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feature 2384: improve average rating calculation (still need to update language files)

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git-svn-id: http://piwigo.org/svn/trunk@11827 68402e56-0260-453c-a942-63ccdbb3a9ee
This commit is contained in:
rvelices
2011-07-25 18:04:50 +00:00
parent 86bc4d1143
commit 4e4dc79e51
13 changed files with 115 additions and 101 deletions
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include/functions_rate.inc.php
+80 -13
View File
@@ -116,21 +116,88 @@ INSERT
;';
pwg_query($query);
// update of images.average_rate field
return update_rating_score($image_id);
}
/* update images.average_rate field
* we use a bayesian average (http://en.wikipedia.org/wiki/Bayesian_average) with
C = average number of rates per item
m = global average rate (all rates)
* param int $element_id optional, otherwise applies to all
* @return array(average_rate, count) if element_id is specified
*/
function update_rating_score($element_id = false)
{
$query = '
SELECT COUNT(rate) AS count
, ROUND(AVG(rate),2) AS average
SELECT element_id,
COUNT(rate) AS rcount,
SUM(rate) AS rsum
FROM '.RATE_TABLE.'
WHERE element_id = '.$image_id.'
;';
$row = pwg_db_fetch_assoc(pwg_query($query));
$query = '
UPDATE '.IMAGES_TABLE.'
SET average_rate = '.$row['average'].'
WHERE id = '.$image_id.'
;';
pwg_query($query);
return $row;
GROUP by element_id';
$all_rates_count = 0;
$all_rates_avg = 0;
$item_ratecount_avg = 0;
$by_item = array();
$result = pwg_query($query);
while ($row = pwg_db_fetch_assoc($result))
{
$all_rates_count += $row['rcount'];
$all_rates_avg += $row['rsum'];
$by_item[$row['element_id']] = $row;
}
$all_rates_avg /= $all_rates_count;
$item_ratecount_avg = $all_rates_count / count($by_item);
$updates = array();
foreach ($by_item as $id => $rate_summary )
{
$score = ( $item_ratecount_avg * $all_rates_avg + $rate_summary['rsum'] ) / ($item_ratecount_avg + $rate_summary['rcount']);
$score = round($score,2);
if ($id==$element_id)
{
$return = array(
'score' => $score,
'average' => round($rate_summary['rsum'] / $rate_summary['rcount'], 2),
'count' => $rate_summary['rcount'],
);
}
$updates[] = array( 'id'=>$id, 'average_rate'=>$score );
}
mass_updates(
IMAGES_TABLE,
array(
'primary' => array('id'),
'update' => array('average_rate')
),
$updates
);
//set to null all items with no rate
if ( !isset($by_item[$element_id]) )
{
$query='
SELECT id FROM '.IMAGES_TABLE .'
LEFT JOIN '.RATE_TABLE.' ON id=element_id
WHERE element_id IS NULL AND average_rate IS NOT NULL';
$to_update = array_from_query( $query, 'id');
if ( !empty($to_update) )
{
$query='
UPDATE '.IMAGES_TABLE .'
SET average_rate=NULL
WHERE id IN (' . implode(',',$to_update) . ')';
pwg_query($query);
}
}
return isset($return) ? $return : array('score'=>null, 'average'=>null, 'count'=>0 );
}
?>