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MDL-59434 core_search: Alternate result orders including by context

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Implements a mechanism by which search engines can provide different
result orderings, and implements a 'by location' ordering within the
Solr search engine (available whenever the user starts their search
from within a course or activity).
This commit is contained in:
sam marshall 2017-11-23 10:55:07 +00:00
parent b63a3b04b1
commit fc440796e9
9 changed files with 211 additions and 0 deletions
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36
search/engine/solr/classes/engine.php
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@ -65,6 +65,12 @@ class engine extends \core_search\engine {
*/
const HIGHLIGHT_END = '@@HI_E@@';
/** @var float Boost value for matching course in location-ordered searches */
const COURSE_BOOST = 1;
/** @var float Boost value for matching context (in addition to course boost) */
const CONTEXT_BOOST = 0.5;
/**
* @var \SolrClient
*/
@ -370,6 +376,16 @@ class engine extends \core_search\engine {
$query->addFilterQuery('type:'.\core_search\manager::TYPE_TEXT);
}
// If ordering by location, add in boost for the relevant course or context ids.
if (!empty($filters->order) && $filters->order === 'location') {
$coursecontext = $filters->context->get_course_context();
$query->addBoostQuery('courseid', $coursecontext->instanceid, self::COURSE_BOOST);
if ($filters->context->contextlevel !== CONTEXT_COURSE) {
// If it's a block or activity, also add a boost for the specific context id.
$query->addBoostQuery('contextid', $filters->context->id, self::CONTEXT_BOOST);
}
}
return $query;
}
@ -1357,4 +1373,24 @@ class engine extends \core_search\engine {
return true;
}
/**
* Solr supports sort by location within course contexts or below.
*
* @param \context $context Context that the user requested search from
* @return array Array from order name => display text
*/
public function get_supported_orders(\context $context) {
$orders = parent::get_supported_orders($context);
// If not within a course, no other kind of sorting supported.
$coursecontext = $context->get_course_context(false);
if ($coursecontext) {
// Within a course or activity/block, support sort by location.
$orders['location'] = get_string('order_location', 'search',
$context->get_context_name());
}
return $orders;
}
}