.apache.org/docs/perl/Lucy/Index/Indexer.html

Typically, you use one of the fields in your schema as primary key and delete 
documents using delete_by_term:

    $indexer->delete_by_term(my_primary_key => $value);

Nick