/**
* Implements hook_query_node_revision_alter()
*
* Then implement a hook to alter the query
*
* Example from state_flow module
*/
function hook_query_node_revision_alter(QueryAlterableInterface $query)
{
// Get the filter form the session
$filters = $query->getMetaData('filters');
if ($filter = isset($filters['state']) ? $filters['state'] : NULL) {
$query->join('node_revision_states', 'nrs', 'nr.vid = nrs.vid');
$query->condition('nrs.state', $filter);
}
}
/**
* Perform alterations to a structured query for a given tag.
*
* @param $query
* An Query object describing the composite parts of a SQL query.
*
* @see hook_query_alter()
* @see node_query_node_access_alter()
* @see QueryAlterableInterface
* @see SelectQueryInterface
*/
function hook_query_TAG_alter(QueryAlterableInterface $query)
{
// Skip the extra expensive alterations if site has no node access control modules.
if (!node_access_view_all_nodes()) {
// Prevent duplicates records.
$query->distinct();
// The recognized operations are 'view', 'update', 'delete'.
if (!($op = $query->getMetaData('op'))) {
$op = 'view';
}
// Skip the extra joins and conditions for node admins.
if (!user_access('bypass node access')) {
// The node_access table has the access grants for any given node.
$access_alias = $query->join('node_access', 'na', '%alias.nid = n.nid');
$or = db_or();
// If any grant exists for the specified user, then user has access to the node for the specified operation.
foreach (node_access_grants($op, $query->getMetaData('account')) as $realm => $gids) {
foreach ($gids as $gid) {
$or->condition(db_and()->condition($access_alias . '.gid', $gid)->condition($access_alias . '.realm', $realm));
}
}
if (count($or->conditions())) {
$query->condition($or);
}
$query->condition($access_alias . 'grant_' . $op, 1, '>=');
}
}
}
