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ENHANCEMENT Basic highlighting support

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This commit is contained in:
Ingo Schommer 2012-09-03 16:30:05 +02:00
parent 2a3e882d70
commit 78c5daa186
2 changed files with 48 additions and 3 deletions
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19
code/solr/SolrIndex.php
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@ -269,10 +269,23 @@ abstract class SolrIndex extends SearchIndex {
$res = $service->search($q ? implode(' ', $q) : '*:*', $offset, $limit, array('fq' => implode(' ', $fq)), Apache_Solr_Service::METHOD_POST);
$results = new ArrayList();
foreach ($res->response->docs as $doc) {
foreach ($res->response->docs as $doc) {
$result = DataObject::get_by_id($doc->ClassName, $doc->ID);
if($result) $results->push($result);
if($result) {
$results->push($result);
// Add highlighting (optional)
$docId = $doc->_documentid;
if($res->highlighting && $res->highlighting->$docId) {
// TODO Create decorator class for search results rather than adding arbitrary object properties
// TODO Allow specifying highlighted field, and lazy loading
// in case the search API needs another query (similar to SphinxSearchable->buildExcerpt()).
$combinedHighlights = array();
foreach($res->highlighting->$docId as $field => $highlights) {
$combinedHighlights = array_merge($combinedHighlights, $highlights);
}
$result->Excerpt = implode(' ... ', $combinedHighlights);
}
}
}
$ret = array();

32
docs/Solr.md
View File

@ -76,6 +76,38 @@ You can also copy the `thirdparty/`solr directory somewhere else,
just set the path value in `mysite/_config.php` to point to the new location.
And of course run `java -jar start.jar` from the new directory.
### Highlighting
Solr can highlight the searched terms in context of the matched content,
to help users determine the relevancy of results (e.g. in which part of a sentence
the term is used). In order to use this feature, the full content of the
field to be highlighted needs to be stored in the index,
by declaring it through `addStoredField()`.
<?php
class MyIndex extends SolrIndex {
function init() {
$this->addClass('Page');
$this->addAllFulltextFields();
$this->addStoredField('Content');
}
}
To search with highlighting enabled, you need to pass in a custom query parameter.
There's a lot more parameters to tweak results on the [Solr Wiki](http://wiki.apache.org/solr/HighlightingParameters).
$index = new MyIndex();
$query = new SearchQuery();
$query->search('My Term');
$results = $index->search($query, -1, -1, array('hl' => 'true'));
Each result will automatically contain an "Excerpt" property
which you can use in your own results template.
The searched term is highlighted with an `<em>` tag by default.
Note: It is recommended to strip out all HTML tags and convert entities on the indexed content,
to avoid matching HTML attributes, and cluttering highlighted content with unparsed HTML.
## Debugging
### Using the web admin interface