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Added pagination to pure PHP e_tree_model sorting

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Implementation parses db_query parameter and extracts the offset and/or
count from `LIMIT {offset} OFFSET {count}` or syntactically similar

Fixes: #3015
Supersedes: #3016
This commit is contained in:
Deltik
2018-02-03 11:02:28 -06:00
parent 8bfa29d2cc
commit 6d4d7ff688
1 changed files with 43 additions and 0 deletions
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43
e107_handlers/model_class.php
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@@ -3337,6 +3337,9 @@ class e_tree_model extends e_front_model
$sql = e107::getDb($this->getParam('model_class', 'e_model')); $sql = e107::getDb($this->getParam('model_class', 'e_model'));
$this->_total = $sql->total_results = false; $this->_total = $sql->total_results = false;
// Workaround: Parse and modify db_query param for simulated pagination
$this->prepareSimulatedPagination();
if($sql->gen($this->getParam('db_query'), $this->getParam('db_debug') ? true : false)) if($sql->gen($this->getParam('db_query'), $this->getParam('db_debug') ? true : false))
{ {
$rows = self::flatTreeFromArray($sql->rows(), $rows = self::flatTreeFromArray($sql->rows(),
@@ -3344,6 +3347,13 @@ class e_tree_model extends e_front_model
$this->getParam('sort_parent'), $this->getParam('sort_parent'),
$this->getParam('sort_field') $this->getParam('sort_field')
); );
// Simulated pagination
$rows = array_splice($rows,
(int) $this->getParam('db_limit_offset'),
($this->getParam('db_limit_count') ? $this->getParam('db_limit_count') : count($rows))
);
foreach($rows as $tmp) foreach($rows as $tmp)
{ {
$tmp = new $class_name($tmp); $tmp = new $class_name($tmp);
@@ -3492,6 +3502,39 @@ class e_tree_model extends e_front_model
return $this->_total; return $this->_total;
} }
/**
* Workaround: Parse and modify query to prepare for simulation of tree pagination
*
* This is a hack to maintain compatibility of pagination of tree
* models without SQL LIMITs
*
* Implemented out of necessity under
* https://github.com/e107inc/e107/issues/3015
*
* @returns null
*/
private function prepareSimulatedPagination()
{
$db_query = $this->getParam('db_query');
$db_query = preg_replace_callback("/LIMIT ([\d]+)[ ]*(,|OFFSET){0,1}[ ]*([\d]*)/", function($matches)
{
// Offset and count
if (isset($matches[3]))
{
$this->setParam('db_limit_offset', $matches[1]);
$this->setParam('db_limit_count', $matches[3]);
}
// Count only
else
{
$this->setParam('db_limit_count', $matches[1]);
}
return "";
}, $db_query);
$this->setParam('db_query', $db_query);
}
/** /**
* Get single model instance from the collection * Get single model instance from the collection
* @param integer $node_id * @param integer $node_id