diff options
| -rw-r--r-- | modules/gallery/helpers/item.php | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/modules/gallery/helpers/item.php b/modules/gallery/helpers/item.php index f6181f8a..8098d1cd 100644 --- a/modules/gallery/helpers/item.php +++ b/modules/gallery/helpers/item.php @@ -173,4 +173,34 @@ class item_Core { static function root() { return model_cache::get("item", 1); } + + /** + * Return a random Item_Model, with optional filters + * + * @param array (optional) where tuple + */ + static function random($where=null) { + $random = ((float)mt_rand()) / (float)mt_getrandmax(); + + // Pick a random number and find the item that's got nearest smaller number. In the rare case + // that we chose the smallest number in the system, choose the item with the smallest number. + // This approach works best when the random numbers in the system are roughly evenly + // distributed so this is going to be more efficient with larger data sets. + $random = 0.0; + $items = ORM::factory("item") + ->viewable() + ->where("rand_key", "<", $random) + ->merge_where($where) + ->order_by("rand_key", "DESC") + ->find_all(1); + + if ($items->count() == 0) { + $items = ORM::factory("item") + ->viewable() + ->merge_where($where) + ->order_by("rand_key", "ASC") + ->find_all(1); + } + return $items; + } }
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