Zend_Search_Lucene - How to add filtering to queries?

[j5]

Hello,

Based on the following search index build code I am trying to figure out how
to add "filtering by secondary fields" to a query. I will explain below.


Here is the search index build code.

<?php
// Create search index
$index = Zend_Search_Lucene::create($indexPath);

$articles = getArticles();

foreach($articles as $article) {

// Create new Document
$doc = new Zend_Search_Lucene_Document();

// Index article id
$doc->addField(Zend_Search_Lucene_Field::Keyword('article_id',
$article['id']));

// Index author id
$doc->addField(Zend_Search_Lucene_Field::Keyword('author_id',
$article['author_id']));

// Index category id
$doc->addField(Zend_Search_Lucene_Field::Keyword('category_id',
$article['category_id']));

// Index title
$doc->addField(Zend_Search_Lucene_Field::UnStored('title',
$article['title']));

// Index body
$doc->addField(Zend_Search_Lucene_Field::UnStored('contents',
$article['body']));

// Add document to the index
$index->addDocument($doc);

}

$index->optimize();
$index->commit();



Here is an example of performing a search query.

$terms = "keywords here";
$query = Zend_Search_Lucene_Search_QueryParser::parse($terms);
$hits = $index->find($query);


Based upon the above index build code, how could i "filter" the given search
query code to allow me to add filters to the query.

Filters such as
1) limiting the search query results to a list of author ids
2) limiting the search query results to a list of category ids


Any help on this would be much appreciated. I found the ZF manual confusing
when it comes to building query building.

Thanks!